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Quick Start Guide - The National Center for Computational

1. Breaching Narrow Blockages Break Width in Number of Raster Cells 0 Raw DEM Information File Name d wieiravcchel d testygcw Wdems goodwin_ arc dem File Type Arclnito ASCII File North Coordinate 3797055 South Coordinate 3790995 East Coordinate 240675 West Coordinate 231435 Minimum Elevation 63 0 Masimum Elevation 126 0 Number of Rows 202 Number of Columna 306 Cell Size 30 0 Nodata Value 9999 0 Performing Channel Simulation Now that you have generated the computational channel network you can define model parameters and execute the flow and sediment transport simulation In this section you will learn how to display node numbers in the channel network window how to enter the simulation parameters and boundary conditions how to define the output of the simulation how to run the models and how to inspect and chart the output data Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 48 Displaying Node Numbers CCHEID version 3 0 provides a function that automatically labels each node with its number You will use them later when specifying the output of the flow simulation 1 Make sure the Channel Network 1s active 2 Select the Show Node Numbers option in the Channel Network menu Node numbers should appear by the nodes 3 To remove the node numbers from view use the Hide Node Numbers from the Channel Network menu CCHE1D 3 0 Case gewl d vieiratcchel d te
2. www esri com CCHEI1D does not work with ArcView 8 x or 9 x How to Use This Document This guide assumes CCHEI1D is already installed and working correctly on your computer If you have problems with software installation consult the CCHEI1D User s Manual or contact the program developers for help This guide uses data sets of real watersheds in the United States to illustrate how the model can be used in the simulation of channel flow and sediment transport In the first example GIS data layers are employed to describe a reach of the East Fork River in Wyoming All the necessary are included with the CCHEID software Another example uses the Goodwin Creek Watershed in Mississippi to illustrate a combined watershed channel network simulation in which simulation data from the SWAT watershed model are used as boundary conditions for the simulation of flow and sediment transport in a network of channels These examples should be enough to give a new user a good understanding of the modeling approach adopted by CCHEID as well as to demonstrate its main features and capabilities By following the examples of this guide you should be able to operate CCHEID You should then proceed to the CCHEI1D User s Manual for more detailed explanations for each step of the simulation process Finally you should review the Technical Manual to be able to model channel flow and sediment transport problems correctly Required Engineering Expe
3. 03242 t Watershed Outlet il Efr_cs __loc shp al Channel Reaches Strahler Order 1 Now we will add computational nodes at survey locations 1 Make the Channel Network I window active and zoom in so that the first five or so cross section locations fill the map window 2 Select the Add Node tool Sl Click on the channel line at the position of each cross section to add nodes Use the Pan tool to make other nodes visible and then reactivate the Add Node tool 5 3 Repeat until the 39 interior nodes are added Do not add extra nodes yet because the cross section file supplied for this example matches the nodes of the diagram 4 When finished delete the background by selecting Delete Background from the Channel Network menu Select the theme efr cs loc shp from the list that appears and press OK Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 20 Adjusting Channel Reach Lengths At this stage you could edit the length of each channel reach segment between nodes to correct errors due to distortions in the photograph and inaccuracies inherent to the digitizing and graphical editing In this example however the cross section geometry data contains the distances along the channel between consecutive survey points Therefore it is not necessary to edit them manually Strictly speaking even the position of the nodes added in the previous section could be disregarded You c
4. DEM Note that the options available in the menu change depending on which window is selected When the Processed DEM window is active the Channel Network option becomes available so you can continue the analysis This option is absent from the Raw DEM I window because you cannot extract a channel network without processing the DEM first From the same Raw DEM you can obtain and save different Processed DEMs depending on the parameters you entered By comparing the various Processed DEMs you can determine what is the most appropriate set of parameters Extracting the Channel Network Now that the DEM has been through the pre processing stage you can now extract the channel network To extract the channel network CCHEID calls again the model TOPAZ which uses the concept that water flows along the path of steepest descent or maximum elevation difference You can control the appearance of the channel network minimum channel lengths subwatershed areas and channel density by specifying a set of parameters In this section you will learn how to create this set You must create a set of parameters before you can extract the channel network You can create several sets and CCHEID will store them for you Later when you are going to extract the channel network you can select the set you want to use You can create several channel networks from the same DEM by using different sets of parameters You can also use the same set with several Pro
5. Single Channel 22 choosing which variables should be output at what locations nodes and at which frequencies You can interpret the specification of model output for CCHEID as defining what charts you would like to see when the simulation is complete For that you create the so called Chart Lists For example you can define you want time series for water discharge and water level at given locations but with different frequencies for each location You can decide you want a water surface profile along a certain segment etc Output results are given for Nodes Use the Show Node Numbers option in the Channel Network menu to display node numbers on the channel network view We are going to ask CCHEID to prepare data for 2 charts CCHEID itself does not create the plots but it prepares the data so you can use import it into your favorite plotting package such as Microsoft Excel Tecplot or any program with x y plotting capability 2 CCHE1ID 3 0 Case efri d viewatccheld test elr1 File Edit iew Theme Graphics Cross Section ER Structure Eee Simulation Window Help SLD DeRMZSIL ESSERE EERE EE si Ry aoe F Chart Definition 1 il Hodes Source User Added Waters nee Glues i Channel Reaches Strahler Order 1 m a Chart Data Type x Select data type OF Modal Time Seres Cancel 1 Choose Create Chart List from
6. View Help E simul efrl_md_1 dbf efrl_md_1 shp efrlomd dish Baseflow tst cid_cputst cid ere tet cid _ok tst efl_cidinp tst efi _mp_ df tst efi _mp run SG elr nicon unt tz 4 0 txt 1 object s selected B STKE 4 Alternatively if you have Excel already running you can simply Open the output file select Text Files as file type in the Excel dialog Excel should display the Text Import Wizard Choose Delimited in the first panel Click Next Make sure Tab is select as the delimiter in the next panel Click Finish to complete importing the file Once the file is open you should see a single numeric value in each Excel cell If all contents appear in the first column of the spreadsheet try importing the file again You can now select data to plot and use Excel charting options to quickly create your time series plots l Select columns S m Time and Discharge by clicking on the labels at the top hold the CTRL key to select the second column Click on the Chart Wizard icon in the Excel toolbar or choose Chart from Excel s Insert menu In the dialog that follows select XY Scatter as chart type Choose a subtype and click Next Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 29 4 Edit chart options or press Finish to see your chart Ed Microsoft Excel efrl_mp_rund_ts 40_tst B File Edit Vie
7. at the point shown Row 179 Cok 6 The Extracted Channel Network When the channel extraction finishes CCHEI1D creates two new windows for the watershed you defined Subwatersheds and Extracted Channel Network Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 40 In the Extracted Channel Network window nodes are assigned different types according to their function Source Nodes points where channels begin Inflow Nodes points corresponding to former junctions where a channel was removed because its order was smaller than the minimum specified Strahler Order Junction Nodes points in the channel network where two channels meet Watershed Outlet indicate the location defined as the watershed outlet CCHE1ID 3 0 Case gow d vietratccheld test gcw J File Edt View Theme Graphics Channelletwork Windom Help a Se a AJZ T AACE E X i Seale TSCA 2 Extracted Channel Network 1 Source Int lovs e Junction l Channel Reaches Strahler Order 2 gf Stra hler Order 3 Similarly to the Digitized Channel Network of Chapter 3 the Extracted Channel Network is used as basis for the creation of the computational channel network that will be used in the numerical simulations Creating the Computational Network The Extracted Channel Network is the starting point for the creation of the computational mesh you are going to use in the flow and sediment tr
8. data type that will correspond to the selected node Select Nodal Time Series Chart Data Type Select data type 4 Specify a frequency for output in number of time steps in the dialog that follows lets say every 10 time steps 2 Output Frequency Enter output frequency time steps Bo ooo Cancel Click on two or three other nodes of your choice also selecting Nodal Time Series and providing a frequency Note that you can use different frequencies for every node you specify Now we are going to specify the output of a longitudinal profile Select the Add Profile to Chart List tool 5 to create a new profile dataset Click on the node where you want the profile to start upstream end A large light blue circle marks the initial node Click on a node where you want your profile to end following the channels in the downstream direction Provide a frequency for output lets say every 20 time steps You will note that CCHE1D will mark all nodes that lie in the channel path you have determined You can add more charts to the chart list You can also output a history of cross section geometry and properties related to each size class 1f you include sediment transport in your analysis Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 50 2 CCHE1ID 3 0 Case gow d wieira cchel d test gcw a fo R Theme RX le AR EIS al Channel Hetwork Simulation
9. drainage area required to support a permanent channel The size of this area is a function of soil characteristics vegetation cover climatic conditions and terrain slope You must determine an appropriate value for this parameter For this exercise accept the default value of 7 02 hectares Spatial Distribution Constant Please enter Extraction Parameters OK C54 Critical Source Area PAIE MSCL Min Source Channel Length iE Cancel Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 37 6 Minimum Source Channel Length MSCL You can impose a minimum length for first order channels The numerical processing may create short channels that do not exist in the real channel network or are not of interest for the flow simulations For this example accept the default value of 130 meters and click OK Minimum Strahler Order of channels to remain in the network All reaches in the channel network are classified using the Strahler Order classification You select the minimum channel order to be represented in the modeled channel network Select 2 to eliminate first order channels and click OK Click OK again to dismiss the informational message that appears Minimum Strahler Order E Enter Minimum Strahler Order of Channels to Remain in Hetwork Cancel Extracting the Channel Network Now that you have a set of parameters you can extract the channel network l Make sure the Processed DEM 1
10. in your computer Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 10 Creating the Simulation Domain Digitizing a Channel Network Now we are going to create a computational mesh for the simulation of the 3 3 km reach of the East Fork River We are going to use the Channel Network Digitizing module of CCHEID in which you will draw the channel by following what you see in an aerial photograph To start the Channel Digitizing Module follow these steps 1 Choose the option Digitize Channel Network from the Channel Network menu 2 Inthe dialog that follows choose Yes to import a Background Theme and continue to the next section CCHEID 3 0 Case efri d vieta ccheld test efrl Eile Project MMEren Window Help Import DEM Digitize Channel Network efri apr ka Digitizes a channel network from a reference image JJ Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 11 Importing a Background Image When you decide to import a background theme you are asked to specify what kind of GIS data you are going to use as reference It can be an Image a photograph scanned map etc a Feature theme ArcView Shapefiles a Grid theme ArcView or ArcInfo raster grids or a CAD file If you are not continuing from the previous section choose Import Background from the Channel Network menu io CCHE1D 3 0 Case efri d vietratccheld test efr1 Choose a f
11. menu CCHEI1D will perform a thorough analysis of the input data which may take some minutes You will be able to see the progress of the simulation on a separate window and message will be displayed when the run is complete or when an error occurs Visualizing Results CCHEID does not create any charts or plots but it stores the simulation data in data files that can be easily read by electronic spreadsheets visualization and data analysis programs Please refer to the section Visualizing Results in Chapter 3 of this Guide for information on how to visualize CCHE1D results using popular programs Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 52 Final Words Congratulations You have gone through the main steps of modeling with CCHEID Now it is time to go to the CCHEID User s Manual and learn about other features CCHEID provides because this quick tutorial does not cover all of the CCHEID functionality Remember that CCHEID is a very sophisticated modeling tool that can be used to obtain accurate prediction of flow and channel morphological evolution in a wide range of real life situations However its complexity requires the modeler to understand the physical principles behind the hydrodynamic and morphodynamic modeling The modeler should be aware of all assumptions and simplifications that are present in the model The user must be wary of the fact that it is fairly easy to misuse or abuse the model a
12. of the bed sediment in the watershed Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 44 8 After importing the bed sediment data use the Import option of the Cross Section menu again to import the Bank Sediment File confirming that data are referenced by node numbers in the dialog that follows 9 Select the file Goodwin v3 sk in the same folder and click OK to import the data You will notice that there is a considerable computer processing time that takes place when importing data CCHEI1D is expanding its internal database to store the new data while it performs a series of consistency checks and other tests Adding Hydraulic Structures to the Channel Network Goodwin Creek has a number of 1n stream structures culverts and measuring flumes that substantially affect the flow pattern and the erosion sedimentation processes in the channels We will insert 14 hydraulic structures in our computational network For simplicity data for all structures are stored in a single data file However CCHEID provides a number of facilities that let you add structures interactively on the channel network map Please refer to the User s Manual to learn about the tools available for entering and editing hydraulic structure properties Importing Hydraulic Structure Data To import hydraulic structure data from a data file follow the steps below 1 Make sure the Channel Network 1 is active 2 Select Import fr
13. refer to the CCHEID User s Manual for a detailed discussion on the methods and on the several options CCHEID offers Importing the DEM We start by importing a DEM file from which a channel network will be extracted A DEM stores elevations as raster data that 1s a matrix of equally spaced points with known elevations 1 Select the Import DEM option from the Channel Network menu 2 CCHEID supports different DEM formats For this exercise select Arclinfo ASCII file Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 33 Import DEM Please select the type of the DEM to be imported 4rclnfa ASCII File GAASS ASCII File Raw elevation data no header 3 In the window that appears navigate to the location of the tutorial goodwin directory 4 Select the file Goodwin arc dem and press OK CCHEI1D will read the file and create a view of the DEM The window is named Raw DEM 1 CCHEID 3 0 Case gew d wieira cchel d test gcew File Edit Graphics Dem Window Help sale E Raw DEM 1 ME Es al goo dwin arc dem Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 34 Pre Processing the DEM Now that you have imported the DEM the next step in the analysis is to fix some possible deficiencies of the original DEM to ensure that the analysis algorithms of TOPAZ can extract a complete channel network for this DEM Follow the steps below t
14. sure Remote NCCHE Server is selected Users within the NCCHE computer network should use the option Local NCCHE Server 5 Use the Upload Files button to transfer the input files to the NCCHE server When data transfer is finished use the Start New Simulation button to start the simulation After the remote simulation starts you can close the Data Transfer Utility the CCHEID interface and your connection to the Internet You can check the status of the run at any time by opening the Data Transfer Utility using the Start Data Transfer Utility option in the Simulation menu Do not use the Start Remote Server Run option to check on an existing run Use the Check Progress button to get the current status of the simulation run When the simulation is complete you can request that the simulation results be transferred back to your computer Use the Download Files button to retrieve the output data After you verify the simulation results are safe on your computer you should delete all data files present on the NCCHE server by pressing the Remove Files from Server button Storage space is limited and it is shared by all CCHEID As an act of courtesy please remove the data files from the NCCHE server as soon as possible Visualizing Results Simulation results are always stored inside the simul folder in the current case folder which 1s displayed at the top of the main window Output files are named according to the following
15. the Simulation menu A new theme named Chart Definition 1 is added to the view 2 The tool Add Node to Chart List 5 should be automatically selected This tool allows you to define a chart for a particular node Click on a Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 23 node to select it for example node 40 one upstream of the watershed outlet 3 Select Nodal Time Series as data type in the dialog that follows Enter a frequency in number of time steps Let us say 100 for now we can edit it later 5 Select the tool Add Profile to Chart List Iso that we can define a profile along the channel Click on a node at or near the upstream end let us say node 5 and 35 It should be highlighted in light blue Click on a node at or near the downstream end of the channel Provide a frequency for output let us say 300 time steps The determination of which values that will be output for each type of plot will be done in the next section You can double click on the legend of the Chart Definition theme to choose a different classification for that theme CCHEID 3 0 Case efri d vietra ccheld test etr1 File Edit View ral Graphics Cross Section REISE Structure Channel Hetwork ea Window Help yi gt Se el AIA Ze Es eanan Ee RA e O ss E Chart Definition 1 amp Profile Time Series User Added Watershed Outlet il Channel Reaches Strahler Order 1 Chapter 3 Ex
16. window is selected 2 Select Extract Channels from the Channel Network menu 3 Select the Set of Parameters you have just created and click OK Extraction Parameters Set Choose a Set of Extraction Parameters First Try Default options min order 2 Cancel 4 Confirm the launch of the extraction operation in the dialog that follows CCHEI1D will analyze the DEM and extract the channel network When the Operation completes a new window called Watershed Outlet Selection Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 38 appears so that you can specify the outlet of the watershed you want to analyze Selecting the Watershed Outlet Channels were defined for the entire are of the DEM which covers an area larger than the watershed itself You can see that there are channels that belong to other watersheds at the northwest and southeast corners of the DEM You must now define the location of the outlet of the watershed that will be modeled 1 We want the watershed outlet to be the cell at North Coordinate 3 791 700 and East Coordinate 231 600 There is a measuring flume at that location and we want to use it as the watershed outlet because a discharge stage relationship is well established there which provides an accurate boundary condition at the downstream end of the channel You may want to zoom in on the region of the watershed outlet before selecting the cell Click the Zoo
17. 4 Select the file Eastfork cs in the tutorial efr folder After a couple of seconds while CCHEI1D updates its database a message will be displayed indicating the operation was successful Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 21 2 CCHE1D 3 0 Case efri d viematccheld test efrl File Edt Yiew Tene REAL Eross Section Hydraulic Structure als ea Window Help B17 026 3 4 725 660 05 a Channel Network 1 User Added Watershed Outlet al Channel Reaches Strahler Order 1 2 Cross Section Import Choose type of data to import OF Geometry Cancel Refining the Channel Network After the available cross section data are imported you can refine the computational mesh to improve the quality of the numerical simulations You can use the Add Node ee Add Nodes Sl or Remove Node tools If you add a node CCHE1D will utilize the nearest supplied cross section data to generate interpolated geometry for the new node In this example only flow simulations will be performed Therefore there is no sediment related data to be supplied and the channel network is practically ready for the simulations Performing Channel Simulation Defining Model Output CCHEID does not have a standard output file because there are many combinations that can be used for output The user has the flexibility of Chapter 3 Example 1 Simulation of Unsteady Flow in a
18. CHAPTER 2 Starting CCHE1D Introduction This section describes the basic procedures for starting CCHEID and creating a new test case For version 3 0 however a new automated system has been implemented which allows CCHEID to be started as any Windows program Look for CCHEID in the Windows Start button or click on the CCHEID icon on your desktop if it is available For general information on creating CCHEID test cases understanding CCHE1D ArcView projects managing data files etc please read the sections near the end of Chapter 3 Installing and Starting CCHE1D of the User s Manual for important information For now the basic information to start CCHEID is given here below To Create a New CCHE1D Project To start CCHEID to create a new test case you can start CCHEID like any other windows program 1 Double click on the CCHEID icon on your Windows desktop If you do not see the icon use the Start Menu as usual for any Windows program CCHEID is the Programs NCCHE group On newer versions of Windows the CCHEI1D icon is also available from the task bar usually at the bottom of the desktop 2 You will see ArcView starting and then the CCHEID banner is displayed A new dialog appears Choose Create a new case and press OK Chapter 2 Starting CCHE1D 5 CCHE1D case Please choose 3 You will then be prompted to enter a Project Case Name You can navigate your computer and define a location fo
19. Congratulations you have created a complete computational network to run the CCHEID channel model While using CCHEID you may have created several instances of Processed DEMs Extracted Channel Networks etc To assist you in distinguishing the different windows CCHE1D offers the option Properties always available in the Channel Network menu This option describes the main properties and the history of the selected window For example select the Channel Network I window and select Properties from the Channel Network menu The dialog that appears show the main properties of the channel network and describes how it was created all the way back to the original DEM file Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 47 2 Channel Network 1 Information Channel Network Information Total Number of Modes 196 Total Number of Channel Reaches 154 Origin Extracted Channel Network 1 Network Extraction Information Set of Parameters used for Extraction First Try Default options min order 2 Watershed Outlet Row 179 Watershed Outlet Column 6 Parameter Set Name First Try Default options min order 2 Minimum Strahler Order in Network 2 C54 Critical Source Area Area 1 7 02 MSCL Min Source Channel Length Area 1 130 00 Parameters are Spatially Constant Processed DEM Information Aggregation Resampling No Agregation No Resampling Aggregation Resampling Factor 1 Smoothing Option MO
20. NATIONAL CENTER FOR COMPUTATIONAL HYDROSCIENCE AND ENGINEERING One Dimensional Channel Network Model CCHEID Version 3 0 Quick Start Guide Technical Report No NCCHE TR 2002 03 January 2002 Dalmo A Vieira 2 CCHE1D 3 0 Case efri d vieira ccheld test efr1 Ele Edit F Iheme Graphics Cross Section Hydraulic Structure ChannelNetwork Simulation Window Help Elo Sie AK AAEE SO E w OCIS Sekk S SIRS Scale 1 ser Added e Watershed Outlet pumai Sie Order 1 A Efr_photo sid School of Engineering The University of Mississippi University MS 38677 NATIONAL CENTER FOR COMPUTATIONAL HYDROSCIENCE AND ENGINEERING Technical Report No NCCHE TR 2002 03 One Dimensional Channel Network Model CCHEID Version 3 0 Quick Start Guide Dalmo A Vieira Research Associate Revision Number 27 The University of Mississippi January 2002 Contents CHAPTER 1 Introduction Purpose Applicability Statement How to Use This Document Required Engineering Expertise Related Documents Technical Support and Training CHAPTER 2 Starting CCHE1D Introduction To Create a New CCHE1D Project To Open an Existing CCHE1D Project Final Notes CHAPTER 3 Example 1 Simulation of Unsteady Flow ina Single Channel Introduction O OO N N N Nn O A A A Contents ii Case Description 8 Input Data 9 Creating a New Test Case 9 The Project File 9 Creating the Simulation Domain 10 Digitizing a Channel Netwo
21. Unsteady Flow in a Single Channel 18 9 Use Stop Editing Network in the Channel Network menu Save the changes 10 Choose Validate Channel Network in the Channel Network menu to make CCHEID inspect the digitized channel network Informational messages will be displayed indicating whether the channel network is valid correct or not Creating the Computational Network Once you have completed the channel digitizing you may proceed to create the computational channel network that is define how the simulation domain will be discretized into nodes and elements for the Finite Difference simulations of flow and sediment transport To create a Computational Network based on a digitized channel network simply l Make the Channel Network Digitizing View active choose Create Computational Network from the Channel Network menu A new window appears named Channel Network I Note that when the new window is active the menus buttons and tools change showing new options and tools From now on you will work only on this window You can close the Channel Network Digitizing View To open it again select it from the Channels group EJ of the Project window Adding Computational Nodes The first task will be defining the computational grid for the simulations Grid generation is the most time consuming task of the simulation procedure It requires engineering expertise and understanding of numerical techniques CCHEID provides a series
22. ample 1 Simulation of Unsteady Flow in a Single Channel 24 Defining Run Parameters and Options All run parameters and options are specified through a series of dialogs that are displayed in sequence Please consult the User s Manual for detailed explanations of their meaning For now supply the values when asked according to the table given below Use the Tab key to change fields within the dialog and press the Enter key or the OK button to proceed to the next 1 Select General Parameters from the Simulation menu A sequence of small dialogs will be displayed 2 Provide the values according to the table below Dialog Description Value number l Number of Storm Events to 1 Simulate 5 Time Step Size in minutes 2 Type for Boundary Conditions Time discharge hydrographs File 3 Select the upstream boundary tutorial efr eastfork be conditions file 4 Type of Downstream Boundary User specified stage time series Condition 5 Select the downstream tutorial efr eastfork by boundary conditions file 6 Method for Determination of User specified discharges Baseflow 7 Select the baseflow file tutorial esir castfork oF 8 Select the Flow Modeling Type Dynamic Wave Model 10 11 12 Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 25 Small Depth Treatment Disable small depth algorithm Algorithm Select a Chart Definition Table Chart Definition 1 Select Variables for Time Series Select Water Discharge and S
23. ansport simulations You can create several different computational networks based on a same Extracted Network If later you want to discard a computational Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 41 network simply come back to the Extracted Channel Network window and Start over 1 Make sure the Extracted Channel Network 1 is active 2 Select Create Computational Network from the Channel Network menu 3 A new window appears named Channel Network 1 Adding Cross Section Data From now on all operations will be performed in the Channel Network 1 window You must start providing the data required for the channel flow modeling Let us start by assign properties to nodes in the channel network You will specify cross section geometry and sediment data using the supplied data files CCHEID provides different methods for data input Read Chapter 6 Channel Network Analysis of the CCHEID User s Manual to learn about the methods available CCHE1ID 3 0 Case gow d viea ccheld test gcw a fo i al AIK GAZ a ear IS A 7 Window Help TTL A i p i bene a il ri t mead fg ee j Gitte F ioe eo Junction dl Channel Reaches Strahler Order 2 PS Strahler Order 3 Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 42 Importing a Cross Section Geometry Fil
24. ately Just add a number of points to get the general shape of the channel You may edit it to add detail later l With the Channel Network Digitizing View active choose New Channel Network from the Channel Network menu A new empty theme named Digitized Channels appears Note If you had already created the Digitized Channels theme you can start editing using Start Editing Network from the Channel Network menu If you want to discard the digitized channels use the option Delete Channel Network 2 Maximize the Channel Network Digitizing View and use the Pan and Zoom tools to have the entire simulation reach visible on screen 3 Make sure the Digitized Channels theme is active and that the Digitize Channel tool 3 is selected 2 CCHEID 3 0 Case efri d vietratccheld test efrl j File Edit Miew a a AIR aS Window Help OOS l __ Sa fi Digitized Channels rvi Efr_cs _lo c s hp a 4 Efr_photo sid Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 16 4 The East Fork River flows from south to north Click at the upstream point and then move the mouse over the river visible in the background photograph Click the left button to add points along the river defining its contour Do not stop until you reach the end 5 When the end point is reached double click the left button to terminate the line 6 Choose Stop Editing Network from the Channel Network menu T
25. cessed DEMs This gives you flexibility in creating and comparing various channel networks You can fine tune the appearance of the network by modifying the extraction parameters Creating a Set of Parameters The appearance of channel network and subwatersheds is controlled by several options and parameters you must supply 1 With the Processed DEM 1 window active select the Extraction Parameters option from the Channel Network menu 2 Inthe dialog box that appears select Add a New Set and click OK Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 36 2 Channel Extraction Parameters Do you want to J Add a New Set Cancel These are the options and parameters for each Set 3 You should give the Set of Parameters a name that indicates the case you are evaluating Type a descriptive name for example First try Default options min orde 2 in the dialog box and click OK Parameter Set Name Required Enter a Hame for the Set of Parameters 4 Spatial Variation of Network Extraction Parameters The same extraction parameters can be applied to the entire DEM or up to six groups of parameters can be applied to different regions of the DEM For this example select Spatially Constant and click OK 2 Network Extraction Parameters Network Extraction parameters are Spatially Constant w Cancel 5 Critical Source Area CSA The CSA is the minimum
26. convention Time Series Charts Casename gt mp run lt Number gt ts lt NodeNumber gt txt Profile Charts lt Casename gt mp run lt Numbper gt pri lt NodeNumperus lt NodeNumberDS gt txt Cross Section Geometry Charts lt Casename gt mp run lt Number gt Cs lt NoGgeNumber gt Cxt Sediment Size Class Data Charts lt Casename gt Mp TUN SNUMDeT gt _SZ lt NOGeNUMDer gt LETXE All file are text files and can be opened and edited with any text editor such as Notepad Wordpad or text processors like Word and WordPerfect These files can be imported directly into many electronic spreadsheet plotting and visualization programs Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 28 As an example we are going to show how to open this file into the electronic spreadsheet program Microsoft Excel and plot time series results R In Microsoft Windows use the Windows Explorer to browse your computer to the simu1 folder where the results are stored Locate the Time Series data file named efri mp runl ts 40 txt if you used the suggested names and node numbers Click with the right mouse button and choose the Open With option On Windows 95 98 NT you may have to press the SHIFT key for this option to appear in the menu Choose Microsoft Excel from the list that appears Excel should open displaying the contents of the data file 20 D viera CCHEIDAT esttefri simul File Edit
27. e The cross section data usually comes from information collected from field surveys A data file is provided which contains cross section geometry for all the nodes currently present in the channel network 1 Having the Channel Network I window active select Import from the Cross Section menu 2 In the dialog that follows select Geometry to specify the geometric characteristics of the channel cross sections then click OK 2 Cross Section Import Choose type of data to import UE Bed Sediment Bank Sediment Sediment Class Definition 3 Select by node numbers to indicate that the cross sections in file are numbered according to the computational node numbers F Import Cross Section Data Cross Section Input File by node numbers Cancel 4 For this exercise there is an ASCII file with the cross section data in the tutorial goodwin folder called Goodwin v3 cs Select this file from the dialog box and click OK Importing Bed and Bank Sediment Data Sediment data for Goodwin Creek will be supplied in three data files The first data file defines the sediment size classes that will be used in the sediment transport simulations For the present study nine sediment classes will be used ranging from silt to sand to gravel Bed and bank sediment data Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 43 are given in two separate data files that match the size class de
28. els In this section you will refine the computational network by adding new nodes to the network using CCHE1D s Autogenerate option Using the Autogenerate Function To optimize the Computational Network CCHEID provides the Autogenerate tool CCHEID analyzes the channel network and inserts new computational nodes to the network to improve its characteristics with respect with the requirements imposed by the channel simulation model This option may take several minutes while CCHEI1D analyzes the channel network data adds nodes modifies the database and updates the map layers 1 Make sure the Channel Network 1 is selected and choose Autogenerate from the Channel Network menu 2 Confirm the execution of the procedure in the dialog that follows Wait for a message indicating the autogeneration process is complete Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 46 Adding New Nodes to the Network You can add nodes interactively using the tools provided at the interface When you activate the Add Node tool sl you can simply click on the location you want to add a node and confirm the operation in the dialog that follows Similarly the Add Nodes tool E allows the insertion of several nodes equally spaced at the channel reach on which you click The Delete Node tool allows you to delete nodes added interactively or by the Autogenerate function Getting Information about the Channel Networks
29. er please contact NCCHE for an account and password Internet access is required Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 26 1 Choose Start Remote Server Run from the Simulation menu CCHEID will start the NCCHE s Data Transfer Utility This program performs the following tasks Manages the Internet connection with the NCCHE server and authenticates user Transfers input files from your computer to the NCCHE server Starts the simulation run on the NCCHE server Queries the status of the computer run queued started percentage of completion finished etc Transfers model results output files back to your computer All operations are performed with your explicit consent The CCHE1D interface determines what are the files to be transferred and the Data Transfer Utility will work only with these files To start a new run 1 Make sure you have a live Internet connection 2 Make the Data Transfer Utility window active X NCCHE File Transfer Utility x Select an option to process case data Upload Files Start Hew Simulation Download Files Check Progress Stop Simulation Remove Files From Server Exit Utility 3 Press the Setup Connection button to connect to establish a connection to the NCCHE server Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 27 4 Provide your Username and Password in the dialog that follows Make
30. finition given in the first file The sediment size classes are used to specify the bed and bank sediment composition at different locations of the watershed For each node a percentage of sediment belonging to each sediment size is given Of course it is impossible to have sediment composition measurements for each node Therefore sediment size distribution data are provided at key locations where measurements were available You should now import the three data files that define the sediment data for the Goodwin Creek Watershed 1 With the Channel Network 1 active choose Import in the Cross Section menu 2 In the dialog that follows select Sediment Class Definition for the type of file 2 Cross Section Import Choose type of data to import 3 Browse your computer and go to the tutorial goodwin folder Select the file Goodwin v3 sd and click OK to import the data This file defines the sediment size classes that will be used in the sediment transport calculations 4 After importing the first file use the Import option of the Cross Section menu again to import the next file 5 Select Bed Sediment as data file type Confirm that the input file references locations by node numbers Import Bed Sediment Data Bed Sediment Input File by node numbers Cancel 7 Select the file Goodwin v3 sb in the tutorial goodwin folder and click OK to import the data This file defines the composition
31. he main issue here is to have a single continuous line defining the river contour For now if you accidentally stop before the end point delete the channel line and start over It is possible however to edit channel lines see the User s Manual for more information To delete a digitized line 1 Activate the Pointer tool k 2 Select the line and press the Delete key To quickly verify you have a single line describing the channel use the Open Theme Table tool to open the attribute table corresponding to the Digitized Channels theme You should see a single line with the word Polyline at the first column Adding Details If the channel lengths are going to be inferred directly from your digitized channels it pays to edit the digitized lines so that they represent features like bends and meanders accurately Keep in mind that CCHEID is a one dimensional model and therefore a realistic channel planform may not be necessary provided you specify accurate channel lengths from a survey for example using the editing tools of the interface In this example accurate channel reach lengths will be given as part of the cross section geometry data and this section is for demonstration purposes only Therefore inaccuracies in the channel digitizing will not hinder the quality of the simulation To edit an existing digitized channel l Start editing the Digitized Channels theme Make the Channel Network Digitizi
32. ile type OF Image Cancel r Continue with the following steps 3 Choose Image in the dialog that appears 4 In the dialog that follows you are asked if you want to activate a different ArcView Extension an add on to enable support for a specific data type Answer Yes because we are going to use an image in the Mr Sid format which is requires the activation of an specialized Extension Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 12 Extensions AVvallable Extensions mage arp IMAGINE Image Support Cancel JPEG JFIF Image Support Legend Tool _ _ 2l _ vi a _ MrSID Image Support Reset NITF Image Support M Make Default Projection Utility Wizard About Extends ArcView to support MrSID images v3 2 5 In the dialog that follows click on Mr Sid Image Support Make sure you have a black check mark by the extension name Press OK to continue 6 In the dialog that follows select the background image file Make sure you have Image Data Source in the Data Source Types field at the bottom left corner of the dialog Select the proper drive letter where you have CCHEID installed usually c and then go to the folder NCCHE CCHE1D 3 tutorial efr You should see the file efr photo sid at the left panel of the dialog Double click to select and import that file Import Background Directory cvneche cchel d s tutoralyetr OK efr ph
33. in minutes if you have the point coordinates using standard ArcView functionality Search the ArcView on line manual for Event Theme Tables to learn how to create such map layer 2 CCHE1D 3 0 Case efri d vieira cchel d test efr j File Edt View ie a RIX aA Window Help oe A Rough Sketch On screen digitizing requires a bit of practice and sometimes a good deal of patience However using the available editing tools you can start from a rough sketch and then refine the channel network so that the final result satisfies your requirements for accuracy If you do not have a reference to a real world coordinate system maybe the simple sketch will suffice There are a few rules you must follow when creating channel data using the channel digitizing interface They are discussed in details in the user manual For this example the rules that must be obeyed are 1 The main channel line must be continuous 2 It should be drawn in the direction of flow from upstream to downstream Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 15 For the East Fork River simulation a single channel will be created therefore there should be only one continuous line describing the channel If this is the first time you work with ArcView and CCHEID you may have to repeat steps 3 and 4 to gain some practice with the channel digitizing tool When digitizing do not worry about getting every bend of the river accur
34. ion of Flow and Sediment Transport in a Channel Network 51 3 As boundary conditions type choose Triangular Hydrographs Select the file Goodwin 100 v3 bc and click OK This file contains triangular hydrographs for 100 storm events for each of the 138 subbasins used in a watershed simulation using the model SWAT We are going to simulate only the first five storms 5 Choose Open Downstream Boundary as the type for the boundary condition at the watershed outlet For the method for determination of baseflow choose Automatic Select Dynamic Wave Model as the flow model wave type Press OK in the dialog that follows to Disable small depth algorithm ee ae en Choose Yes to perform the sediment transport analysis 10 Choose a Chart Definition Table from the list displayed next 11 You are now prompted to select the variables that will be saved for all time series charts Select Stage and Water Discharge Press OK to continue 12 Now select the variables that are saved for all longitudinal profile charts Select Stage and Channel Thalweg Elevation Press OK to continue For sediment transport related parameters and options you can use the Advanced Parameters option of the Simulation menu In this example we are going to use the default values so there is no need of any change Starting the Simulation Run To start the channel simulation run simply select the option Start Channel Simulation Local Computer from the Simulation
35. l Planform Having the Channel Network Digitizing View ready with the reference image we must now locate the region of interest Maximize the image size and zoom in at the East Fork River near the northeast corner of the image Use the picture below as reference Another Reference Layer Because you are not familiar with this particular river reach we are going to give you the exact location of the cross section survey points in the simulation domain Suppose a surveyor used a GPS system to locate these particular points and you know the coordinates of these points We are going to import the data into CCHEID and you will have a visual reference to start digitizing the channel reach of interest This step is not really necessary but it is included here to demonstrate the power and versatility of GIS techniques l Having the Channel Network Digitizing View active choose Import Background from the Channel Network menu Select Feature shapefile in the dialog that appears 3 Go to the folder tutorial efr and select the file efr cs _loc shp Make sure Data Source Types is set to Feature Data Source or you will not see the file 4 You can change the order of the layers by moving the bar with the layer name in the legend area to the left of the image in the Channel Network Digitizing View Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 14 A data file as the one you just imported can be created
36. m In button fell and drag a box in the zone of interest CCHE1D 3 0 Case gewl d vieira cchel d test gew File Channel Network Window Help eo iede 1 33225856 T O Watershed Outlet Selection oT 4 al Channel Raster Ce L W eD EINAR Origin 231 187 95 3 791 430 26 Extent 1 991 91 829 09 Area 1 145 643 78 sq 2 Click the Watershed Outlet Selection Tool El 3 Click on the square representing watershed outlet raster cell Remember that the watershed outlet must have coordinates at North 3 791 700 and East 231 600 In the top right corner of the application window you can read the coordinates for the position of the cursor Click on the cell with Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 39 these coordinates as highlighted in yellow in the picture below When you click you should see a message indicating the watershed outlet is located at Row number 179 and Column number 6 CCHE1D 3 0 Case gow d 4vietra ccheld test gcew Eile Channeletwork Window Help ea b04 20 afd 01 2 f 4 In the dialog that appears confirm the operation by pressing OK CCHEI1D will continue the channel extraction process 5 A new window displays the messages generated by TOPAZ Confirm the location of the watershed outlet by typing 1 followed by the Enter key Watershed Outlet Selection Confirm G Do you want to set the watershed outlet
37. mesh define the model output and simulate continuous flow for a period of approximately 30 days Case Description The East Fork River was an experimental river for the study of bed load transport in the 1970 s The study reach is 3 3 km in length and terminates downstream at a bed load trap constructed across the river The drainage area of the East Fork River at the bed load trap is about 500 km During the spring runoff diurnal fluctuations due to snowmelt are characterized by a rising stage during the morning a peak stage at midday and a falling stage during the afternoon In this example CCHEID will be used to simulate continuous flow for about 30 days for which measured data are available Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 9 Input Data All required data files for this exercise are part of the CCHEI1D distribution Data files used in this chapter are located in the folder lt drive letter gt ncche ccheld 3 tutorial efr assuming CCHEI1D has been installed in the default location If you are asked to open or import a certain file make sure to use the file open dialog to navigate to that location Alternatively you may want to copy the contents of that folder to another location of your preference For simplicity the data folders used in this manual will be simply referred as for example tutorial efr instead of the full path name as given above GIS data layers used in this exe
38. nd results may not be accurate or even realistic unless the user is careful in providing sound data and is conscious of the implications behind each option or parameter presented by CCHEID The model developers welcome any question or suggestion and are eager to help you succeed in using the CCHE1D model Please feel free to contact the developers for support with any issue you may encounter The CCHEID research staff is available to help you with through all steps of the modeling process CCHEI1D is a product that is still under development New features are being added and tested so they will be available in future releases If you believe there is any problem with the CCHEID programs or if you think an important feature 1s missing or something must be changed let us know and we will thoughtfully consider your comments and suggestions
39. nd sediment transport through the Goodwin Creek watershed in northern Mississippi using simulation results obtained with the watershed model SWAT In this exercise you will create a channel network using the methods of Landscape Analysis where the drainage network is inferred from elevation data from a Digital Elevation Model DEM You will then create the computational channel network and add channel geometry hydraulic structure and sediment related data Case Description The Goodwin Creek Experimental Watershed was established in 1977 to serve as a prototype of the much larger Demonstration Erosion Control Project DEC watersheds The drainage area above the watershed outlet is 21 3 km Terrain elevation ranges from 71m to 128m above mean sea level producing an average channel slope of 0 004 Most of the channels in the watershed are ephemeral with perennial flows occurring only in the lower reaches of the Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 31 watershed The runoff produced by storm events swiftly exits the watershed and the discharge returns to baseflow levels within one to three days The sediment transported in the channels ranges from silt lt 0 062mm to sand to gravel lt 65mm The watershed is partitioned into 14 nested subbasins by the in stream gauging structures that were built to control channel degradation and to measure discharges stages and sediment yield A compute
40. ng View active choose Start Editing Network from the Channel Network menu 2 Use the Zoom and Pan tools to zoom in to the area you want to edit 3 Select the Vertex Edit tool IE Click on the channel line Each point that defines its shape is marked with a square Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 17 5 To move a point a Move the mouse over the point you want to move The cursor should change to a plus sign b Click and hold the left button Move the point and release the button at the new location 6 To add a point a Move the mouse over the channel line at the location you want to add a point The cursor should change to a encircled plus sign b Click to add a new point 7 To delete a point a Move the mouse over the point you want to move The cursor should change to a plus sign b Press the Delete key to remove the point To undo the deletion press CTRL Z or choose Undo Feature Edit from the Edit menu 8 You can zoom and pan without deactivating the Vertex Edit tool by clicking the right clicking on the map to bring a pop up menu 2 CCHE1ID 3 0 Case efri d vietratccheld test efrl File Edt Miew lt a a AR As Window Help d 2 Ba ve Scale 617 279 09 4724 S1061 T _ Efr_es_loc shp a 4f Efr_photo sid Segment Length 45 99 een 3 329 20 JJ Chapter 3 Example 1 Simulation of
41. o pre process the DEM l Select Preprocess from the DEM menu 2 In the dialogs that follow you can specify some options for the pre 3 processing phase Confirm you want to process the DEM by clicking OK in the first dialog that appears The next dialog refers to Smoothing of the DEM data Select No and click OK if you select Yes the channel network will take a different shape and the input files provided for this example may not match it Elevation Yalues Smoothing G Do you want to smooth the DEM Cancel 4 The next option refers to the Depression Treatment option To extract the channel network the DEM must not exhibit depressions or flat areas Select the option Filling Depressions Entirely and click OK Again if you choose a different option the input data files may not match the resulting channel network Depression Treatment E Treat pits and depressions by Filing Depressions Entirely Cancel Breaching Narrow Blockages 5 CCHEID starts the processing of the DEM A new window named Processed DEM 1 will appear Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 35 With the parameters defined CCHEI1D processes the DEM and produces a new DEM free of flat areas or closed depressions While TOPAZ is running CCHEI1D opens a temporary console window that indicates the program is running When this process finishes a new window opens displaying the Processed
42. of tools that help with tedious tasks of data preparation but it does not replace knowledge and experience in numerical modeling Keep in mind that if the numerical grid is inadequate the model may produce inaccurate results or may not even converge to a solution We will define the same number of cross sections that are available from a field survey or 41 nodes The exact relative position for each node is given together with the cross section geometry in the file eastfork cs The channel network already contains two nodes a Source node at the upstream end and the Watershed Outlet node at the other end We must now add the remaining 39 nodes For that we will make use of a sketch produced by the surveyors which was scanned and georeferenced to the same coordinate system of the aerial photograph used as reference Let us add the reference layer Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 19 l Make the Channel Network 1 active and use the option Import Background from the Channel Network menu In the dialog that appears select Feature Shapefile 3 Browse your computer and select the file efr cs loc shp in the tutorial efr folder CCHE1ID 3 0 Case efrl d vieira ccheld test efr1 a ico Se al AIK ap zak Paka ac SIG a Window Help taut IEI MR ol JT o EJET f a Os Hetwork 1 EJE 79 4 4 25
43. om the Hydraulic Structure menu to import a data file 3 Browse your computer and go to the tutorial goodwin folder Select the file Goodwin v3 st and click OK to import the data This file defines the four culverts and ten measuring flumes present in the channels of the Goodwin Creek watershed You will see a message informing that one of the structures a measuring flume is located at the watershed outlet and that the model will use the flow rating curve for this structure when defining the boundary conditions for the watershed outlet Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 45 CCHE1D 3 0 Case gow d wieira cchel d test gcw File Edit iew Theme Graphics Cross Section Hydraulic Structure Channel ietwork Simulation Window Help m Kea AS ZA RSL z lL z Bel Junction Culvert Wheasuring Flume dl Channel Reaches Strahler Order 2 ANA Stra hler Order 3 Refining the Computational Network The numerical computation of flow and sediment routing through a channel network requires a well defined set of computational nodes A channel network as extracted from a DEM has very few nodes Furthermore their spatial distribution makes the resulting network inadequate for numerical simulations CCHEI1D has an algorithm that inspects the channel network and adds nodes automatically This will significantly improve the accuracy and stability of the numerical schemes employed by the channel mod
44. oto sid fee c Co neche gt ccheld 3 tutorial Directories C Libraries Data Source Types Drives Image Data Source C 7 In the dialog that follows you will be asked if you want to start digitizing a channel network Answer No Chapter 3 Example 1 Simulation of Unsteady Flow in a Single Channel 13 8 Make the theme visible by clicking on the small square on its legend to the left of the image area By now you should see a new window entitled Channel Network Digitizing View 1 In this window you will digitize the channel s visible on your reference theme in this case a Digital Orthophoto converted to the MrSid file format You can use the zoom and pan tools to see the detail of the image About the Coordinate System The photograph you imported was already referenced to a known coordinate system That is why you can see real coordinate values at the top right corner of the CCHEID interface If you intend to use an image that is not already referenced to a known coordinate system you can use the CCHEID Image Georeference Extension which allows you to provide the necessary data for establishing the relationship between features in the image and points of known coordinates Once the image is georeferenced CCHEID can use real distances when creating the input data for the model If the image is not referenced all coordinates will be approximately between 0 0 and 1 0 Digitizing the Channe
45. ould have the mesh as a simple sketch having all nodes equally spaced within the domain because the real distances are given inside the cross section geometry file Furthermore when you adjust channel reach lengths the channel network map is not modified If you add a node to a reach with an user defined length the new lengths will be compute ed using the relative position of the new node and the user defined reach length Consult the CCHEID User s Manual for other mesh editing capabilities Supplying Cross Section Data Now that the basic channel network has been defined we must provide the channel geometry for the computational nodes For the simulation channel geometry must be defined at each node However in practical cases data are rarely available at this level of detail CCHEID requires known geometry only at the beginning and end of channels and it can use linear interpolation to generate data for nodes without data Of course providing data for only two points would be a crude approximation The cross section geometry file provided for this example contains real survey data for all nodes The data also includes values Manning s roughness coefficient n To import the cross section data 1 With the Channel Network I active select Import from the Cross Section menu 2 Select Geometry in the dialog that follows then press OK to continue 3 Press OK to confirm that input file reference locations by node numbers
46. putational Hydroscience and Engineering Dalmo A Viera amp Weiming Wu ALPHA version internal testing If there is already an open ArcView project the CCHEI1D banner is displayed and you are prompted to enter a Project Case Name You can navigate your computer and define a location for the new CCHEI1D project if desired Otherwise simply provide a short case name not more than eight characters and press OK If there is no open project use the New Project option of the File menu The CCHEID banner is displayed and you are prompted to enter a Project Case Name You can navigate your computer and define a location for the new CCHEID project if desired Otherwise simply provide a short case name not more than eight characters and press OK Save the new ArcView project as usual To Open an Existing CCHE1D Project There are three different ways of opening an existing CCHE1D ArcView project l You can open an existing CCHE1D project simply by double clicking the ArcView Project file icon The ArcView file has extension apr and is located inside the folder with the same name without the extension On Windows systems the icon also appears in the Documents or Recent Documents part of the Windows Start menu Alternatively you can start ArcView and then use the Open Project option of the File menu Chapter 2 Starting CCHE1D 7 3 You can start CCHEID directly using the CCHEID 3 0 icon on your desk
47. r based acquisition system collects and transmits data from the gauging stations to the USDA ARS National Sedimentation Laboratory in Oxford MS which is responsible for the monitoring program Periodic channel surveys bed and bank sediment sampling a rain gauge network and a detailed inventory of upland soil types and land use complement a dataset that provides an excellent means to verify upland and channel flow and sediment transport models Input Data All required data files for this exercise are part of the CCHE1D distribution Data files used in this chapter are located in the folder lt drive letter gt ncche ccheld 3 tutorial goodwin which from now on is referred simply as tutorial goodwin If you are asked to open or import a certain file make sure to use the file open dialog to navigate to that location Alternatively you may want to copy the contents of that folder to another location of your preference All input data used in this exercise were prepared by or obtained through the USDA ARS National Sedimentation Laboratory in Oxford MS which is responsible for monitoring the Goodwin Creek Watershed and was actively involved in cooperative research for the development and application of modeling tools as part of the Demonstration Erosion Control Project Watershed modeling work using SWAT was performed and provided by Dr Ronald L Bingner of that institution Creating a New Test Case In order to start working
48. r the new CCHEI1D project using the right hand side panel of the dialog Otherwise simply provide a case name but limit it to eight characters and do not use spaces or special symbols lt amp 2 Enter new CCHE1D case name 8 chars max lowercase File Mame Directones redcreek do Wwieraycochel ds test gt dA vieira k gt ccheld C eastfork C efr ai a efr Drives j If you prefer to start ArcView first or if you already have ArcView running you can start CCHE1D by enabling its Extension 1 In ArcView s File menu select Extensions You must have ArcView s main window the Project window active to see this option 2 Scroll down the list of extensions available on your computer and select CCHEID A black checkmark appears Press the OK button If you cannot see the CCHEID extension in the list the software was not installed correctly Make sure the extension file ccheld 3 avx 1s installed in the proper directory Je 5 Chapter 2 Starting CCHE1D 6 Extensions AVvallable Extensions Basin CADAG Image Support Cancel Cad Reader CCHE1D 3 0 Channel Network Mode CCHEID 2 0 Channel Network Mode Reset CCHE1D Image Georeferencing Tool M Make Default CIB Image Support m _ _ v _ ai _ About Extends ArcView to support channel network flow modeling using CCHE1D v3 0 build 011218 Natonal Center for Com
49. rcise were obtained from the Wyoming Spatial Data Clearinghouse http wgiac state wy us wsdc Creating a New Test Case In order to start working with CCHEID let us start the CCHEID ArcView interface and create a new test case for the East Fork River data l Start CCHEID Either click on CCHE1D 3 0 in the Windows Start Menu or click on the CCHEI1D 3 0 icon on your desktop or task bar 2 A dialog will appear asking for a Case Name Enter a short alphanumeric name like efr1 but limit it to eight characters and do not use spaces or special symbols lt amp Z Note that the simulation data will be written to the location shown in that dialog You can navigate to another folder if you like it Chapter 3 of the User s Manual discusses how you can define the default location for your CCHEID cases 3 Press OK when done Note that a new folder with the same name you gave to the Test Case was created at the specified location All data files created by CCHEI1D will be stored inside that folder The Project File Inside the recently created folder there is a file with the same Case name but with extension apr This file is the ArcView Project File It stores the current state of your CCHEID project To open an existing case simply double click on the apr file The project file does not store the data elements for the maps tables model input and output etc but only references to other files present
50. rk 10 Importing a Background Image 11 Digitizing the Channel Planform 13 Creating the Computational Network 18 Adding Computational Nodes 18 Adjusting Channel Reach Lengths 20 Supplying Cross Section Data 20 Refining the Channel Network 21 Performing Channel Simulation 21 Defining Model Output 21 Defining Run Parameters and Options 24 Executing the Channel Simulation 25 Visualizing Results 27 CHAPTER 4 Example 2 Simulation of Flow and Sediment Transport in a Channel Network 30 Introduction 30 Case Description 30 Input Data 31 Creating a New Test Case 31 Creating the Simulation Domain 32 Extracting a Channel Network from a DEM 32 Importing the DEM 32 Pre Processing the DEM 34 Contents Extracting the Channel Network Creating the Computational Network Adding Cross Section Data Adding Hydraulic Structures to the Channel Network Refining the Computational Network Performing Channel Simulation Displaying Node Numbers Defining Model Output Creating a Chart List 35 40 41 44 45 47 48 48 49 Specifying Simulation Parameters and Boundary Conditions 50 Starting the Simulation Run Visualizing Results Final Words 51 51 52 CHAPTER 1 Introduction Purpose This Quick Start Guide is intended to help new users become familiar with CCHEID by providing step by step instructions for example applications that demonstrate the use of the modeling components and auxiliary tools This manual adopts a hand
51. rtise The use of CCHEI1D requires a certain level of expertise from the part of the user In fact the user of this program 1s the real modeler who must describe a physical domain in such a way that a numerical solution of the flow and sediment transport equations is stable and accurate Before applying the model to the study of any flood and or transport study one must read the CCHEID Technical Manual carefully to understand how CCHEI1D models the physical phenomena and especially to become familiar with the assumptions and limitations that are present in the model Although the CCHEID model has been considerably improved in order to handle a large variety of flow conditions that typically occur in nature there could be Chapter 1 Introduction 3 situations where the underlying hypotheses of the model were not satisfied and the model could yield inaccurate or even erroneous results It is responsibility of the user to employ this sophisticated tool in a reasonable scientifically sound way The CCHEID interface certainly facilitates the use of the model but engineering sense 1s still required Related Documents The documentation of CCHEID is separated into several publications designed to fulfill the needs of different audiences The present document the CCHEID Quick Start Guide is intended primarily to users who will use CCHEI1D for the first time and therefore are not familiar with program For detailed instructions on ho
52. s on approach where you learn by following examples instead of combing through the thick User s and Technical Manuals This guide gives emphasis to the use of the software through the ArcView graphical interface especially to the process of data preparation Two main examples are described in this guide which demonstrate how CCHEID can be used to model practical engineering problems This guide does not show all the capabilities of the CCHEID software nor it describes in detail the functionality of each tool or feature For a complete description of the programs data structures etc please consult the CCHEID User s Manual In addition before using the CCHEID model you should have a good understanding of the assumptions and methodologies employed in the model For detailed information on the theoretical background of the models implementation procedures program structure etc please refer to the CCHEI1D Technical manual and publications listed in the References sections of the User s and Technical Manuals as well as publications listed in the CCHEI1D website at http www ncche olemiss edu ccheld Chapter 1 Introduction 2 Applicability Statement This guide applies to CCHEID version 3 0 It updates and supersedes any previous version of this manual CCHEI1D 3 0 requires ArcView GIS version 3 0a 3 3 Please install update patches for ArcView 3 x available from the Environmental Systems Research Institute at http
53. st gcw H fo i Tal AIX ie ak EIKI Structure MaG Simulation Window Help Properties Edit Selected leanne Reach Hide Node Numbers alae ate toin cn caer ee al ae pt Autogenerate m Source Inf lows 146 Junction 1 Auto Added 122e 4n Culvert 139 g5 Measuring Flume yi Channel Reaches 132 107 103 02 F Strahler Order 2 a3 fA Strahler Order 3 p00 segap3 54 13 a oe Defining Model Output The simulation models generate a huge amount of time dependent data which makes it impossible to store data for many computational nodes and at many times Therefore before you start the simulation you must specify what type of data you want for which nodes and at which time frequency CCHEID makes the task easier by relating what is going to be saved to the description of the charts you would like to see when the simulation is complete You will now create a list of these charts Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 49 Creating a Chart List l Make sure the Channel Network is selected and then choose the Create Chart List from the Simulation menu A new theme will appear entitled Chart Definition 1 Select the Add Node to Chart List tool a to activate it Lets select a couple of nodes for which we will plot time series of some flow variables Click on a node near the watershed outlet You will be prompted to select a
54. tage Output Press and hold the SHIFT key for multiple selections Select Variables for Profile Select Stage Output Executing the Channel Simulation Once the General Parameters are set you can start the CCHE1D channel flow model for the simulation A simulation can be executed on the same computer the interface is running the preferred option or on the NCCHE server which is available free of charge Running the model on the local computer 1 Choose Start Channel Simulation Local Computer from the Simulation menu CCHEI1D will perform a series of checks on its database which may take several minutes if there are many recent changes to the mesh or cross section data After the initial checking is complete the interface will transfer all the data to the simulation module A series of informational messages are displayed Each time a simulation is started a new run number is assigned This way results from a previous simulation are not overwritten and remain on your computer hard disk Although the interface attempts to detect errors in the input files some problems in the input data may be detected only when the simulation takes place Error messages issued by the model are also displayed on the graphical interface The following section shows how to access the simulation results Running the model on the NCCHE Server optional NCCHE provides a computer server free of charge for registered users To use the serv
55. top on in the Windows Start menu Choose Open existing case in the dialog that follows Final Notes CCHEI1D cannot work unless you provide the case name If you cancel the creation of the test case the project is closed but the extension remains active Simply use the New Project option to create a new CCHEID Project Once a case name is defined CCHEID creates a directory with the same Case Name at specified location It is very important to always save the ArcView project If you are already familiar with ArcView you know that ArcView project files extension apr do not store the data such as tables graphics etc but only references to other files in the computer system If you forget to save the project file references to the files may be lost Read the instructions and usage guidelines of the User s Manual especially Chapter 3 where important tips are given for the general use of CCHEID If you are not familiar with ArcView it is recommended that you spend one hour or so familiarizing yourself with that program to understand how it works CHAPTER 3 Example 1 Simulation of Unsteady Flow in a Single Channel Introduction This chapter will use data for the East Fork River in Wyoming USA to illustrate how CCHEID can be used to simulate unsteady flow in a natural river In this example you will define simulation domain using GIS data and the Channel Network Digitizing module You will prepare the computational
56. w Insert Format Tools Data Window Help D we ESR see oA es hl PGT Discharge A B e D ad Hydrograph Time Step Sir Time Sim Time Acc Date Hour Discharge 0 0 0 0 0 0 1 65 5 79256 1 100 30000 30000 19790620 6 333336 11 3639 6 04546 1 200 eooo e0000 19790520 16 666647 10 6275 6 01702 1 300 S000 SOO00 197906521 1 000036 17 3159 6 06529 1 400 120000 120000 19790521 9 33337 eee 6 17516 Flow Discharge Ba Ba fe Do Mo hm co on Discharge m3 s 15 10 J 0 S00 00 1000 00 1500 00 2000 00 2O00 00 S000 00 Time sec Pa _ Thousands a Bb SILI KHAU 7a a bbb n Boi A 2400 z 20000 720000 19790528 6 000296 29 7415 6 63693 MAF H efri mp runi ts 40 Ja eee gt l Ready Sum i42575599 8 NM p This short example demonstrated how to quickly prepare the input data for an unsteady flow simulation in a single channel It also showed the basic procedures for defining the type of output and performing the channel simulations Please refer to the User s Manual to learn about all the options and capabilities the CCHE1D software has to offer and to learn how to prepare the data files that were provided for this exercise CHAPTER 4 Example 2 Simulation of Flow and Sediment Transport ina Channel Network Introduction This chapter will teach you how to perform a simple channel flow analysis for a complete watershed analysis using CCHE1D You will simulate the runoff a
57. w to use CCHEI1D and for documentation on input files etc read the report One Dimensional Channel Network Model CCHEID Technical Manual For a more technical discussion of the CCHEI1D Channel Network Model and for guidance on the modeling of flow and sediment transport in channels please consult the One Dimensional Channel Network Model CCHE1D Technical Manual In addition the CCHEID web site http www ncche olemiss edu ccheld lists a series of publications that discuss the development testing and application of the model Technical Support and Training The model development staff is available to answer any questions concerning the software and its application in the modeling of engineering problems If you have any questions or need more information about model capabilities and limitations model assumptions methods and techniques or any other technical issue please feel free to contact the NCCHE Consult the NCCHE web site for current contact information There is no charge for this service The NCCHE may be able to arrange training sessions or technical consulting tailored to your particular type of problem or application If the current version of CCHEI1D does not offer a particular feature or capability required for your intended application arrangements can be made to enhance the current software depending on the model s development time table and provided a cost sharing agreement can be reached
58. window Help 2 Channel Network 1 W Chart Definition 4 Cross Section Profile amp Sediment Properties Time Series dl Hodes Source Inf lou Junction Auto Added Culvert Measuring Flume dl Channel Reaches Strahler Order f f Stra hler Order 3 Specifying Simulation Parameters and Boundary Conditions In this section we will specify the options to perform a channel simulation that includes sediment transport and channel morphological changes We are going to simulate a series of storm events using the output of a watershed model simulation as boundary conditions for the channel simulation Results computed with the watershed model SWAT provide daily runoff and sediment loads for each subwatershed defined in the Landscape Analysis phase The runoff is converted into a series of triangular hydrographs one for each subwatershed for each storm event whose properties are given in a data file You will now provide the main parameters and options for your first simulation of Goodwin Creek For each dialog that appears select according to the instructions below 1 Select the option General Parameters from the Simulation Menu 2 CCHEID pops up a dialog requesting basic information for the simulation you will perform The first dialog contains two options Number of Storms to Simulate Time Step Size in minutes Enter 5 as the number of storm events and 10 minutes as time step size Chapter 4 Simulat
59. with CCHEID let us start the CCHEID ArcView interface and create a new test case for the East Fork River data l Start CCHEID Either click on CCHE1D 3 0 in the Windows Start Menu or click on the CCHEI1D 3 0 icon on your desktop or task bar 2 A dialog will appear asking for a Case Name Enter a short alphanumeric name like gcw1 but limit it to eight characters and do not use spaces or special symbols lt amp Note that the simulation data will be written to the location shown in that dialog You can navigate to another folder if you like it Chapter 3 of the User s Chapter 4 Simulation of Flow and Sediment Transport in a Channel Network 32 Manual discusses how you can define the default location for your CCHEID cases 3 Press OK when done Note that a new folder with the same name you gave to the Test Case was created at the specified location All data files created by CCHEI1D will be stored inside that folder You can save your project at any time by selecting the Save option from the File menu or by clicking the button Creating the Simulation Domain Extracting a Channel Network from a DEM In this example we are going to create a channel network using an automated procedure referred to as Landscape Analysis in which a program called TOPAZ TOpographic PArameteriZation is used to analyze elevation data and define the drainage network and delineate the drainage basin Please

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