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Quick Start Guide - The National Center for Computational

1. dary Cond 55555555 555505265065 55555555555 Boundary Flow Options 54559 0 4 SAN Total discharge m s Se QW Discharge hydrograph SF SSS S SY Inflow angle degrees fo AWN Set Flow Parameters Delete Flow Cancel 555 SOS 555555555 555555565 XX SC 4 qe av ae ECL Figure 3 12 o InInlet Boundary Conditions dialog Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport gt In page Sediment click Import File in the group Sediment and in Open a Bedload Sediment File dialog choose vistula bbe and then click Open gt Click Import BC File in the group Suspended Sediment and in Open Suspended Sediment File dialog choose vistula sbc and then click Open gt Click OK to save the inlet boundary conditions Inlet Boundary Conditions xX Fla Sediment Bedload Sediment Create BL File Import BC File Documents and Suspended Sediment Create BC File Import BC File Documents and Set Sediment Parameters Delete Sediment BC Apply Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 38 Open a Bedload Sediment File 2 Look in Cy Vistula
2. 3 2 Du IO DUCTION 3 DD OPIN 3 2 9 SET TIEOW INIDIAL C ONDEFIONS cames de SAC LS UR 5 2 SET PLOW PARA MBE DPRS 5211 tesi ais noi icu EE 10 2 5 SET INLET AND OUTLET BOUNDARY CONDITIONS 0 100000000000 000000000 13 2 ee eee ee 17 2 4 VISUALIZE FLOW RESULTS a 18 3 EXAMPLE 2 STEADY FLOW SIMULATION WITH SEDIMENT TRANSPORT 25 S ODO 25 OFOP ILE eO LARA CA IM TE 29 PARAMETERS Coda ede ach 27 3 4 SEDIMENT PARAMETERS ccceccsceccscecescecscsceccececescecescecscscesesceceececescecesescesescesescecasees 27 3 5 SET SEDIMENT BOUNDARY CONDITIONS cceccsceccececcececcccecscececcececescecescscescscesescecescecesees 30 3 6 SET INLET AND OUTLET BOUNDARY CONDITIONS cccececcececcececcececcsceccscecscscesescecescecesens 36 S SET BED MATERIAL SAMPLES 38 BED PROPERTIES 2
3. EEE File vistula bbe Files of type Bedload Sediment Files bbe LE Open a Suspended Sediment File 2 Look in Cy Vistula Fi File Vistula sbe Files of type Suspended Sediment Files 26 2 Figure 3 13 3 7 Set Bed Material Samples The bed material samples will be used to define the initial bed material compositions in both horizontal and vertical directions for the entire domain The information of the bed material samples are contained in a file with the extension bmt You may create as many samples as necessary In this example however we assume the same sediment size distribution throughout the domain e First select Set Bed Material Samples in menu Simulation to activate Define Bed Material Samples dialog window Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 39 Define Bed Material Samples nS eS eae a a Figure 3 14 In Define Bed Material Samples dialog o Click Add Sample to create a new template of a sample which has the uniform size distribution and the default porosity of 0 24 Define Bed Material Samples 1 Sample Ma E F Class P 56 005 0 0001 0 00015 0 00025 142857 0 142857 0 142657 0 142857 0 Porosity c 24 c Figure 3 15 Chapter 3 E
4. 6 Initial water surface level Roughness Specily initial water surface Make sure the value is higher Bed elevation than bed elevation Whole Domain Define Distribution C Assign new ID to nodes Select a region by clicking on two different nodes nterpolate initial water surface level Identify region by selecting two nodes Undo Undo All Exit Figure 2 3 Click Define Distribution again and then select two points along the first mesh J line In Assign Value dialog enter value 11 6 and click OK Chapter 2 Example 1 Steady Flow Simulation 7 Specify initial water surface Make sure the value is higher than bed elevation Nodal Prop x Keep current flood min and max values Assign WSL Roughness or Bed Elevation nitial water surface level C Roughness OK Cancel Bed elevation Whole Domain Define Distribution Assign new ID to nodes Select a region by clicking on two different nodes C nterpolate initial water surface level Identify a region by selecting two nodes Undo Undo All Exit Figure 2 4 Select the option Interpolate initial water surface level and then click two different points to cover the whole domain In dialog Initial Water Level Interpolation choose Interpolate along constant I lines and then click OK The initial water surface level
5. is loaded You select flow variables from variable selector on the main toolbar gt Gy 9 Bed Elevation Water Surface Level LI Velacity Component V Valacity Component Velocity Magnitude Specific Discharge G campanarnt Specific Discharge Specific Discharge Magnitude Hed Shear component Hed Shear i campanaent Hed Shear Magnitude Eddy Viscosity Water Depth Grid Figure 2 21 o You can personalize your view styles through Settings menu You can show or hide the Legend Title Grid Ee Boundary Simulation Time Chapter 2 Example 1 Steady Flow Simulation 21 DRY Frame XY Axis and Velocity Vector Al and add Text ar o In Settings menu you can also select Color Scale Gray Color or Reverse Color Map set Background Color and choose Plot Types Water Surface Level m aap Ime 5 13 20 0 10 000 10 361 10 721 11 082 601688p 4 601674p 4 601659p 3 601644H 2 601629 3621513 2 3621761 3 3622009 4 26222575 3622505 6 Water Surface Level m 6017338 9 5 13 20 0 11 442 10 361 10 721 11 082 601714 8 601695 6 601675 4 601656p 2 601636B 1 36215347 3621860 0 3622185 4 36225107 3622836 1 362 Figure 2 22 Chapter 2 Example 1 Steady Flow Simulation 22 e After the simulation is finished you can use the History File Editor to manipulate the visualization of the
6. __ 6_ 6_ 40 TN C ETE ZI 45 VISUALIZE SEDIMENT RESULDTS 2 e tete de cs 46 4 EXAMPLE 3 UNSTEADY FLOW SIMULATION USING SIMULATION WIZARD 50 AC IN TROD OC LION a 50 PIE 50 Table of Contents 4 4 VISUALIZE RESULTS 11 1 Introduction 1 1 Purpose This Quick Start Guide is intended to provide step by step instructions through example applications to help new users get familiar with the CCHE2D GUI It keeps emphasizes on how to use CCHE2D GUI to run numerical simulations in the interactive graphical environment Two main examples are described in this guide to demonstrate the application of CCHE2D GUI to practical engineering problems This guide will neither show all the capabilities nor describe in detail the functionality of each feature of CCHE2D GUI For a complete description of CCHE2D GUI please refer to CCHE2D GUI Users Manual 1 2 Applicability This Guide applies to CCHE2D GUI version Beta 2 2 The current version 2 2 is NOT completely backward compatible with the previous versions Users of previous versions should backup their data before using this version to simulate the old cases you ve already done to avoid the loss or damage of data 1 3 Using
7. Tisystem32 cmd exe 159 3 688556 168 3 703704 161 3 726852 162 3 75 HRB 163 3 723148 164 3 796295 165 3 819444 166 3 842592 167 3 865741 168 3 888889 169 3 712037 178 3 735185 171 3 958333 1772 3 981482 173 4 4 3 174 4 02 727078 175 4 050926 176 4 874674 1777 4 097222 178 4 128378 179 4 143518 188 4 166667 181 4 189815 182 4 212963 4 236111 the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timesteps the total timeste Figure 4 11 Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 61 4 4 Visualize Results As stated in chapter 2 there are three kinds of flow results files flow intermediate file mdw flow final results file fTw and flow history file his e During the simulation you can view the intermediate results file You can choose to load it either manually or automatically Please see section 2 11 Water Surface Level m 5 640 6 167 6 735 7 282 7 830 File Status Action Status Geo File Available Set Flow Initial
8. 0 Total Time Steps 26040 Turbulence Turbulence Model Option Mixing Length Model Turbulent viscosity coefficient Unsteady Flow Computation Optional Required lt lt Back gt gt Execute Cancel Monitor Points Convergence Compute as quasi steady flow Time Steps to reach steady state Numerical Wall slipriess coefficient Depth to consider dry Time Iteration Method Method 2 Cancel Apply Figure 4 5 o For parameters in Bed Roughness page and Advanced page we use the default values o InSet Flow Parameters click OK to save the parameters Weskip steps 4 and 5 and go to step 6 Set Inlet Outlet Boundary Conditions e pss o Click Execute to activate the boundary editing toolbar Click two ending points along the first mesh J line and define it as inlet boundary Select Inlet Boundary Condition in Select Inlet Outlet Boundary dialog window and then click OK The Inlet Boundary Conditions dialog window will appear Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 56 Wizard x Steps File Status Action Status Mote A Open a Geo File Available Done Required 4 Set Flow Initial Conditions Available Done Optional 3 Set Flow Parameters Available Done Required 4 Set Sediment Parameters Missing Mot Done Optional Set Sediment Boundary Conditions Missing NotDone Optional Set Inlet Ou
9. Figure 2 12 In Inlet Boundary Conditions dialog gt In the Flow page select option Total discharge and enter the value 570 0 gt Click OK to save the inlet boundary conditions Chapter 2 Example 1 Steady Flow Simulation 15 Inlet Boundary Conditions Figure 2 13 e Then we set the outlet boundary conditions o Click E and then click the start and the ending points along the last mesh J line In Select Inlet Outlet Boundary dialog choose option Outet Boundary Condition and then click OK 16 Chapter 2 Example 1 Steady Flow Simulation Cancel 10 Delete BIE Figure 2 14 Figure 2 15 Inlet Boundary Condition Outlet Boundary Condition C Open boundary condition Water surface level m Outflow angle degrees 9 Flow Options Rating curve C Stage hydrograph Outlet Flow Boundary Condition level and then enter the value of 10 Finally click OK to save the outlet o In Outlet Flow Boundary Condition dialog select option Water surface boundary condition TF BS S LL AIT Hj Chapter 2 Example 1 Steady Flow Simulation 17 2 6 Run CCHE2D Model After all the initial conditions and the boundary conditions are set the simulation can be performed e Select Run CCHE2D Model in menu Simulation or click E in the main toolbar to activate the Simulation Options dialog window Simulation Options Simulation Number 1
10. m 0 Bed Sample Number Sample 1 Whole Domain Define Distribution Please specify both thickness and sample number for EACH LAYER Layer Number Nodal Eradibility and Thickness t Eradibility C Erosion Thickness m C Maximum Deposition Thickness Whole Domain Define Distribution m Undo All 5 ET Edit Bed Material Properties Layer properties Number 1 Layer Thickness m 02 Bed Sample Number Sample 1 B Whole Domain Define Distribution Please specify both thickness and sample number for EACH LAYER Layer Number Nodal Erodibility and Thickness Eradibilit C Erosion Thickness C Maximum Deposition Thickness Whole Domain Define Distribution Undo Unda Al sse ET Edit Bed Material Properties x Laver properties Number 2 Laver Thickness m 1 0 Bed Sample Number Sample 1 Whale Domain Define Distribution Please specify both thickness and sample number for EACH LAYER Layer Number Eradibilitu and Thickness Eradibility Erosion Thickness m Deposition Thickness Whole Domain Define Distribution m Undo All se ET Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 43 Edit Bed Material Properties X Edit Bed Material Properties x Layer properti
11. 00025 0 0005 0 001 1 0142857 0 142857 0 142857 0142857 0142857 0 14285 Import Save Suspended Sediment Boundary Condition File sbc E sit Number of Size Classes F Number of Data Points Figure 3 6 Enter the desired values for time discharge and the fractions of each size class in the corresponding cells The fractions should be 0 4 0 2 0 2 0 2 0 0 0 0 and 0 0 Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 33 File Editor E ____ ___ ec gt F EE Tine isenare Class cess ciassa Classe 0000 _ J MEER EE 5 Suspended Sediment Bounda Condon _ Number of Size Classes Number of Data Points T Figure 3 7 o Click Save to save your changes into file Vistula sbc Save As SBC File Vistula sbe Suspended Sediment Boundary Condition Fi Figure 3 8 Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 34 e Select BedLoad Boundary Condition File bbc from the file selector o Specify the Number of Data Points as 1 and then click New to create a template for bbc file File Editor A B D E F G H Time Discharge Class Class Class Class4 Class Class 5 ikos 7 5e 005 0 0001 0 00015 00 00025 0 0005 0 001 0 1 0
12. 142857 0 142857 0 142957 10 142857 0 142857 0 14285 Import Save Boundary Condition File bbc Number of Size Classes Number of Data Points Figure 3 9 Enter the desired values for time discharge the fractions of each size class in the corresponding cells The fractions should be 0 054 0 06895 0 26835 0 5465 0 0459 0 01485 and 0 00145 Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 35 File Editor x SSW Sn ea Classe Eh 0 009 05509 0000 0005 020029 0000 0000 Save eedtosd Bounda Condon Fie bbe El _________ Figure 3 10 o Click Save to save your changes into file Vistula bbc Save As BBC File _ Svisula H Vistula Boundary Condition Files bbe Figure 3 11 Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 36 3 6 Set Inlet and Outlet Boundary Conditions In Chapter 2 we already set the flow boundary conditions of the inet and outlet In this chapter we only need to set the sediment inlet boundary conditions e Select Start Editing Inlet Outlet Boundary from menu Simulation or button 9 to T activate the editing toolbar 0 then select the inlet node string which 15 indicated by an arrow pointed into the domain The Inlet Boundary Conditions dialog will be activated
13. Conditions Available Optional Set Flow Parameters Available set Sediment Parameters Optional Optional Required Optional Optional Missing Required i lt lt Back Ment gt gt Execute Cancel Figure 4 12 e After the simulation finished you can view the flow final results file and the history file Please see section 2 11 References Yafei and Wang Sam S Y 2001 CCHE2D Two dimensional Hydrodynamic and Sediment Transport Model for Unsteady Open Channel Flows Over Loose Bed NCCHE Technical Report NCCHE TR 2001 01 Aug 2001 Wu Weiming 2001 CCHE2D Sediment Transport Model NCCHE Technical Report NCCHE TR 2001 03 Aug 2001 Zhang Yaoxin 2005 CCHE2D Mesh Generator Users Manual Version 2 50 NCCHE Technical Report NCCHE TR 2005 01 Jan 2005 Zhang Yaoxin 2005 CCHE2D GUI Graphical User Interface for CCHE2D Model Users Manual Version 2 2 NCCHE Technical Report NCCHE TR 2005 03 May 2005
14. Then Lt H es E E ae E E L E ll File name Mississppircv D pen Files of type Rating Curve Files rev Cancel y gt Figure 4 10 We skip steps 7 and 8 and go to step 9 CCHE2D Model Locally o Click Execute to activate the Simulation Options dialog window o In Simulation Options dialog select option Start Flow Simulation from Rest and then click Start Simulation Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 60 Initial Bed Elevation 4 370 5 470 8 270 7 670 8 770 x Steps File Status Action Status Note 1 Open Geo File Available Done Required E Set Flow Initial Conditions Available Done Optional 3 Set Flow Parameters Available Dane Required 4 Set Sediment Parameters Missing Mot Done Optional 5 Set Sediment Boundary Conditions Missing Mot Done Optional f Start Flow Simulation from Rest Set Inlet Gutlet Boundary available Done Required RET SE T Set Bed Material Samples Missing Optional B Set Bed Material Properties Missing Mot Oone Optional P _ Run CCHE2D Locally Missing Required pe ie s lt lt Back gt gt Execute Cancel Start Simulation Cancel
15. This Guide This guide assumes that CCHE2D GUI has already been installed and it is working properly on your computers If you have any problems with the installation please contact the developer for help This guide uses data sets of real rivers to demonstrate how to use CCHE2D GUI for flow simulation and sediment transport simulations The first example is the steady flow Chapter Introduction 2 simulation for Vistula River in Poland The second example the steady flow simulation with sediment transport is continuous from the first example The third example uses a reach of the Mississippi River in United States for unsteady flow simulation without sediment transport By following these three examples you should be able to set up CCHE2D for the simulations of similar cases For more complicated cases you need to explore the CCHE2D GUI Users Manual in detail In order to simulate real cases more reasonably and correctly please refer to the Technical Report of CCHE2D Numerical Model 1 4 Related Documents The documentation of CCHE2D consists of several publications designed to fulfill the needs of different audiences They are simply listed as follows CCHE2D GUI Quick Start Guide is intended for the first time users CCHE2D GUI Graphical Users Interface for CCHE2D Model User s Manual describes in detail the capabilities and How Tos of CCHE2D GUI CCHE2D Two dimensional Hydrodynamic and Sediment Transport Model for
16. Unsteady Open Channel Flows Over Loose Bed describes in detail the basic mathematics numeric hydraulics and sediment transport approaches CCHE2D Sediment Transport Model describes in detail the governing equations boundary conditions numerical methods and empirical formulas of the CCHE2D non equilibrium transport model of non uniform sediment CCHE2D Mesh Generator Users Manual is aimed at how to generate computational meshes for the CCHE2D model It is associated with a separate software CCHE2D Mesh Generator 2 Example 1 Steady Flow Simulation 2 1 Introduction This chapter will illustrate how to use CCHE2D GUI to simulate steady flow using the data from the Vistula River in Poland All data is included as example files in the installation package of CCHE2D GUI 2 2 Open Geo File The first step in getting a case ready for simulation is to generate a mesh for the domain of interest A mesh file a file with a geo extension 15 required by both the CCHE2D GUI and the CCHE2D numerical model The mesh file contains the geometry and the initial conditions of the grid such as the x y coordinates the initial bed elevation the initial water surface level the bed roughness and the nodal type For use this guide a mesh file is provided with the model e Start CCHE2D GUI by either double clicking the CCHE2D GUI icon on your Windows desktop or by clicking the icon from CCHE2D GUI group of your Windows programs in the
17. history results To load the history file select Flow History File in Visualization menu The History File Editor will appear History File Editor Set min and max values based on global values C Set min and values based on local values C Set min and values based on current flood values Seb Select Frame for Display fu Flow time sec Sediment time sec 250447839 34130 250447839 34130 Fram frame frame no 8 Extract Frame Data Skip Delay sec Export Images Create Figure 2 23 You play the frames Extract Frame Data to flw file Export frames as Bitmap Images and Create AVI for frames o Click Extract Frame Data and save the frame data into a flw file The name of the flw file has special rules for details please refer to Chapter 4 section 4 11 of CCHE2D GUI Users Manual Here let s put a name of Vistula Run 3 0 flw and then click Save This flw file can used as start flow field for later runs Chapter 2 Example 1 Steady Flow Simulation 23 Save Frame Data As Flow Results File vistula_Run 1 107 a vistula Run 2 1 fhw File name vistula un 3 D Flu Save Flow Results Files Cancel Figure 2 24 Click Export Images and the selected frames will be saved into Bitmap images File name vistula B MF Save as type
18. will be linearly interpolated along constant I lines Keep current flood min and max values Assign WSL Roughness or Bed Elevation Initial water surface level Roughness Bed elevation x Whole Woman Deme Distribution interpolate along constant l lines Assign new ID to nodes Select a region by clicking on two different nodes nterpolate along constant J lines OK 6 nterpolate initial water surface level Identify a region by selecting two nodes Undo Save Undo All Exit Figure 2 5 Chapter 2 Example 1 Steady Flow Simulation Nodal Prope xi Keep current flood min and max values Assign WSL Roughness or Bed Elevation C Initial water surface level Roughness Bed elevation Whole Woman Defne Wistibution C Assign new ID to nodes Select a region by clicking on two different nodes 6 nterpolate initial water surface level Identify a region by selecting two nodes Undo Undo All Exit Figure 2 6 e Select option Roughness o First click Whole Domain and enter 0 035 in the Assign Value dialog and then click OK Chapter 2 Example 1 Steady Flow Simulation 9 Keep current flood min and max values Assign WSL Roughness or Bed Elevation 4 C Initial water surface level BR m f Roughness AAS Bed elevation Specify roughness coefficien
19. 25925 745 4 92 5925925925026 MESCALE FOR SEDIMENT ENLARGED TIMESCALE FOR SEDIMEHT ENLARGED 92 8538892592593 92 8538892592593 92 9530092592593 92 9530092592593 92 8530092592593 ARE _ 398 HUMBER OF DRY NODES AT THE BEGINNING 8 GG0000G00000000E 000 of the total of the total of the total of the total 5 466008 I TIME SCALE FOR SEDIMENT 18 z of the total z of the total z of the total of the total 1 timesteps B ABGGGGRERR0G000E 000 ri ro of the tota 111111 TIME SCALE FOR SEDIMENT iH HHBBHHBBHHHBHH the timesteps timesteps timesteps timesteps HHA 1 250006000000 timesteps timesteps timesteps timesteps z 1 5625HBHBBHHHHHBH timesteps timesteps timesteps timesteps timesteps Figure 3 21 3 10 Visualize Sediment Results Similarly to flow result files there are also three kinds of sediment result files sediment intermediate file mds sediment final results file sdm and sediment history sed e During the simulation you can visualize the intermediate file any time To load it manually select Sediment Intermediate File in Visualization menu C
20. DIB Files BMP Cancel p Figure 2 25 Chapter 2 Example 1 Steady Flow Simulation 24 o Click Create AVI and the selected frames will be saved into a AVI movie file Create an AVI file C3 Vistula er E3 vistula File name Vistula avi Files of type favi Files avi LE Figure 2 26 3 Example 2 Steady Flow Simulation with Sediment Transport 3 1 Introduction In Chapter 2 the steady flow simulation of the Vistula River has been conducted This chapter will illustrate how to use CCHE2D GUI to simulate sediment transport for the Vistula River All data is included as example file in the installation package of CCHE2D GUI 3 2 Open Geo File To conduct a simulation the first step is always to open a geo file e Select Open Geometry in File menu or click lin the main toolbar Navigate to the directory of Vistula and select the Vistula geo then click Open Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 26 Open a Geometry File 2 Leek ii Cy Vistula er E3 vistula geo File name vistula geo Files of type CcHE2DGUI Geometry Files geo Cancel LE 8 C Documents and Settings yzhang CCHE2D_GUI example Vistula vistula CCHE2D GUI File Simulation View Settings Visualization Data Help ols 9 e O ae e 18719 5 15 7 DIRAN N e t Ilt B Initi
21. NATIONAL CENTER FOR COMPUTATIONAL HYDROSCIENCE AND ENGINEERING CCHE2D GUI Version 2 2 Quick Start Guide Technical Report No NCCHE TR 2005 04 June 2005 Yaoxin Zhang 8 C Documents Settings yzhang CCHE2D_GUI Vistulalvistula CCHE2D GUI Simulation View Settings paler Data nad Obs I 3 711 Water Depth I NN Time 10 15 56 0 037 2 523 4 008 5 494 3622115 4 3622255 3622394 7 3622534 3 1 1 1 178 3622272 288000 Y 6016945 349000 Yar 0 2 Data Intermediate Result File Flow School of Engineering The University of Mississippi University MS 38677 NATIONAL CENTER FOR COMPUTATIONAL HYDROSCIENCE AND ENGINEERING Technical Report No NCCHE TR 2005 04 CCHE2D GUI Version 2 2 Quick Start Guide Yaoxin Zhang Post doctoral Research Associate The University of Mississippi June 2005 Table of Content LINTRODUCTIQDN 1 BIEPURPO E 1 I 1 USNOG DHIS epic ieu eyed bins 1 RETA TED DOCUMEN ue otros 2 2 EXAMPLE 1 STEADY FLOW 8
22. SetBed Material Properties Missing Not Done Optional Run CCHEZD Model Locally Missing Mot Done Required lt lt Back gt gt Execute Cancel Open Discharge Hydrograph Pile x Look in esfork efarkh1 dhg Boundary Flow Options Total discharge mrs Oo Poop S oo 2 Discharge hydrograph Inflow angle degrees 0 Set Flow Parameters Delete Faw HE Cancel Apply File name Open Files of type Discharge Hydrograph Files dag hd Cancel 2 Figure 4 7 Click two ending points along the last mesh J line and define it as outlet boundary Select Outlet Boundary Condition in Select Inlet Outlet Boundary dialog window and then click OK The Outlet Flow Boundary Conditions dialog window will appear Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 58 Set Flow Parameters Set Sediment Parameters Optional seing Optional Set Bed Material Samples Missing Not Done Optional Set Bed Material Properties Missing Not Done Optional Required P lt lt Back gt gt Execute Cancel 2 Select Inlet OutLet Bout x Wy ee Inlet Boundary Condition 22 Za eee 4 zee SS SS SO Bes SS SS SS See 4 Outlet Flow Boundary Conditions select option S
23. Start Flow Simulation fram C fontnue Hon Simulation from Aaw at fine C Start Sediment Transport sin how Time C Sediment from Resulte ab line Start Simulation Cancel Figure 2 16 e Select option Start Flow Simulation from Rest only this option is available for the first time run and then click Start Simulation The flow simulation will be carried out in a console window Chapter 2 Example 1 Steady Flow Simulation CAWI NTisystem32 cmd exe 1 759259 1 778833 1 7824H 7 1 793981 1 885556 1 817138 1 828704 1 840278 1 851852 1 963426 1 875 HBHH 1 885574 1 898148 1 989722 1 921296 1 932870 1 944444 1 956019 1 957593 1 979167 1 998741 2 002315 2 013889 2 825463 2 a A A MM A A OS OX GX GX GN GX GAY GND ND timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timesteps timeste 18 Figure 2 17 2 7 Visualize Flow Results After you start simulations and the intermediate results are available you can visualize the results For flow there are three kinds of result files available flow intermediate file flow final re
24. Steady Computation Time steps to adjust How 20 Erosion Deposition limit 0 01 0 05 of depth jan Cancel Apply Figure 3 4 30 e The Bed Roughness page Set Sediment Parameters contains the same parameters in Set Flow Parameters Since we already set the parameters of bed roughness in Set Flow Parameters we don t need to specify them here e Click OK or Apply to save your settings 3 5 Set Sediment Boundary Conditions The information of sediment boundary conditions are provided by the suspended sediment boundary condition file sbc and the bedload boundary condition file bbc The CCHE2D GUI provides a file editor to edit these two files Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 31 e Select Set Sediment Boundary Conditions in menu Simulation to invoke the File Editor A D E F G H a 1 2 3 4 5 B 7 8 9 10 11 12 13 14 Mev Import Fave Suspended Sediment Boundary Condition File sbc N Umber of Size Classes Number of Data Points Figure 3 5 Select Suspended Sediment Boundary Condition File sbc from the file selector o Specify the Number of Data Points as 1 and then click New to create a template for sbc file Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 32 File Editor x A B D E F 5 H Time Discharge Class Class Classi Class4 lass Classe 5 7 5e 005 1 0101 0 00015 0
25. activate the Nodal Properties dialog window Nodal Properties Assign Keep current flood min and max values Assign WSL Roughness Bed Elevation nitial water surface level C Roughness C Bed elevation VW hole Domain Define Distribution C Assign new ID to nodes Select region by clicking an two different nodes nterpolate initial water surface level Identify region by selecting two nodes meo Undo All Figure 2 2 e You can select the flow variable by checking the radio button in Assign WSL Roughness or Bed Elevation To specify a constant value of selected variable through the entire domain you should click Whole Domain to specify a spatial Chapter 2 Example 1 Steady Flow Simulation 6 distribution you should click Define Distribution and then selecting two points to define a rectangular area within the mesh e First select option Initial water surface level For this case we choose to specify a linear distribution in J direction for initial water surface level To identify the I and J directions of the mesh you can move the mouse on the mesh the nodal information including the I and J index will be displayed in the status bar Click Define Distribution and then select two points along the last mesh J line In Assign Value dialog enter value 10 and click OK Keep current flood min and max values Assign WSL Roughness or Bed Elevation
26. al Bed Elevation 7 488 19 1 1 3621166 120000 Y 6015674 782000 Var 8 81 Data Geometry File Grid Figure 3 1 Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 27 3 3 Set Flow Parameters The flow parameters are already set 1n Chapter 2 please refer to section 2 4 for details We don t need to set them here 3 4 Set Sediment Parameters Sediment parameters are specified through a dialog accessible from the Set Sediment Parameters option in the Simulations menu There are four pages Sediment Size Classes Sediment Transport Sediment and Bed Roughness e In Sediment Size Classes page o First define the Number of Bed Layers as 3 and set the Minimum Mixing Layer Thickness as 0 05 o Then define the following 7 size classes as shown in Figure 2 12 Each size class is defined using the same procedure first enter the Diameter and then click Add Size Class Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 28 Set Sediment Parameters x sediment size Llasses Sediment Transport Sediment Bed Roughness Number of Bed Layers Minimum Mixing Layer Thickness 0 05 Define Size Class Mean diameter m Diameter m of each size class 0 0000 7500 fo 002 0 00010000 0 0007 5000 0 00025000 D 00050000 Add Size Class 0 007 00000 0 00200000 Delete Size Class Clear All Figure 3 2 e In Sediment Transport page sele
27. ct Total Load as Bed Load Plus Suspended Load transport mode set the Sediment Simulation Mode as Slow Bed Change with Steady Flow specify the adaptation length for bed load as 100 set the adaptation factor for suspended load as 0 04 Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport Set Sediment Parameters x Sediment Size Classes Sediment Transport Sediment Bed Roughness Transport Mode Tata Load as Bed Load Plus Suspended Loar Transport Capacity Formula vu et al formula Sediment Simulation Made Slow Bed Change with Steady Flow Fast Bed Change with Unsteady Flow Adaptation Length For Bedlaad Set as average grid length 7 Set as 7 3 of average dune length 1000 Specify adaptation length Adaptation Factor for Suspended Load C Based on Armanini and di Silvio 1988 Specify adaptation factor Cancel Aol Figure 3 3 29 e In Sediment page set the Time steps to adjust flow as 20 and the Erosion Deposition limit as 0 01 We use the default value of the Sediment specific gravity and choose not to include curvature effects Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport Set Sediment Parameters x Sediment Size Classes Sediment Transport Sediment Bed Roughness Sediment specific gravity 2 65 Curvature Effects Include curvature effects Average channel width
28. e Finally click Save to save the changes and then click Exit Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 45 3 9 Run CCHE2D Model After all the initial conditions and the boundary conditions are set the simulation can be performed e Usually the simulation of sediment transport is divided into two steps First run steady flow simulation After flow simulation is finished we run sediment transport simulation In Chapter 2 the flow simulation 15 already finished We can directly run the sediment transport e Invoke the Simulation Options dialog window by selecting Run CCHE2D Model in the menu Simulation or clicking dn the main tool bar Then select option Start Sediment Transport using Flow Field at Time There is only one flow field available Select that flow field and click Start Simulation The sediment transport simulation will begin Simulation Options Simulation Aun Number 2 C Start Flow Simulation from Rest C Continue Flow Simulation fram Flow Field at Time 40000 Hun Number 1 Start Sediment Transport Using Flow Field at Time 4800005 Hun Number 1 C Sediment transport fom Resulte at line Start Simulation Cancel Figure 3 20 Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 46 CAWINNTisystem32 cmd exe PROGRAM RUNS In stream structure is specified 1 92 5925925925926 2 92 5925925925926 3 92 59259
29. es Laver Number Number 5 E f Layer Thickness m Bed Sample Number Sampe Whole Domain Define Distribution Please specify both thickness and sample number for EACH Layer properties Laver Number Mumber3 Layer Thickness m 19 Bed Sample Number Sample 1 Whole Domain Detine Distribution Please specify both thickness and sample number for EACH LATER Nodal Erodibility and Thickness Eradibility Nodal Erodibility and Thickness Eradibility Erosion Thickness m Maszimum Erosion Thickness m C Maximum Deposition Thickness m Whole Domain Define Distribution Maximum Deposition Thickness m Whole Domain Define Distribution m D save EN mm Unda All save EN Figure 3 18 e Then let s specify the nodal erodibility and thickness o Select option Erodibility and select YES and then click Whole Domain in group Nodal Erodibility and Thickness This indicates that the bed is erodible throughout the domain o Select option Maximum Erosion Thickness and enter the value of 80 and then click Whole Domain o Select option Maximum Deposition Thickness and enter the value of 80 and then click Whole Domain o Note that we specified very large erosion and deposition thickness to indicate that virtually no limit should Chapter 3 Example 2 Steady Flow Simulation with Sediment Transpor
30. hapter 3 Example 2 Steady Flow Simulation with Sediment Transport C Documents and Settings yzhang CCHE2D_GUl example istulalvistula CCHE2D GUI File Simulation View Settings Visualization Data Help J J 1 2 1 9 9 Gy Sie ante Final Bed Elevation rn 488 9 278 11 067 1 34 1 254 3622977 314000 Y 6017227 176000 8 Intermediate Result File Sediment A Figure 3 22 To load it automatically select Auto check Sediment Intermediate Result In Set Time Interval dialog set the time interval as 10 and then click OK Set Time Interval Time Interval to Check Results second Lancel Figure 3 23 Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 48 e After the simulation is finished you can visualize the final results file o Select Sediment Final Results File in Visualization menu In Select Sediment Results File dialog window select the flow field and then click OK Select Sediment Results File Display Sediment Results at Time 2 321 21 009 Run Number 2 Figure 3 24 e After a result file mds sdm is loaded You select sediment variables from variable selector on the main toolbar gt Gy 29 Final Bed Elevation Final Bed Elevation Hed Elevation Change Final 050 Distribution af Bed Materi Hed Load Transport Rate Suspended Load Concentration Init
31. ial Bed Material Composition Final Bed Material Composition Fractional Bed Load Transport Rate Fractional Suspended Load Conce Figure 3 25 o If you select Fractional Bed Load Transport Rate or Fractional Suspended Load Concentration you can select Sediment Size Class Display in menu Visualization to view the results for each size class Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 49 Fract Bedload Rate kg s m Size Class 3 0 823 0 617 0 411 0 205 0 000 Figure 3 26 e After the simulation is finished you can use the History File Editor to manipulate the visualization of the sediment history results Please see section 2 7 4 Example 2 Unsteady Flow Simulation Using Simulation Wizard 4 1 Introduction This chapter will illustrate how to use CCHE2D GUI to simulate unsteady flow without sediment transport using the data from Esfork River USA data is included as example file in the installation package of CCHE2D GUI The simulation procedure for unsteady flow without sediment transport is quite similar to Vistula case see Chapter 2 To avoid repeating this chapter will focus on the use of wizard to run simulations 4 2 Open Geo File The first step for setting up a case for simulation 15 to open a geo file e Start CCHE2D GUI by either double clicking the CCHE2D GUI icon on your Windows desktop or click the icon from CCHE2D GUI group of your Windows programs e Se
32. lect Open Geometry in File menu or click Z inthe main toolbar Navigate to the directory of Esfork and select the Esforkh1 geo then click Open Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 51 us a Geometry File spese 31 esfark File name eferkh Files of type CcHE2DGUI Geometry Files geo LE C Documents and Settingstyzhang CCHE2D_GUI example esfork eforkh l CCHE2D GUI File Simulation View Settings Visualization Data Bes Elevation 74 ony EG 7 0 1 I 21959019 on a S o E Initial Bed Elevation rn 1 33 1 1 821 550000 Y 66 500000 Var 8 720000 Data Geometry File Grid Figure 4 1 Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 4 3 Use Simulation Wizard To help the first time users quickly master how to run simulations through CCHE2D GUI a simple wizard is provided e First select Wizard in menu Simulation or click 7 in the main toolbar to activate the Wizard window There are 9 steps listed among which steps 4 5 7 and 8 are related to the sediment transport simulation In this case we will skip the above steps Missing Required Figure 4 2 Steps e Since the first step Open a Geo File is already done we will begin with step 2 Set Flow Initial Conditions o Use Next gt gt button to navigate to step 2 Set Flow Initial Conditio
33. me option as the one selected for flow Chapter 2 Example 1 Steady Flow Simulation 12 Flow Parameters E Use the value in file Figure 2 10 e Advanced page we use the default values Chapter 2 Example 1 Steady Flow Simulation 13 Set Flow Figure 2 11 e Click OK to save the flow parameters you specified 2 5 Set Inlet and Outlet Boundary Conditions Initially all the boundaries of the domain are assumed as walls To set inlet and outlet boundary conditions there are two steps to follow editing boundary node strings and attaching boundary conditions to the node strings Chapter 2 Example 1 Steady Flow Simulation 14 e Select Start Editing Inlet Outlet Boundary from menu Simulation or button 9 0 gt activate the editing toolbar D Je First we set the inlet boundary conditions Click E and then click the start and the ending points along the first mesh J line In Select Inlet Outlet Boundary dialog choose option Inlet Boundary Condition and then click OK SS 5555 555555555555 f Inlet Boundary Condition BW XX Wrens OP SON 64 94 RNR NNN sy 505 SSS 9 9 9 29 9 SSS SIS C Outlet Boundary Condition
34. ng two nodes Undo Undo All Figure 2 8 e Click Save to save your changes into the geo file Note that the data in the geo file will be replaced by the data you just provided 2 4 Set Flow Parameters The flow parameters consist of Simulation parameters Bed Roughness parameters and Advanced parameters e Select Set Flow Parameters in Simulation menu to invoke the Set Flow Parameters dialog window Chapter 2 Example 1 Steady Flow Simulation 1 In Simulation Parameters page specify the parameters as shown in Figure 2 9 Set Flow Parameters x Simulation Parameters Eed Roughness Advanced Time Steps for Output Intermediate File 000 History File 000 Monitor Points jo n Time Step Simulation time 2 gt 8400 Time step 2 f Total Time Steps EJ 840 Turbulence Turbulence Model Option Parabolic Eddy Viscosity Model Turbulent viscosity coefficient Convergence Unsteady Flow Cornputatior Compute quasi steady flow Time Steps to reach steady state Numerical Wall slipniess coefficient Depth to consider dry Time teration Method Method 1 Figure 2 9 In Bed Roughness page make sure the option Use Values in geo File and Manning n in the group For Flow Simulation Only are selected The Bed Roughness Calculation Method in the group For Sediment Transport Simulation automatically takes the sa
35. ns and then click Execute The Nodal Properties dialog window will appear In Nodal Properties dialog select Initial water surface level and then click Whole Domain In Assign Value dialog enter the value 8 0 and then click OK Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 53 nitial Water Surface Level m 8 000 8 000 8 000 8 000 3 000 File Status Action Status Keep current flood min and max values Assign WSL Roughness Bed Elevation Roughness NAR Missing Required lt lt Back Ment gt gt Execute Cancel Whole Domain Define Distribution Assign new ID to nodes Select a region by clicking on two different nodes Assign C nterpolate initial water surface level Identify region by selecting two nodes Unde Save Undo A E xit Specify initial water surface Make sure the value is higher than bed elevation Value 80 Cancel Figure 4 3 Nodal Properties select Roughness and then click Whole Domain In Assign Value enter the value of 0 03 and then click OK Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 54 Roughness Manning s n ar Ks 0 030 0 030 0 030 0 030 0 030 x OLEN CET Pills Available ga Set Flow Initial Conditions Available Optional Keep current flood min and mas values Set Flow Parameters Missing MotDone Required ears Set Sediment Pa
36. rameters Optional i MNA LE S et Sediment Boundary Conditions Missing NotDone Optional g Padus Bed elevation Missing Missing Required lt lt Back Next gt gt Execute Cancel Assign new ID to nodes Select region by clicking on two different nodes Whole Demain Define Distribution nterpolate initial water surface level Identify region by selecting two nodes Undo Save Undo All Exit Specify roughness coefficient Either in the form of Manning s n ar roughness height Wa Figure 4 4 In Nodal Properties click Save to save your changes Then click Exit The Action Status of step 2 will become Done e Then we go to step 3 Set Flow Parameters using Next gt gt button o Click Execute to activate the Set Flow Parameters dialog window In Simulation Parameters page we set the simulation time as 2592000 s 30 days and set the time step as 600 s 10 mins Other parameters are shown in Figure 3 4 Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 39 Initial Bed Elevation m 1 File Status Action Status Open Geo File Available Set Flow Initial Conditions Available Optional Set Flow Parameters Simulation Parameters Bed Roughness Advanced Time Step Time Steps for Output Intermediate File Histo Fle 240 Simulation time s 1952400 Time step 2
37. ss Erodibility ves C Maximum Erosion Thickness m 50 Maximum Deposition Thickness m Whale Domain Define Distribution Undo EN Figure 3 17 e First specify the Layer properties o Select Number 1 from Layer Number selector The total number of bed layer is 3 see section 2 5 o Select option Layer Thickness and enter the value of 0 5 and then click Whole Domain in group Layer properties o Select option Bed Sample Number and select Sample 1 from sample selector and then click Whole Domain The total number of bed sample is 1 see section 2 8 o Repeat the above steps until properties for all layers are specified Set Layer Thickness 1 0 and 2 0 for the Number 2 and Number 3 layer and set Sample 1 for the rest two layers Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport Edit Bed Material Properties Layer properties Number 1 Layer Thickness m 02 Bed Sample Number Sample 1 whole Domain Define Distribution Please specify bath thickness and sample number for EACH LAYER Layer Number Nodal and Thickness Erodibility ves Maximum Erosion Thickness m 3n fao Define Distribution C Deposition Thickness m Whole Domain Undo Al save ET Edit Bed Material Properties x Layer properties Number 2 Layer Thickness
38. start menu e Select Open Geometry in the File menu or click Z in the main toolbar Navigate to the directory named Vistula and select the Vistula geo file then click Open Chapter 2 Example 1 Steady Flow Simulation Open a Geometry File 2 Look in t File name vistula geo Files of type CcHE2DGUI Geometry Files geo Cancel LE 8 C Documents and Settings yzhang CCHE2D_GUI example Vistula vistula CCHE2D GUI File Simulation View Settings Visualization Data Help Ole 3 1 1 7 2 2 15 ol amp annaeotierm Initial Bed Elevation m 7 488 19 1 1 3621166 120000 Y 6015674 782000 Var 8 81 Data Geometry File Grid Figure 2 1 Chapter 2 Example 1 Steady Flow Simulation 5 If you are not satisfied with the mesh you can either regenerate a new mesh using CCHE2D Mesh Generator or edit the mesh for small modifications using the Grid Editing toolbar of CCHE2D GUI For details of grid editing please refer to Chapter 4 in CCHE2D GUI Users Manual 2 3 Set Flow Initial Conditions In addition to the geometry information the mesh file also contains the information of the initial flow conditions that include the initial water surface level bed roughness and initial bed elevation You can use the CCHE2D GUI to modify them e Select Set Flow Initial Conditions in Simulation menu to
39. sults file flw and flow history file his e During the simulation you can visualize the intermediate file any time To load it manually select Flow Intermediate File in Visualization menu Chapter 2 Example 1 Steady Flow Simulation 19 8 C Documents and Settings yzhang CCHE2D_GUlI example vistulalvistula CCHE2D GUI File Simulation View Settings Visualization Data Help ux E amp water Surface Level Wo x 0 O B9 Eg abt p z j og oie Water Surface Level Time 501 23 45 11 72 11 438 10 000 10 359 10 719 11 078 Ready 1 34 1 183 3622618 033000 Y 6016690 544000 Var 1 Data Intermediate Result File Flow 2 Figure 2 18 o To load it automatically select Auto check Flow Intermediate Result In Set Time Interval dialog set the time interval as 10 and then click OK Set Time Interval Time Interval to Check Results second Cancel Figure 2 19 Chapter 2 Example 1 Steady Flow Simulation 20 e After the simulation is finished you can visualize the final results file o Select Flow Final Results File in Visualization menu o In Select Flow Results File dialog window select the flow field and then click OK Select Flow Results File x Display Flow Filed at Time 4800005 Fun 1 Figure 2 20 e After a result file mdw
40. t Edit Bed Material Properties x Layer properties umber 3 Layer Number Layer Thickness m C Bed Sample Number Sample 1 Whole Domain Define Distribution Please specify both thickness and sample number for EACH Nodal Erodibility and Thickness Erodibility TES Maximum Erosion Thickness m 3n 30 Define Distribution Maximum Deposition Thickness m Whale Domain mu Unda Al see Edit Bed Material Properties pal Layer properties umber 3 Layer Number Laver Thickness m C Bed Sample Number Sample 1 Whole Domain Define Distribution Please specify both thickness and sample number for EACH Nodal Eradibilitu and Thickness Eradibility ED Maximum Deposition Thickness m o Whole Domain Define Distribution Undo seve ET f Maximum Erosion Thickness m Edit Bed Material Properties x Layer properties umbera C Layer Thickness m 2 0 Bed Sample Number Sample 1 Whole Comair Define Distribution Please specify both thickness and sample number for EACH Layer Number Nodal and Thickness Erodibility vE E 80 80 Defne Distribution Erosion Thickness m Deposition Thickness Whole Domain m Undo All sse ET Figure 3 19
41. t Either in the form of Manning s n roughness height Ks Whole Domain Define Distribution Assign new ID ta nodes Select a region by clicking an two Value 0 035 different nodes Cancel interpolate initial water surface level Identify a region by selecting two nodes Undo cave Undo All Exit 0 Figure 2 7 o Then click Define Distribution to specify anther value 0 025 for several regions x Keep current flood min and max values Assign WSL Roughness or Bed Elevation 4 t nitial water surface level 9 Roughness fo Specify roughness coefficient Either in the form of Manning s Bed elevation n or roughness height Ks Whole Domain Define Distribution C Assign new ID to nodes Select region by clicking on two different nodes Value 0 025 Cancel nterpalate initial water surface level Identify a region by selecting two nodes Undo Save Undo Al Exit Chapter 2 Example 1 Steady Flow Simulation 10 3oughness Manning s n or Ks 0 025 0 026 0 035 Keep current flood min and max values Assign WSL Roughness or Bed Elevation Initial water surface level Roughness Bed elevation Whole Domain Define Distribution Assign new ID to nodes Select a region by clicking on two different nodes interpolate initial water surface level Identify a region by selecti
42. tage hydrograph the Open a Stage Hydrograph File dialog choose Esforkhl1 shg and then click Open Then click OK in Outlet Flow Boundary Conditions to save the boundary conditions Similarly the stage hydrograph file must be provided by the user and its format can be found in CCHE2D GUI User s Manual For this case the file Esforkh1 shg is include in the Esfork River example Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 59 Steps File Status Action Status Note Open a Geo File Available Required 1 2 Set Flow Initial Conditions Available Done Optional B 3 Set Flow Parameters Available Done Required Flow Options 4 Set Sediment Paramters Missin Mat Done Optional mentParamters Missing NotDone Optional _ Water surface level m Set Sediment Boundary Conditions Missing Mot Done Optional 5 B Set Inlet Qutlet Boundary Available e T Set Bed Material Samples Missing Mot Dane Optional B aet Hed Material Properties Missing Optional C Stage hydrograph 9 Run CCHEZD Model Locally Available Mot Done Required lt lt Back Next gt gt Esecute Cancel 4 Hatam andie 0 LL VERO gt Lookin 3 Mississippi I Mississppi rev cm eund as Tes E Er 7 H
43. tlet Boundary xi 5 CO 7 Set Bed Material Samples Missing NotDone Optional S Inlet Boundary Condition B Set Hed Material Properties Missing Mot Done Optional Outlet Boundary Condition Cancel g Run CCHE2D Locally Missing Mot Done Required lt lt Back gt gt Execute Cancel T Figure 4 6 o In Inlet Boundary Conditions in Flow page select option Discharge hydrograph In the Open a Discharge Hydrograph File dialog choose Esforkhl dhg and then click Open Then click OK in Inlet Boundary Conditions to save the boundary conditions Note that the discharge hydrograph must be provided by the user and its format can be found in CCHE2D GUI User s Manual For this case the file Esforkh1 dhg is include in the Esfork River example Note that the hydrograph must start from t 0 Chapter 4 Unsteady Flow Simulation Using Simulation Wizard 57 Wizard a Steps File Status Action Status Mate Open a Gen File Available Done Set Flow Initial Conditions Available Done Optional Set Flow Parameters Available Required Inlet Boundary Conditions x Set Sediment Parameters Missin Mot Done Optional Missing NotDone p Flow Sediment Set Sediment Boundary Conditions Missing Mot Done Optional SetBedMaterialSamples _ Missing NotDone Optional 28 1
44. xample 2 Steady Flow Simulation with Sediment Transport 40 Enter the correct values for porosity and the fractions of each size class in the corresponding cells The fractions should be 0 054 0 06895 0 26835 0 5465 0 0459 0 01485 and 0 00145 Define Bed Material Samples 1 154 0 06895 0 26835 0 5465 0 0459 Reset Add Sample Figure 3 16 o Click OK to save the samples 3 8 Set Bed Material Properties After the bed samples are defined we need to set the initial bed material properties contained in a file with the extension bed For each mesh node we must define a series of properties that are required for the simulation of sediment transport There are five properties divided into two groups for each mesh node Layer Thickness Bed Sample Number Erodibility Maximum Erosion Thickness and Maximum Deposition Thickness Some properties such as Layer Thickness and Bed Sample Number must be defined for each layer in the bed e Select Set Bed Material Properties in menu Simulation to activate Modify Bed Material Properties dialog window Chapter 3 Example 2 Steady Flow Simulation with Sediment Transport 4 Edit Bed Material Properties Layer properties Layer Number Number 1 f Laver Thickness m EN C Bed Sample Number Sampe Whale D omain Detine Distribution Please specify both thickness and sample number For EACH and Thickne

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