Quick-Start Manual
Contents
1. o Select Advection and Advection multistep Prescribe maximal advection time step for instance 3600 s o For settling substances select Settling and time step o For oxygen select Water quality and time step Set up of boundary values and loads o Select Add item button from the control button row yellow and green button with a sign o Click either one point or select an area with the mouse and select the control Concentration or Load Set up animation options o Go to Model Animation Animation options o Select Variable from the list o Select appropriate scale O00 0 O 7 2 Floating substances oil fish larvae Go to Model Time steps check Particle calculation and prescribe time step e g 100 s Go to Model Animation Advanced animation options and check Draw particles in the Particle animation box at the bottom of the dialog window Select Add item button from the control button row yellow and green button with a sign click grid point where spill location is and select Particle release In case of continuous release check continuous release Observe that in this case number of particles nparticles can t be large because in each time step dtrelease nparticles are released Prescribe water and oil larvae density When particle calculation time step and animation are defined it is also2. Constant vertical viscosity Use small Constant horizontal viscosity value when the grid size is small appropriate values for grid sizes less than 1 km about 1000 cm s Usually don t check linear in Bottom friction Appropriate non linear bottom friction values are 0 0025 0 01 depending on the flow and type of the bottom Set start up Water level depending on your topographic reference system For instance when the reference system is MSL Mean Sea Level in Hathien the water level should be set around 165 m in Vientiane applications Set up animation options O O O O O Go to Model Animation Animation options Select Variable from the list For instance for flow speed select SPED Select appropriate scale for instance for SPED select 0 200 cm s If flow arrows need to be drawn check flow on and define arrow Coefficient The smaller the coefficient the smaller the animated arrows will be Prescribe Animation frame step the interval how often animation is updated Set up of boundary values wind load point time series points etc O O Select Add item button from the control button row yellow and green button with a sign Click either one point or select an area with the mouse and select the control 6 Inputting storing and using flow fields For storing a project click File Save For starting a new project go to Fil
3. implicity option requires that internal time step external time step in case of the layer calculation mode can be increased at least 100 Otherwise simulation is slower than without the Internal field option Select Input none Set up the time steps O O Go to Model Time steps Check External field Internal field Bottom friction and Flooding and giver corresponding time steps External field time step should be lt As 4 gH m g earth s gravitational acceleration m s and Aina Maximum water depth m Internal time step can be usually larger than the external one Flooding time step should be as large as possible 100 5 000 s because flooding changes simulation topology and most of the model coefficients have to re calculated making the flooding step computationally heavy Specify additional processes when needed Horizontal turbulence Vertical turbulence and Nonlinear advection or momentum advection The additional processes generally de stabilize simulation and may necessitate decreasing also other time steps where As is the model grid size max Set up model parameter values O O Go to Model Physical parameters In Vertical turbulence model select either Constant k e most universal or K If Constant vertical turbulence is selected provide viscosity values between layers by clicking
4. RNet user interface o Define specific structures gates dikes etc that connect the channels to the floodplain o Run the combined model from the 3D model user interface model executable has to be combined 123D executable 8 Hydrological simulation There exists both VMod distributed and HBV lumped applications for Tonle Sap tributaries They have been implemented during the WUP FIN Phase I Project WUP FIN Phase II hydrological applications cover Nam Songkhram watershed The can be found in ModelApplications M5 NamSongkhram NSK_VMod model and NSK_HBV model folders To start a VMod applications o select VMod user interface vm2 ip in the Nam Songkhram case to NSK_V Mod model folder o double click vm2 ip o select application vmp application in the sub folders for instance NamSongkhram vmp in NSK sub folder To start a HBV application go to HBV sub folder and double click one of the hbv files Use flow comparison option in the menu to compare simulated and observed discharges For model set up and use reader is referred to the VMod and HBV model manuals
5. possible to double click the interactive OpenGL animation window to release particles 7 3 Salinity intrusion Define variable SALT see 5 1 Select affects density see 5 1 Settling coefficient and sediment budget should not be checked Define k e turbulence model see 3 Prescribe boundary salinity values see 5 1 Go to Model Time steps o check Advection and Advection multistep and give maximal time step e g 1000 s o check Density calculation and prescribe time step e g 100 1000 s o check Diffusion and give time step e g 10 100 s o check convective mixing and give time step e g 100 1000 s this mixes water column when heavier water is on top of lighter one Go to Model Physical parameters Density and concentration computation and prescribe Horizontal diffusion In tidal areas diffusion can be high for instance 600 000 cm7 s Select animation parameter to SALI see 5 1 7 4 Sediment bed erosion bed load sedimentation bank erosion mud cohesive sediments For the definitions including sedimentation follow 5 1 Go to Model Time steps check Erosion and prescribe time step e g 100 500 s Even if flows are read from a dynamic field Bottom friction time step needs to be checked When impact of waves on erosion is required o click Model Physical parameters Fetch button and check dofetch o click Model
6. 3D Modelling Quick Start Manual by Jorma Koponen Senior Modelling Specialist koponen eia fi December 2010 For more detailed instructions see the 3D Modelling User Guide 1 User interface software installation Run VivSetup exe user interface and modelling support software Run MekongModelSetup exe 3D models 2 To run an existing application To open an application go to the application folder and double click on a fld file a flow model project file This opens the user interface You can start applications through Windows EIAModels start menu or EIAModels icon on the desktop Select Models 3D and push OK Select File open and select fld file Other types of applications for instance vmp for the distributed hydrological model can be opened similar way 3 Content of existing applications fld and vmp files The fld 3D flow model and vmp VMod files are project files with grid extent grid size boundary conditions parameter values variables flow sediment oxygen etc already included Consult the user manual for information on how to create new boundaries draw pictures etc For initial and output files go to point 6 4 Creation of a new flow model Open any fld project file in the ModelApplications sub folders Click File New Create model Create empty grid Specify file dimensions x y and grid size Click Model Grid depths to specify the grid elevations selecting ta
7. Physical parameters Waves button and check dowave select SPM 1984 Jonswap is for deep water Click Model Physical parameters Erosion button o check doerosion o select eroding variable SEDI o prescribe critical velocity for erosion e g 10 cm s this depends on the quality of the sediment and what kind of flow fields are used averaged dynamic fields smooth out flow peaks o prescribe erosion speed g m7 d At the moment bank erosion is not explicitly simulated but work for adding bank stability and erodability in the model is in progress It is observed that bank erosion seems to correlate strongly on river channel flow both horizontal and vertical In order to see vertical velocities go to Model Animation Advanced animation options and check Draw vertical velocities Prescribe Vertical scale in micro meters per second for instance 400 000 um s Vertical velocities are shown either as circles upward velocity or crosses downward velocity The vertical arrows can be also seen by rotating the animation and seeing the picture sideways Bed load and cohesive sediment mud simulation has to be turned at the moment in the model code These are new developments without user interface support 7 5 Structures dredging and other structural measures Blockages such as embankments or roads as well as dredged areas can be accommodated by changing the grid elevations o Go to Mode
8. bular editing enables copying from outside sources Observe that in the model sign is inserted to the elevations to make them negative This follows from the use of the model in two different modes either as i relative to a rather invariable water surface as positive depths or 11 as elevations negative depths Save project with a new name 5 Setting up the flow model or changing an old setup Set up model grid location o Go to Model Grid data o Prescribe model grid origo coordinates in the same reference system where maps are provided for the model and where model GIS outputs are used o Prescribe model longitude and latitude o Only latitude has effect on the flow simulation through Coriolis force Select flow simulation implicity and input modes o Go to Model Computational parameters o Select Calculation external internal for 2D layer velocity difference mode faster o Select Calculation layer for direct calculation of the layer velocities slower but in some cases such as high vegetation friction more accurate o Check predictor corrector for increased stability in high friction simulations even then this is not often needed makes simulation clearly more slow O O For improved stability check implicity for Internal field Vertical turbulence and Bottom friction Instead of using implicity other option is to use smaller time steps Internal field
9. e Save as and prescribe new name Each time a project model is run the previous output files including flow fields are overwritten if output file names are not changed either changing the names in the user interface or starting a new project with Save as Output file o Check Store end field to store the fields at the end of your simulation and prescribe file name exv o For Dynamic output select output type Usually select aver bin because it preserves flow volumes and is a compact binary format Prescribe Filename normally dyn exv and Output timestep h the interval how often the fields are stored o For storing illustrative statistics data products or outputting GIS files in BIL format go to Model Statistics Check output 2D fields and select parameters Prescribe time interval for GIS ouput when output BIL files is selected Running model o For running the model go to Model Run and either prescribe run time in hours N hours or when N hours is zero or negative dates for start and end of the simulation o When running the model animation can be updated more frequently than prescribed in the Animations option by pressing F3 key when OpenGl animation window is selected For other options see OpenGl menu in the animation window Initial state file o Go to Model Start end and dynamic fields o Specify the simulation start field in the up
10. l Grid depths o Select either Map graphical editing or Tabular table editing o In Map option select with mouse area and prescribe elevations o When Settings Relative depths in checked in the Map option the prescribed values will be added to the elevations This enables for instance easy dredging for a prescribed depth or definition of a road embankment to a prescribed height Observe that in the model elevations are negative Dikes gates and dike and dam breaks can be also prescribed through i Model Control structures and using either graphical or tabular editor ii GIS files or iii specific description files For the methods and input values see the model manuals for instance 123D EIA Model Manual At the moment graphical editor reads the controls but doesn t show them This is because the graphics interferes with other user interface functions The limitation is intended to be corrected in the future model versions 7 6 Combined 1D 2D 3D simulation For detailed instructions see 123D EIA Model Manual Below is only a rough outline o Set up the 1D model to accommodate the river and channel network change to RNetSetup user interface folder o Set up the 2D or 3D model that accommodates large rivers floodplains lakes reservoirs and coastal areas change to VIVSetup user interface folder o Define structures for both 1D and the 2D 3D models o Calculate grid combination file with the
11. must have calculated this flow field earlier It will override all flow boundary conditions and parameter values that are defined in the fld file o If you do not define an old flow field in the previous step the model will calculate the flow for each time step based on the input boundary conditions and model parameter values and then immediately calculate the concentrations of sediment and other variables for that time step 7 Setting up the 3D model for 6 typical case studies 7 1 Water quality Set the water quality variable and its parameter values o Go to Model Variables Either Edit or Add Prescribe variable name Code with 4 capital letters for instance SEDI Select Active Don t select affects density other than for SALI salinity and TEMP temperature These two parameters will affect the density and flow of water select sediment budget in case of sediment simulation when needed o prescribe Settling coefficient cm d Initial value mg l and Initial sediment value g m2 o For statistical output select 2d statistics o 3 water quality variables can be prescribed More can be prescribed by changing the model executable Set additional parameter values for oxygen OXYG o Go to Model WQ parameter and in case of land use data Model Land use related parameters and prescribe parameters Select time steps o Go to Model Time steps
12. per part of the dialog window Specify Type depending on the flow field file type The usual options are ascii EX V and aver bin Select then the Filename By default the flow file extensions are always exv o ascii EXV type specifies stored end state of a previous model run o aver bin type means that you want to use a situation from a dynamic calculation file dyn exv The file contains not only the end state of the simulation but also average fields over prescribed time period The file needs to be created by an earlier simulation The initial condition will be that start time which is defined under the button Computational time Using previously calculated flow field for water quality sediment erosion oil etc simulation o When using previously calculated flow field for sediment and water quality simulation select flow field type in Model Computational parameters Input The type should be same as your previous flow field type Usually aver bin should be selected as this preserves flow volumes and is a compact file format You prescribe the name of the input flow field in Model Start end and dynamic fields dialog in the Start field area When you use an old flow field the sediment or oxygen calculation is fast as you do not have to calculate the flow field again o The model will use the dynamic flow field for the time defined in Computational time But you
Download Pdf Manuals
Related Search