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1、MIKE 21 CMORPHOLOGICAL MODEL OF A U-FLUMETutorialMIKE 21 C MORPHOLOGICAL MODEL OF A U-FLUMEDHI Water & EnvironmentDHI Water & EnvironmentAgern All 11DK-2970 HrsholmDenmarkTel:+45 4516 9200Fax:+45 4516 9292E-mail:dhidhi.dkWeb:www.dhi.dk2002-06-21/U_FLUME_DESC/HGE/bgrCONTENTSDHI Water & EnvironmentiCO
2、NTENTS1INTRODUCTION .12BEFORE STARTING THIS TUTORIAL.32.1Files to start with. 33PROBLEM DEFINITION.54MODEL BATHYMETRY .75HYDRODYNAMIC HOTSTART SIMULATION.96SIMULATION OF HELICAL FLOW.126.1Results. 147SIMULATION OF BED LOAD, SUSPENDED LOAD AND MORPHOLOGY .167.1Results. 198FURTHER ANALYSIS.228.1Helica
3、l Flow . 228.2Effect of Bed Load and Suspended Load. 228.3Effect of Bed Slope. 229LONGITUDINAL PROFILE PLOTS.24MIKE 21 C MORPHOLOGICAL MODEL OF A U-FLUMEiiDHI Water & EnvironmentINTRODUCTIONDHI Water & Environment11 INTRODUCTIONThis tutorial describes the development of a morphological model of a cu
4、rved channel or river bend. The model is based on the curvilinear MIKE 21 C modelling system. The setup is of a U- shaped flume, which is extensively used at Delft University for studying river morphology and is subsequently described in a number of Ph.D theses and papers. Important parameters and d
5、ata files for the MIKE 21 C model are described and discussed in the following step by step tutorial.MIKE 21 C MORPHOLOGICAL MODEL OF A U-FLUME2DHI Water & EnvironmentBEFORE STARTING THIS TUTORIAL.DHI Water & Environment32 BEFORE STARTING THIS TUTORIAL.This is a tutorial and some of the files are pr
6、e-prepared. In particular, the curvilinear grid has already been generated. If you want to learn about creating a curvilinear grid using M21GG, see the M21GG tutorial. Further, MIKE 21 C uses the MikeZero model environment. It is assumed that you are familiar with this interface and are aware of the
7、 various file types used in MikeZero. In particular, references are often made to the Result Viewer, used to visualise model results.2.1 Files to start with There are only two files that you need to start this tutorial - the rest will be created. These files are the descriptions of bathymetry and th
8、e grid coordinates:! flume_bathy.dfs2 - This file contains the bed levels at each grid point.! flume_grid.dfs2 - This file contains the curvilinear coordinates of the grid.Use the Result Viewer to look at these files.MIKE 21 C MORPHOLOGICAL MODEL OF A U-FLUME4DHI Water & EnvironmentPROBLEM DEFINITIO
9、NDHI Water & Environment53 PROBLEM DEFINITIONModel development will follow the procedure:! Define the problem! Model Bathymetry! Create a HD hotstart simulation, which will provide initial conditions to the main simulation! Simulate helical flow! Simulate bed load and suspended load! Simulate morpho
10、logyMIKE 21 C MORPHOLOGICAL MODEL OF A U-FLUME6DHI Water & EnvironmentMODEL BATHYMETRYDHI Water & Environment74 MODEL BATHYMETRYThe model is a U-shaped flume (total length around 20 m), initially with a constant slope (0.35%), width (approx. 0.5 m) and depth (approx. 5 cm). The bed level varies from
11、 approximately -0.85 mm upstream to -118.8 mm downstream. The flume width is represented in the model with 5 grid points, where the first and last points describe the banks. This means that only three points describe the lateral flow (and sediment) distribution. In the longitudinal direction, there
12、are 140 points.The model geometry is shown below:The model geometry can be viewed in two ways. The first way is using the M21C Grid Generator (m21gg.exe, described in the m21gg tutorial) or in the Result Viewer within the MikeZero Interface. The model bathymetry is located in the file “flume_bathy.dfs2“. The model grid coordinates are located in the file “flume_grid.dfs2“. The “_curve“ suffix denotes a curvilinear grid.MIKE 21 C MORPHOLOGICAL MODEL OF A U-FLUME8DHI Water & EnvironmentHYDRODYNAMIC HOTSTART SIMULATIONDHI Water & E
