Trap efficiency of an intake

Water and sediment flow are computed for an intake. A stationary situation is assumed, where the bed level changes are so small that they do not affect the geometry or the water velocity field. The computation is therefore divided in two:

1. Water flow computation
2. Sediment flow computation

The water flow computation is done first and the sediment flow computation afterwards. Each of the two computations has its own control file.

Input files

The input files for SSIIM 1 for this case are given below. To run the case, first download the "koordina", "koomin", "timei", "control.s" and "control.w" files. Copy the file "control.w" to "control". Then run the program and the water flow is computed. After it is done, the "result" file is written by the program. Then copy the "control.s" file to "control", and rerun the program. This computes the sediment flow. After the computation is finished, the resulting sediment concentrations can be seen from the graphics of the program. The sediment fluxes are written to the "boogie" file, and can be used to compute the grap efficiency.

koordina file
koomin file
control.w file
control.s file
timei file

Comments to input files

The "koordina" file enclosed above is made using the Grid Editor in SSIIM. Input data have been obtained from digitizing a contour map of the river. This produced a "geodata" file, which was read by the Grid Editor and provided graphical representation of the geometry to make a plan view of the grid. The "geodata" file was then also used to create the bed levels.

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This page was last updated: 13. August 2006