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SOBEK 3, D-Flow 1D, User Manual
Figure 3.24: Output options in the Properties Window
Now, for this tutorial, change the definition from Depth to Waterlevel, then set its Default value
to “1”. Note that in the Project <initial water depth> has now changed to <initial waterlevel>.
Leave the initial water flow as it is.
3.10
Model parameter settings
Some parameters need to be set before a model run. By selecting Project <Flow 1D>, the
simulation settings for the model appear in the Properties window. There are several parameters, which can be edited, but the most important are StartTime, StopTime and TimeStep. The
parameters StartTime and StopTime define the simulation period. The parameter TimeStep
defines the maximum time step with which the simulation is performed. Whenever and wherever in the schematization the numerical scheme requires a smaller timestep to ensure computational stability, the program will reduce the timestep as necessary. Please note that the
automated reduction of timestep is only done to prevent model crashes. Based on the modelled hydrodynamic phenomena, users should select appropriate space-steps as well as an
appropriate timestep to ensure that the hydrodynamic phenomena involved are computed with
sufficient accuracy.
Now, to follow this tutorial, set the simulation period to 3 d by adjusting <Start time> and
<Stop time>. Set the <Time step> to 1 h.
3.11
Set output
Left-click on Project “Flow 1D/output”. The Properties Window now shows all possible output options, see Figure 3.25.
Choose the following output parameters and set the output value on “Current”:
Grid points: Water level
Reach segments: Discharge
Reach segments: Velocity
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