The format of the decay factor can be specified as
· Constant (in time)
· Varying in time
For the case with time varying decay rate you have to prepare a data file containing the decay rate. The data file must be a time series file (dfs0). The data must cover the complete simulation period. The time step of the input data file does not, however, have to be the same as the time step of the hydrodynamic simulation. A linear interpolation will be applied if the time steps differ.