When calibrate the model I have matched the simulated water surface elevation with observed water surface elevation by changing Manning’s coefficient of floodplain. The results are almost match from starting water level to reach peak level (rising limb of hydrograph) but when the water level reduces the simulated water level did not reduce as much as observed level reduces (falling limb of hydrograph). I shall be grateful if you could explain me what changes i have to do in the model to get close matching between observed and simulated during falling limb of hydrograph. Thanks in advance.
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There are various factors.
Riverbed deformation, roughness coefficient, downstream water level, drainage by small channels, seepage…etc
Please consider why there is a difference between the calculation and the local situation.
Thank you very much for the reply. I used roughness coefficient as a changing parameter for calibration. What would be the main reason among those you mentioned. because simulated water level matched with observed ones during simulating rising limb of hydrograph and the problem arises when simulating falling limb (discharge reduces from peak) of hydrograph. Your reply will be highly appreciated. Thanks in advance.
Hellow,
I don’t know what works best.
Because I don’t know the local situation of the river.
You should judge what works best.
Thank you very much for the reply.