Excessive Sediment Delivery Ratio in some channels
Osman Furkan TOKGÖZ
Hello.
When I check the model I built using SWAT+, the in-stream sediment delivery shown in the SWAT+ Editor Output Check comes out extremely high. Also, the amount of deposition is zero.
The recent versions 61.0.2 and the previous 61.0.1 had similar issues.
I am not a software developer, but I asked Gemini about the source codes and it gave me the following warnings:
In the file sd_channel_sediment3.f90:
ebank_t = (1000. * ... * vel_rch * slope) ** 2. * (1. - clay / 100.)
there is no critical velocity in this expression. Also, this formula produces very large results.
In the formula for critical velocity:
vel_cr = 0.293 * (sd_ch(ich)%d50) ** 0.5
vel_cr = 1.
the same variable is reassigned, so the first formula is effectively overridden.
In the file sd_channel_sediment.f90:
dep = 0. ! sd_ch(ich)%bedldcoef * ht1%sed
deposition is set to zero, and the formula has been turned into a comment.
It is clear that these parts are either incorrect or still under development. Could you recommend or share a version in which I can obtain more reliable sediment outputs?
Best regards.
-Osman