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Hello,

I have two related questions about the Wilcock and Crowe implementation in GAIA:

1. Are there plans to make the WCC variable (lines 71-72 in bedload_wilcock_crowe_gaia.f) "public" or changeable with a keyword in the dico?
2. In the meantime, or if the answer is no, what is the best way to implement any calibration of WCC? Should I copy bedload_wilcock_crowe_gaia.f to my user_fortran directory, change the value of WCC, and hope it overrides the default subroutine? Otherwise, what is the recommended path?

Thanks,
André Renault

Hello André,

1. At the moment there are no plans to make the WCC variable changeable with a keyword but I note your proposition/need and I will let you know.

2. As you say, if you want to change this coefficient the subroutine (a copy of bedload_wilcock_crowe_gaia.f with modified value) must be copied in your user_fortran directory.

Best regards,
Sara

To anyone interested in knowing more on the calibration coefficient (WCC):

I played with the WCC and if my understanding of the subroutine is correct, all it does is multiply the transport rate by a constant factor after all other calculations are done. For instance, a WCC = 2.0 will roughly double the speed of bed evolution (e.g. a change that used to take 60 minutes will take about 30 minutes). This is a simplification of actual results, but it is more or less what I observed in my testing. For some reason, I was expecting a nonlinear effect on sediment transport, but anyway.

Now I'm curious as to what influenced the inclusion of this coefficient, as it isn't really present in any literature I've seen on the subject!