instability in sub-daily routine SWAT+ 61.0.1

[Jerome El Jeitany]

Hello all, 

I am trying to run a sub-daily streamflow routing.

Pcp data is hourly, the modelled streamflow is also expected to be hourly.

Used routing method: variable storage with green-ampt infiltration model. 

my question is, i observe instability in the simulated streamflow. 

Could it be due to a numerical instability in the hourly routing ? (CFL number overshooting?)

the precipitation data seem quite coherent so i ruled it out.

Herein attached a figure to display how the streamflow shoots after the year 2009. 

this happens in almost every case (despite changing manning's, channel slope. etc). 

Thanks 

JJ 

[Fernando Gimeno]

Hello, i'v seen the same issue. 
Are the magnitudes of your simulation correct?

When changing the uhyd parameter in code.bsn and calibrating the parameters in paramter.bsn adj_uhyd and uhyd_alpha, it adjusted quite well, but I'm still having problems with the magnitudes of the simulated flows.

Were you able to solve it?

Best

[María Eugenia Borges]

Hi all,

I'm having the same issue with the flow magnitudes when I try to run the model to obtain sub-daily values. Have any of you managed to solve this problem?

Kind regards,

Maria