Greetings,

I'm experiencing the same issue with the Sediment Transport module when using the "Mixture" option. Specifically, the erosion outputs always remain at zero, despite extensive trial-and-error testing with various erosion rates and sediment size classes.

We've tested scenarios with very fine sediment and ensured ample sediment availability for erosion. While the model does output bed load transport, we’re unable to associate it with any actual erosion process in the results.

Additionally, we haven’t been able to get the eroded sediment to resuspend and affect the total suspended solids (TSS) concentration, as it does when using the "Uniform" option.

We do observe changes in the mean grain size (Dm), bed composition, and bed load transport in the model results. However, we’ve been unable to relate these changes to active erosion processes or to increases in suspended sediment concentration — at least not for the sediment class with the same diameter as the suspended fraction.

Could you please advise what might be causing this or if there are any specific parameters or settings we might be overlooking?

Thank you in advance for your help.