How to simulate the change of river bed?

Hi, I want to simulate the river bed change, in the sediment model, I just want to use only the cohesive sediment, can you tell me how to achieve it? thank you.

Guidance on the sediment functionality in EE is provided in our Knowledge Base here: You should initialize the cohesive sediments but uncheck the “Simulate Non-Cohesives” shown in Figure 1, or set the number of non-cohesives to 0. You can turn on bed morphology as shown in Figure 5.