2.2.4. Model Simulation

In the model, it is assumed that M is set to Mmax as an initial condition of model simulation, and remains fixed at Mmax before the start of the first flood event. Then, flood event i with a flow rate exceeding Qc erodes the mass Mf i,model, which is estimated by Equation (2), into the water column. During the flow recession, Mcap is limited below Mmax, and as the flow rate recedes, Mcap increases. In the case of another flood event occurring before the flow rate recedes below Qc, additional sediment re-suspension occurs, which also can be estimated by Equation (2). In the case that the flow rate recedes below Qc, sediment particles can accumulate in the pore space of the sediment bed up to the maximum capacity Mmax, where the accumulation rate is limited by the available mass of fine sediments in the water column. The model estimates the mass of fine sediment storage and re-suspension during the repeated cycles of flood events.
