A 1-D and 2-D Coupled Sediment Transport Model Using the Immersed-Boundary Method

Implementing small-scale rivers and channels within large-scale background sediment transport simulation is challenging because of the significant resolution difference. The modeling requires coupling between the background model and 1-D channel model. Based on a previously developed coupling method for hydrodynamic simulation, in this paper, a novel immersed-boundary (IB) type coupling method is developed and implemented for the sediment transport simulation. This coupling method enables dynamic linking between the channel and background with a relatively simple manner, and improves the efficiency and accuracy of the sediment transport simulation as water exchanges between the channel and background occur during a flooding event.