Author(s): Yang Bai; Jennifer G. Duan
Linked Author(s): Jennifer G. Duan, Yang Bai
Keywords: Unsteady flow; Sediment transport; Vegetation; Channel network; Numerical model
Abstract: This paper presents a one-dimensional model for simulating flood routing and sediment transport over mobile alluvium in a vegetated channel network. The modified St. Venant equation together with the governing equations for suspended sediment and bed load transport are solved simultaneously to obtain flow field and sediment transport rate. The Godunov-type finite volume method is employed, and the flux terms are discretized by using the upwind scheme. Then, the Exner equation is solved for bed elevation changes. The non-equilibrium sediment transport algorithm is used to simulate sediment transport. The influence of vegetation on floodplain and main channel is accountedfor by adjusting the resistance term in the momentum equations and shear stress in computing sediment transport capacity. The model is tested by an unprecedented flood event occurred in the Santa Cruz River, Tucson, Arizona, in July 2006. Simulated results of flow discharge and bed elevation changes show satisfactory agreements with the measurements.
Year: 2013