Calculation of Flow and Sediment Transport in the Lower Yellow River Using CCHE2Dfvm Model

Abstract

In this study the depth-averaged 2-D model, CCHE2D fvm , is applied to calculate the flood routing and sediment transport in the 100km-long reach between Huayuankou and Jiahetan gauging stations in the lower Yellow River. The model solves the two-dimensional shallow water equations by using the finite volume method with the SIMPLE(C) algorithms and Rhie and Chow's momentum interpolation technique on a curvilinear, non-staggered grid. The sediment transport equations are also solved by the finite volume method. A semi-coupled procedure is used, in which the flow and sediment are calculated in a decoupled way but the three components of the sediment module: sediment transport, bed changes and bed material sorting are computed in a coupled fashion. The computations of the 1982 and 1996 floods show that the model is capable of efficiently simulating flow and transport of sediment with low and middle concentrations ( 3 ) in the widely wandering Yellow River with very complex topography and abruptly wetting and drying processes. The simulated flow discharges, water elevations and sediment discharges are in reasonably good agreement with the measured data.