Quasi-3D numerical model has been widely used in the water flow modeling and water quality modeling ,but its significance in the river fluvial computation has not be fully realized .In this paper ,the quasi -3D hydrodynamics model and fluvial model used in the 3D model were combined .After the model calibration ,the model were then used to simulate the hydrodynamic and fluvial process in downstream of the Beiben power station .Results manifested that quasi -3D numerical model for the river dynamics shows great advantage than the 3D numerical model in the computation effi-ciency while retaining the capability for simulating the vertical distribution of the flow and sediment dynamics .The quasi-3D numerical model plays the irreplaceable role when the vertical distribution of the flow and sediment are needed while 3D was not feasible due to the computation efficiency .%近年来泥沙动力和河床冲淤三维计算模型(SB3D)取得了快速的发展,然而由于SB3D基于全三维水动力模型,计算量过大将会降低SB3D的工程实用性.从模型结构、模型求解与程序代码编译三个角度,探讨准三维水动力模型和SB3D联用的合理性和实用性,并采用实验室模拟和工程应用予以证明.结果表明:准三维模型多数条件下可以为SB3D提供合理的三维水流速度;全三维水动力模型和程序模块可以方便的由准三维模型和模块替换;准三维水动力模型极大的提高了模型计算效率,具有理想的"轻装"效应,可以提高SB3D的工程实用性.
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