宽浅水域风生流及床面冲淤数值模型

Numerical Simulation of Wind-Induced Current and Evolution of Bed Surface in Shallow Waters

给出了一个描述宽浅水域风生流及床面冲淤的数值模型。模型中采用静水压强分布等假设下的三维连续方程和动量方程作为宽浅水域中风生流的基本方程,用单方程紊流模式估计涡粘性系数,对常用的壁函数技术进行了改进。算例表明,计算得到的风生流流速垂线分布规律与现有的实例数据吻合良好。此外,模型中还考虑以推移质为主的泥沙运动,在具有矩形水平剖面的海湾中计算出风生流流场及伴随的床面变化。

A three dimensional model is presented which can be used to predict wind-induced current and evolution of bed surface in shallow waters.The wind-induced velocity and elevation of the free water surfce are solved based on the continuity equation and momentum equations with some approxi- mations such as the hydrostatic pressure distribution in the vertical.The energy-equation turbulence model is employed to compute the eddy viscosity coefficient.The computed wind-induced velocities are in agreement with the experimental data.Basides,the wind-induced current and evolution of bed sur- face are predicted,assuming that the bed load dominates the sediment transport process.