珠江南河道平面二维非恒定流水沙数值模拟

Two Dimension Numerical Modeling for Sediment Transport of Pearl South River

基于贴体正交曲线坐标系下沿水深积分的平面二维非恒定水沙数学模型对珠江南河道水沙运动和泥沙冲淤进行了数值模拟,在确定悬沙絮凝沉速时考虑了泥沙粒径、盐度、含沙量及水流紊动的影响,针对河口泥沙双向交换的特点,对泥沙冲淤函数Φ作了改进,对挟沙力级配公式进行了调整,改进了现有模型,并利用河段实测水文资料及原型观测数据对模型进行验证,结果表明,模型计算的沿程水位、流速分布和泥沙输移以及河床冲淤演变与资料符合较好。

Two Dimension numerical model for non-equilibrium sediment transport of Pearl South River is established under the boundary-fitted curve coordinate sysytem based on flow equation and equilibrium transport equation of suspension. The silt function φ is treated separately and the practical sediment carrying capacity is put forward according to the sediment and silt characteristics of the studied water area,The validity of the model is verified by the hydrographic data.