感潮河段漫滩的数值模拟

Coupling Computation of the Flow and Tide of a River with a Low-lying Land

运用一维和二维不恒定流嵌套计算的方法，给出带有漫滩的感潮河道水流动的计算结果．当主河道的水位、流量发生变化时，河道中漫滩区的淹露也将随之而变．因此把整个计算域划分成三个子计算域，分别用明渠一维不恒定流方程和二维浅水方程描述其中的水流动状态，并分别划分计算网格，在数值计算中将三个区域的流动互相嵌套连贯起来，最终给出包括河道和滩地漫滩的水位变化规律及水流动速度分布规律．

a:The coupling computational method of one-two dimensional unsteady flow is applied to the flow of the tideland of a river with a low-lying land near the mouth. The calculating region is divided into three subregions. The grids of subregions are framed separately, and the flows in subregions are described respectively by one-dimension unsteady-stream equations and two-dimension shallow-water equations. Three flows are linked up in computing. The result obtained includes the level and flow velovities in the river course and its icly-lying land.