河滩人工湿地对河流洪水位影响的数值模拟

运用计算水力学的基本理论，采用二维水流数学模型进行河流泄洪能力的数值模拟，借助于SMS地表水软件，分别模拟了河流在不同湿地面积、湿地宽度及不同植物糙率条件下，河流洪水位的抬升情况。结果表明，不同湿地宽度对泄洪水位的影响，最终归结为主槽宽度的变化对泄洪水位的影响。主槽宽度相对于湿地面积及植物糙率，对洪水位的抬升影响较大，且主槽宽度越小，水位涨幅越大。对于在河流中如何布置和种植人工湿地及湿地植物的选取具有一定的指导作用。

NUMERICAL SIMULATION OF INFLUENCE OF RIVERSIDE CONSTRUCTED WETLAND ON RIVER FLOOD LEVEL

Based on the fundamental theory of computing hydraulics and the two-dimensional mathematical model of water flow,a numerical simulation of river flood carrying capacity was carried out.Using SMS(Surface Water Modeling System) software,the fluctuation range of flood level was simulated respectively,when the wetland was of different area,width and vegetation roughness coefficients.It is showed that the variation of the wetland width,which led to flood level fluctuation,could be finally summarized to the variation of the river channel width.And the variation of the channel width has more significant influence on the fluctuation of flood level than that of wetland area and roughness coefficients of wetland vegetation.Also it can be concluded that the narrower the width of the channel is,the higher the flood level rises.Certain suggestions were provided for the arrangement of wetland and the selection of wetland vegetation in rivers.