河道整治工程适应性及其二维有限元数值初步计算分析

Two-dimensional finite element analysis on river channel control works adaptability

采用二维非恒定水流泥沙有限元数学模型 ,研究了某多沙大河下游宽浅游荡型河段现有控导工程对水沙条件的适应性 ,通过对冲淤、水位、流速大小等值线、流场分析、河势以及水流平面形态等物理量的分析表明 ,在少沙条件的水沙系列下本段河道以冲刷为主 ,多数按规划治导线布设的控导工程发挥了护滩和控制主流和河势的作用 ,有些控制效果差 。

Two dimensional finite method is used to simulate the movment of water and sediment. On the basis of this simulation, adaptability analysis of river channel control works to water discharge and sediment discharge is made. The calculation results on river bed deposition and erosion, water levels, flow fields, contours of velocity and main flow indicate that the river bed will be eroded at the condition of low sediment, and most of works can control main flow and have the action of protecting river banks, and some works have little effect. In order to control the main flow effectively, research of how to arrange works still be made as soon as possible.