均质透水丁坝二维水流模拟研究

Research on two-dimensional flow simulation for homogeneous permeable spur dike

透水丁坝具有一定的透水率,其坝头水流分离程度、坝头局部冲深相比于实体丁坝要小,此外坝体的孔隙为鱼类和其余水生生物提供了栖息环境,对环境保护起到积极作用。为模拟均质透水丁坝平面二维水流运动,文章基于正交曲线贴体坐标系下平面二维水流数学模型,引入通度系数的概念考虑丁坝的透水率,并对考虑通度系数后的方程进行离散和求解。采用已有的水槽试验资料,进行了初步验证,模拟透水丁坝作用后的流场和水位场,结果表明计算和实测符合较好。

Compared to spur dike,permeable spur dike with a certain degree of permeability has a smaller dike head flow separation and local scour depth. Moreover,permeable spur dike plays a positive role in environmental protection because the dam pores provide a habitat environment for the fish and other aquatic organisms . The mathematical model of the two-dimensional flow in the orthogonal curve-fitted coordinate system was used in this paper to simulate the two-dimensional flow of a permeable spur dike. The concept of the block up coefficient was introduced to consider the permeability of the spur dike,and the equations with block up coefficient were discretized and solved. Using the existing flume experimental data,a preliminary identification was conducted to simulate the flow field and the water level field with the effection of the permeable spur dike. The results show that the calculation coincides well with the actual measurement.