Y形交汇口冲淤特性的数值分析

A Numerical Analysis of Scouring and Silting Characteristics of Y-Shaped Junction

以Y形交汇口水沙运动为研究对象,利用平面二维水沙运动数学模型,对河床冲淤进行了模拟。通过水位、流速、流场、河底高程模拟值与物理试验值的比较,表明所建立的二维水沙模型能够较好的模拟Y形交汇口的水沙运动,分析得出河床冲淤特性随汇流比、交汇角和河床高差的变化规律。研究结果可以完善交汇河道冲淤理论,也可以用于指导河道整治、河网和河道设计等领域的实际工作。

Based on the Y-shaped junction water and sediment movement, the mathematical model of the two-dimensional water-sediment movement is used, and the river bed erosion and siltation is simulated. By comparing the simulated values of water level, velocity, flow field and river bed level with physical experiment values, the results show that the established two-dimensional water-sediment model can simulate the water-sediment movement of the Y-shaped junction well. It analyzes and obtains the scouring and silting characteristics of river bed varying with the confluence ratio, junction angle and river bed height difference. The results can be used to improve the interchange of river channel scouring and siltation theory, which can also be used to guide the river regulation, river network and river design and other fields of practical work.