【作者】 张姝如；

【导师】 李世森；

【作者基本信息】 天津大学 ， 港口、海岸及近海工程， 2008， 硕士

【摘要】 近几年来浅水湖泊的水质污染形势日趋严峻。浅水湖泊的污染物质中,内源释放量占据了很大比例,故内源释放一直受到广泛关注。然而,内源释放是由底部沉积物的再悬浮引起的,在研究湖泊内源释放之前,首先应了解湖泊中沉积物的空间分布状况,才能准确地计算出在风生波流扰动下的内源释放总量。本文查阅了近年来国内外有关湖泊水动力数值模拟及沉积物分布情况的相关文献,利用三维MOHID风生流模型对太湖风生流进行了数值模拟。在此基础之上,引入SWAN风浪模块,通过三维MOHID泥沙模型,模拟了风生流及波—流共同作用下,梅梁湾东部沿岸的底部泥沙运动情况。三维模型平面离散采用有限体积法,垂向应用σ坐标变换,保证了浅水区域的良好分辨率。太湖风生环流的模拟结果与前人的研究成果相符。在此基础上建立的三维泥沙模型反映了梅梁湾地区的泥沙运动规律,为今后内污染源释放问题的研究提供了进一步的帮助。更多还原

【Abstract】 In recent years, the water quality of shallow lakes is becoming worse and worse. In shallow lakes, the dynamic release plays an important role in water pollution, so presently it is widely concerned. What’s more, dynamic release is caused by the re-suspending sediment which is at the bottom of the lake. So the spatial distribution of sediments in lakes must be realized firstly and then the dynamic release which is caused by the disturbance of wind-driven flow-wave can be accurately calculated.After consulting plenty of literatures about numerical simulation of shallow lakes, MOHID model is selected to simulate the wind-driven flow of Taihu Lake. On this basis, SWAN model is coupled into MOHID. With this coupled model, the sediment transport of Meiliang Bay is simulated with the wind-driven flow and with the wind-driven flow-wave. In 3D model, the horizontal momentum equations are discretized by the finite volume method, and the sigma coordinate is applied for vertical direction, so shallow water regions are well described.In this paper, the results about wind-driven flow simulation of Taihu Lake agree well with the previous researches. The principle of the sediment transport of Meiliang Bay is well described by the sediment simulation. The computational results can be helpful for further studying of dynamic release.更多还原