太湖水动力学三维数值试验研究——3.马山围垦对太湖风生流的影响

地形地决定湖泊流场的大小和结构和重要因素，它会影响湖泊水体内的物质输移与扩散和水质的分布，因而弄清马山围垦对湖流的影响有助于了解无锡市重要饮用水水源地梅梁湖的藻类“水华”和水质变化规律，本文在太湖风生流的三 数值模拟的基础上，用数值试验方法探讨了马山围垦对湖泊流场的影响，结果表明：虽然围垦对表层及底层风生流影响较小，但是对中间转层的流场影响较大，对整层平均流场影响更大，在多数风场作用下，围垦虽未对

Three-dimensional Numerical Experiments on Hydrodynamics in Taihu Lake-3.Influence of the Reclaimation in Mashan Districton Wind-driven Current

Terrain is an important factor influencing the velocity and the distribution of water current in lake. It decides the substance transportation and diffusion in lake water. This induces the study on the influence of the reclaiming of Mashan District on wind-driven current to be important to know the change of water quality in Meilianghu Bay. The influences of the reclaiming of Mashan district on the wind-driven current were discussed on the base of the part 1 and part 2 of thre three-dimensional numerical experiment on hydrodynamics in Lake Taihu, China. The results showed that the reclaiming in Mashan district had few influences on the layer water current ex cept the conversion layer water current. As to the conversion layer, it has great influences on velocities and directions of the conversion layer water current and the vertical averaged water current. It decides the structure of the circulation formed by the vertical averaged water current near the Mashan District. In particular, in case there blows SW wind these kinds of influences are very strong, e.g. the reclaiment changed the flow direction and the location of the great-scale circulation in the west part of the lake, and restrained the water in the decreased the net water exchange rate between Meilianghu Bay and the open area of the lake by the reclaiment. Especially, in the case of SW, not only about 98 % of the net water exchanges were cut down, but also the waterexchanges on the layer blow surface layer, middle layer and the layer above the bottom layer were cut down in a relative high percentage.