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地形是决定湖泊流场的大小和结构的重要因素 .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维数值模拟的基础上 ,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 ,但是对中间转换层的流场影响较大 ,对整层平均流场影响更大 .在多数风场作用下 ,围垦虽未对太湖南部水域的整层平均流场产生明显影响 ;但在某些风场如西南作用下 ,围垦却引起了梅梁湖和竺山湖的整层平均流场结构和大小的巨变 ,并严重影响梅梁湖与大太湖水量的净交换 ,制约梅梁湖及竺山湖与大太湖的水量的交换 ,对梅梁湖湾顶水质造成不利的影响 .
Topography is an important factor that determines the size and structure of a lake’s flow field, which affects the transport and diffusion of material and the distribution of water quality within the lake water body, and clarifying the impact of Mashan reclamation on lake flow will help to understand the important drinking water in Wuxi Algae “bloom” and water quality variation of Meiliang Lake in water source area.Based on the three-dimensional numerical simulation of wind flow in Taihu Lake, this paper discussed the effect of Mashan reclamation on the lake flow field by numerical experiment.The results show that: Although the reclamation has little effect on the surface wind flow and the bottom windward flow, it has a greater impact on the flow field of the intermediate conversion layer and more on the average flow field of the whole layer. However, in some wind farms, such as the southwest, the reclamation caused a great change in the mean flow field structure and size of the entire Meiliang Lake and the Zhuhushan Lake, and severely affected the impacts of Meiliang Lake and The net exchange of water in Tai Tai Lake restricts the exchange of water between Meiliang Lake, Zhu Shan Lake and Tai Tai Lake, adversely affecting the water quality at Meiliang Bay.