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引用本文:胡维平,秦伯强,濮培民.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.湖泊科学,2000,12(4):335-342. DOI:10.18307/2000.0407
HU Weiping,QIN Boqiang,PU Peimin.Three-dimensional Numerical Experiments on Hydrodynamics in Taihu Lake-3.Influence of the Reclaimation in Mashan Districton Wind-driven Current. J. Lake Sci.2000,12(4):335-342. DOI:10.18307/2000.0407
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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
胡维平, 秦伯强, 濮培民
中国科学院南京地理与湖泊研究所, 南京210008
摘要:
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.
关键词:  风生流  地形  围垦  太湖
DOI:10.18307/2000.0407
分类号:
基金项目:中国科学院"九·五"重点项目(KZ952-S1-220)和(KZ952-J1-212),"九·五"重大项目(KZ951-B1-205-02)和中国科学院"九·五"特别项目(KZ951-A1-301)联合资助.
Three-dimensional Numerical Experiments on Hydrodynamics in Taihu Lake-3.Influence of the Reclaimation in Mashan Districton Wind-driven Current
HU Weiping, QIN Boqiang, PU Peimin
Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008
Abstract:
Terrain is an important factor influencing the velocity and the distribution of water current in lake.It decides the substance transpo rtation and dif fusion in lake water.This induces the study on the influence of the reclaiming of Mashan Dist ricton wind-driven current to be impo rtant to know the change of water quality in Meiliang hu Bay.The influences of the reclaiming of Mashan districton the wind-driven current were discussed on the base of the part 1 and part 2 of thre three-dimensional numerical experimenton hydrody namics in Lake Taihu, China.The results showed that the reclaiming in Mashan district had fewinfluences on the layer water current except 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 g reat-scale circulation in the west partof the lake, and rest rained 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, notonly about 98% of the net water exchanges were cut down, but also the water exchanges on the layer blow surface layer, middle layer and the layer above the bottom layer were cutdown in a relative high percentage.
Key words:  Wind-driven current  terrain  reclaiming  Taihu Lake
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