|关键词: 太湖流域 1993年洪涝灾害 降雨和洪水特征 水利工程
|The 1993 flood disaster and the flood control benefit of water conservancy projects in Taihu Lake basin
Taiku Lake Basin Authorily, Minitry of Water Comrvancy, Shanghai 200434
|In the flood season of 1993, Taihu Lake reached its high water level of 4.51m, or the third highest one after 1949.Some areas of the basin were suffered from flood and waterlogging disaster.In this paper, the rainfall and flood regime, the comparison of rainfall and flood characteristics for typical flood years of 1993, 1991 and 1954 are illustrated.The flood and waterlogging disaster and the benefit of water conservancy projects are also analyzed.Rain season in the basin is from May to July.But in 1993, the temporal distribution of rainfall was unusual.The rainfall was concentrated in August and high water levels in rivers also appeared late in August.The spacial distribution of the rainfall was characterized by the follows: (1) The rainfall in the upper reaches was concentrated in the West Zhejiang mountain area;(2) The rainfall in Taihu Lake region was heavy;(3) The rainfall in the lower reaches was concentrated in Dianmao and HangJiahu regions.Water levels in the rivers of some hydrographic stations in Dianmao and Hangjiahu regions were higher than those in the heavy flood year 1991.Strong flood flow from the upper reaches,high rainfall intensity in the local area,low discharge capacity of the rivers in the lower reaches are the main causes of flood disaster.In order to improve flood control operation and harnessing plan, more researches should be done for some rainfall patterns and flood patterns of different typical flood years.
|Key words: Taihu Lake Basin flood disaster characteristics of precipitation and flood water conservancy project