关键词: 三峡建坝, 水位变化, 钉螺分布, 血吸虫病流行

Abstract: Objective:To investigate the influence of the variation of Changjiang water level in Anhui province after the building of the Three Gorges dam on the snail distribution and epidemic of schistosomiasis.Methods:Calculating the variation of water level at Tiemao islet of Tongling county according to the data of water level presented by the Changjiang committee of water conservancy,and investigating the snail distribution and human activities in different altitude beaches.Results:After the building of three gorges' dam,the water level will rise between Jan.and Apr,change hardly between May and Sept,and descend between Oct.and Dec;the time of water retreating in fall will be earlier.The snails are distributed on the beach of all altitude,and people's activities are mainly on the lower and upper altitude parts of the beach.Conclusion:The variation of water level due to the building of the Three Gorges dam will lead to transmission of snails in the lower altitude beach,and increase people's chance and time of water contact.