Abstract:

Objective To verify the impact of operation high water level on Oncomelania hupensis natural growth in the water diversion rivers of the east route of South?to?North Water Diversion Project. Methods The data of the daily mean water level were investigated in the stilling pool of Jiangdu Pumping Station during the water diversion under the emergency anti?drought, and the water level data of the previous year served as the control. The dynamic of natural growth of O. hupensis snails was observed before and after the high water level in the beach wetlands of the stilling pool of Jiangdu Pumping Station. The water level of emergency anti?drought was as simulation operation water level of the east route of South?to?North Water Diversion Project in the stilling pool, and then the effects of operation water level on O. hupensis natural growth in the water diversion rivers of the east route of South?to?North Water Diversion Project were studied. Results The altitude of the beach wetlands was 6.4 to 7.2 meters in the stilling pool of Jiangdu Pumping Station. The water diversion was 255 days continuously and the pumped water was 6.235 billion cubic meters in the Jiangdu Pumping Station from November 2010 to July 2011. There were 216, 136 days and 39 days when daily mean water level were more than or equal to 7.2, 7.6 and 8.0 meters during the water diversion, respectively. The snail densities were 0.856 snails/0.1m2 and 0.0153 snails/0.1m2 , respectively, before and after the No.3 beach wetlands flooded in the stilling pool of Jiangdu Pumping Station. The densities of living snails decreased by 98.21%, and there was no any progeny of snail. The snails were not detected in other environment of the stilling pool. Conclusion The operation high water level can effectively restrain snail breeding in the water diversion rivers of the east route of South?to?North Water Diversion Project.

Key words: East route of South ?to?North Water Diversion Project, Water diversion rivers, Schistosomiasis, Oncomelania snail, Water level

摘要：

目的 验证南水北调东线工程未来高水位运行对输水河道自然生长钉螺的影响。 方法 调查江都泵站应急抗旱调水期间消力池日平均水位， 并以上年同期水位为对照； 调查高水位运行前后消力池滩地自然生长钉螺动态； 以应急抗旱调水水位为东线工程模拟运行水位， 研究分析南水北调东线工程未来输水河道运行水位对钉螺生长的影响。 结果 江都泵站消力池滩地高程为6.4～7.2 m。自2010?11?20-2011?07?31连续抽调江水255 d， 抽调水量62.35亿m3 。调水期间江都泵站消力池日平均水位≥7.2 m为216 d， ≥7.5 m为161 d， ≥ 8.0 m为38 d； 而上年同期分别为77 、 60 d和16 d。江都泵站消力池自然生长钉螺的3号滩地在高水位淹没前最高钉螺密度为0.856只/0.1 m2 ， 连续淹没后钉螺密度下降为0.015 3 只/0.1 m2 ， 且未发现子代钉螺。调查消力池其他滩地也未发现钉螺。 结论 南水北调东线工程未来运行水位可有效抑制输水河道内钉螺繁殖。

关键词: 南水北调东线工程；输水河道；血吸虫病；钉螺；水位