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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6.4～7.2m。自2010-11-20-2011-07-31连续抽调江水255d,抽调水量62.35亿m3。调水期间江都泵站消力池日平均水位≥7.2m为216d,≥7.5m为161d,≥8.0m为38d;而上年同期分别为77、60d和16d。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/0.1m2,连续淹没后钉螺密度下降为0.0153只/0.1m2,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。
Objective To verify the effect of the future high water level operation of the Eastern Route of South-to-North Water Diversion Project on the natural growth of snails in watercourse. Methods The average daily water level of the stilling pool during the period of emergency drought control and water diversion in Jiangdu Pumping Station was investigated and compared with the water level in the same period of the previous year. The natural growth of snails was observed before and after high water level operation. Run the water level to study and analyze the influence of the water level of the water conveyance channel of the South-to-North Water Diversion Project on snail growth in the future. Results Jiangdu Pumping Station Sediment pond beach elevation of 6.4 ~ 7.2m. Since 2010-11-20-2011-07-31, the river water is continuously transferred for 255 days, pumping water amounting to 6.235 billion m3. During the water diversion period, the average daily water level of the stilling pool at Jiangdu Pumping Station was ≥7.2m ≥ 216 days, ≥7.5m = 161 days and ≥8.0 meters was 38 days. The same period of the previous year was 77,60 days and 16 days respectively. In Jiangdu Pumping Station, the highest density of snails of natural snails No.3 in submerged pool was 0.856 /0.1m2 before submerged in high water level. The density of snails decreased to 0.0153 /0.1m2 after consecutive inundation, and no onspring snail was found. No other snails were found in other shoals in the pool. Conclusion The future operation of the water level of the Eastern Route of South-to-North Water Diversion Project can effectively inhibit the snail multiplication in the waterway.