中层取水防钉螺拦网的研究
China Tropical Medicine(2012)
Abstract
目的评价中层取水拦网防止钉螺扩散效果、作用机理和费用-效益。方法采用现场试验、纵向观察和卫生经济学方法评价中层取水拦网防止钉螺扩散效果,进行防螺原理和费用-效益分析。结果重复2次中层取水拦网防螺试验结果均表明其拦(防)螺效果达100%。拦网取水口中心流速达0.88~1.00m/s,而拦网上部非过水断面流速为0.10~0.30m/s。现场应用表明在设置拦螺网后目标保护区的灌区渠系未查出钉螺。费用-效益分析表明中层取水拦螺网净效益费用比为1.43。结论中层取水拦螺网具有显著的防螺效果和优良的效益费用比,完全满足水利要求;其作用机理除中层取水原理外,还与拦网具有的透水性及防螺罩等特殊结构有关。
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Key words
Blocking network for snails via collecting water from middle layer,Cost-benefit,Oncomelania snail,Schistosomiasis
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