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我省疫区湖泊密布,沟渠纵横,涵闸众多,钉螺沿水系分布面积广。涵闸引洪灌溉导致钉螺扩散相当严重。据报道,小型渠底涵管对防止钉螺扩散有一定的作用,为观察大型倒虹吸管的作用,我们于1988—1989年对潜江市张义咀斜管式倒虹吸管进行了实验观察。 倒虹吸管基本情况 倒虹吸管垂直穿过160m宽田关河河床底部,呈“”形,有4孔涵管上连荆么河,下接西荆河,管首有4个闸门控制水流,每个闸孔高2.85m,
In our province, there are many lakes in the epidemic area, numerous ditches and channels, numerous sluices and snails along the river. Culvert flood irrigation lead to snail spread is quite serious. It has been reported that the small canal culvert has a certain effect on preventing the spread of snail. In order to observe the effect of large inverted siphon, we conducted an experimental observation on the inclined tube inverted siphon of Zhangyi Tsui from 1988 to 1989. Inverted siphon basic situation Inverted siphon vertically through the width of 160m wide Tian River bed bottom, was “” shape, with 4 hole culvert even connected Jing River, then the West River, the first 4 gate control flow, each gate Hole height 2.85m,