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本实验根据流体力学和钉螺生态学理论,在配有循环水的玻璃水槽中,设计制作出由进水控制段、分离扩散段、沉降集中杀灭段、出流还原段组成的涵闸渠系钉螺截留系统(Oncomelania Stem-Stay System简称OSSS)模型。研究了改变流量、平均流速对钉螺截留的影响,分离扩散段对附叶钉螺的脱离率和截留率的影响。“采用模拟钉螺”对OSSS及其改良模型,在相同的水流条件下进行比较研究。结果表明:不加OSSS,钉螺和“模拟钉螺”全部冲向下游。而加OSSS,截留率均在98％以上,脱离率为97％。证明OSSS有良好的截留钉螺和使钉螺脱离载体的能力,而其中OSSS-1-3型较好,当相当原型流量0.93m~3/s,平均流速为15.4cm/S时,截留率可达99％。结果还表明OSSS具有不壅高水位,无需处理漂浮物,工程量小的优点。
In this experiment, according to the theory of fluid mechanics and snail ecology, in the glass tank equipped with circulating water, the design and manufacture of the culverts of the sluice slug consisting of the inlet control section, the separation diffusion section, the sedimentation concentrated kill section and the outlet reduction section Interception system (Oncomelania Stem-Stay System referred to OSSS) model. The effects of flow rate and average flow velocity on the retention of snails and the effect of separation and diffusion on the detached rate and the rejection rate of the snails were studied. “Using simulated snails” on OSSS and its improved model under the same water conditions for comparative study. The results showed that: without OSSS, snails and “simulated snails” all rushed downstream. And add OSSS, retention rates were above 98%, the detached rate of 97%. OSSS has a good ability to intercept snails and snails from the carrier capacity, OSSS-1-3 type which is better, when the equivalent prototype flow of 0.93m ~ 3 / s, the average flow rate of 15.4cm / S, the rejection rate up to 99%. The results also show that OSSS has the advantage of not having a high water level, no need to handle floats, and a small amount of work.