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钉螺受水底流冲击的被动间歇性滑动或滚动运动谓之起动。实验测得，闭厣起动流速为13．0～19．0cm／s，水泥定床吸附起动流速为37．50％～46．67％、25．0％～29．27％和30．95％～46．34％。表明钉螺吸附在坚固的床面上时，大部分钉螺起动流速在107cm／s以上。砂泥动床起动流速分别为30和50cm／s。
Oncomelania affected by the inflow of passive intermittent sliding or rolling motion that start. The experimental results showed that the initial flow rate of closed loop was 13.0-19.0 cm / s, the flow rate of cement fixed bed adsorption was 37.50% -46.67%, 25.0% -29.27% and 30.95% ~ 46.34%. The results showed that when the snails were adsorbed on a solid bed, most of the snail started to flow at a rate of 107 cm / s or more. Sand mud bed start flow rates were 30 and 50cm / s.