钉螺动水沉降及运动方式的实验研究

EXPERIMENTAL RESEARCH ON SUBSIDENCE AND MOTION PATTERN OF SNAILS IN CURRENT WATER

本实验研究运用水力学、泥沙运动力学和钉螺生态学理论,在取得钉螺静水沉降规律若干参数、公式基础上,采用循环水大型玻璃水槽进行试验,获得钉螺在流动水体中运动形式、方向、沉降、漂移等4种水力特征,并由外力平衡方程推导,经实测结果检验可行,得出钉螺动水沉降速度、距离两个实用公式.实验结果,为防止钉螺随水流扩散,采取“中层取水”、“沉螺池”等安全工程设计,提供了理论依据和实用计算方法.

In this research,we applied the theories of hydraulics,silt motion mechanics and snail e-cology in practice on the basis of some parameters and formulas of snail subsidence in static water. A big glass trough filled with circulating water was used to check 4 kinds of snail moving features in current water:i.e. ,the moving action,direction,subsidence and drift.A balance equation for calculating external force was used to infer two formulas about dropping speed and distance in current water. It demonstrated that these two formulas were available for calculation in the practical work. The results have provided theoretical basis and feasible calculation mathod for design of savety engineering, (such as 'dropping water in middle water'and 'dropping snail pool')aiming at prevention of snail spread.