钉螺和螺卵静水沉降及运动方式的实验研究

本文应用水力学、生物学相结合理论，采用常规空气排水法，比重试验法分别测定钉螺、螺卵的重率；运用物体自由沉降及竹节置螺方法，对钉螺静水沉速及运动方式进行实测；观测。试验结果，获得钉螺、螺卵基本力学性质的几个物理指标值，即：活钉螺，螺卵的平均重率分别为１．８０ｇ／ｃｍ＾３，２．２９ｇ／ｃｍ＾３，钉螺，螺卵静水沉速的平均值范围在２．２２－１３．８９ｃｍ／ｓ之间；并建立计算钉螺，螺卵静水沉速的４个实用公式

EXPERIMENTAL STUDY ON SNAIL AND ITS EGG DROPPING MOVEMENT IN STABLE WATER

The biological and physical characteristics and parameters of movement form,direction and dropping speed in stable water were obtained for the snail, Oncomelania hupensis, with the test of dropping tube and large sample bottle. The theoretic basis of the study is combination hydraulics, silt movement mechanics and the snail biology. The results are as following: 1) The average specific gravity of live snail is 1.8g/cm3. 2) The average specfic gravity of snail egg is 2.29g/cm3. 3) The range of average value of dropping speed of the snail and its egg is from 2.22 to 13.89 cm/s.Meanwhile, four practice formulas of dropping speed of the snail and its egg were developed based on measured data and Newton formula of rounding current block. The resulats would lay a foundation for study of preventing the snail spread and also provide the calculating method and practice parameter for design projeet which will prevent snail from spreading.