本文观测了藁杆双脐螺静水沉降状态和沉速。结果表明,尽管藁杆双脐螺壳形呈薄圆柱体状的特征,但采用了螺口朝上、螺口朝下和螺体平放3种方式将藁杆双脐螺投入水中后,其基本呈水平状态盘旋下沉。本文对藁杆双脐螺相关参数如螺体的体积、螺体沉降承受阻力面面积、螺体的阻力形状校正系数以及螺体沉降阻力系数等方面进行了较详细的阐述,推导并建立了藁杆双脐螺在静水中的沉降公式。该公式理论基础可靠,物理意义明确,结构简单,便于应用。经统计学检验,公式计算值与实测值无显著性差异,具有实用价值。藁杆双脐螺静水沉速公式的建立,为深入研究藁杆双脐螺扩散并为今后采取水利防控措施打下了良好的基础。
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The Establishment of Hydrostatic Velocity Formula of the Biomphalaria Straminea
MIN Fengyang,WANG Jiasheng,ZHOU Jianyin,ZENG Kai
(Changjiang River Scientific Research Institute of Changjiang Water Resources Commission,Wuhan Hubei Province 430010)
Abstract:In this paper,the Biomphalaria straminea's hydrostatic settling velocity is measured by the settlement tube method.The result shows the hydrostatic settling velocity of Biomphalaria straminea is 2.32-12.92cm/s and there aren't significant difference between the different sizes of the snails.Then,the hydrostatic settling velocity formula of the Biomphalaria straminea is proposed by sediment mechanics theory and four parameters are detailed discussed for the formula.The theoretical basis of this formula is reliable,and the calculated values have no significant difference with the measured values of the Biomphalaria straminea's hydrostatic settling velocity.Thus,it provides the basis for taking water conservancy measures to control Biomphalaria straminea spread in the future.
Key words:Biomphalaria Straminea;Hydrostatic Settling Velocity;Hydraulic Characteristics
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