摘要
水流输送钉螺同水流输送泥沙一样,是一种复杂的力学过程。本文分析了钉螺在流水中沉降运动的主要作用力及其平衡条件。在水流紊动强度不太大(Re<4×10 ̄4)的情况下,可略去竖向脉动分速的影响,钉螺在流水中以等速直线运动形式下沉,据此导得钉螺动水沉速的理论公式。通过水槽试验,对公式进行了检验,并确定其中的主要参数──动水沉降阻力系数。
As sediment particles in suspension,snails(oncomelania hupensis)are transported in riversand canals,however,their transportaiton mechanism is a complex process of mechanics.This paperanalyzes the main action forces and their equilibrium conditions in the process of snails settling. In thecase of lower turbulence intensity(Reynolds number is less than 4 ×10 ̄4),vertical component of tur-bulence may be reglected to make snails in waterflow settle in form of straight-line epuivelocity movement.Through flume experiment,examination of the formula is made and main parameters,drag co-efficient of settlirig in flowing water are determined. Basic relationship of settling theory in flowing water recommended in this paper and the formuladerived by it may also give a reference to studying movement of river sedimentation.
出处
《长江科学院院报》
CSCD
北大核心
1994年第1期62-68,共7页
Journal of Changjiang River Scientific Research Institute