水利学报2018，Vol.49Issue(4)：501-511,11.DOI:10.13243/j.cnki.slxb.20171232
应用PTV粒子追踪测速技术的鱼卵运动试验研究
Experimental research on fish eggs' movement using particle tracking velocimetry technique
摘要
Abstract
The study of fish eggs' movement is a mechanical basis for understanding the rule of fish eggs'drifting and dispersing in natural rivers.It is of great significance in the estimation of early-stage fish abundance,the evaluation of spawning ground location and the ecological restoration of fish habitat.In order to reveal the characteristics,the main impact factors and impact mechanism of fish eggs' movement under the steady uniform flow in open channel,20 groups of flume experiments with varying water depths and velocities were carried out and 200 videos of fish eggs' movement (eggs' diameter=4mm,specific gravity=1.01)were recorded and processed by particle tracking velocimetry (PTV) technique,a theoretical derivation of eggs' movement equations was also performed in this paper.The results show that the main impact factors of fish eggs' movement are the flow velocity,the fish eggs' specific gravity,the eggs' diameter and the egg'initial velocity.The eggs' longitudinal velocity is linear increasing with the increasing flow longitudinal velocity and the fitting linear coefficient is 0.73 which meant the eggs' longitudinal velocity is about 0.73 times to the flow longitudinal velocity.The eggs' vertical velocity is mainly affected by the eggs' specific gravity and diameter,and has no significant relationship with the flow longitudinal velocity.In the lower velocity condition,the trajectories of eggs' movement had a linear decrease trend and the slope of trajectories slowed down with the increasing flow velocity.When the velocity increased to 0.93 m/s,the trajectory changed from simple linear sinking to the wave-and-roll type sinking,and some individual eggs jumped suddenly.The impact of flow depth on the eggs' velocity and trajectory is relatively small.The effect of eggs' initial velocity on the eggs' longitudinal vertical velocities were only in the initial short time.关键词
鱼卵运动/水槽试验/理论推导/PTV技术/影响因素/作用机理Key words
fish eggs' movement/flume experiment/theoretical derivation/PTV technology/impact factors/impact mechanism分类
资源环境引用本文复制引用
刘雪飞,林俊强,彭期冬,余康,陈永灿,庄江波..应用PTV粒子追踪测速技术的鱼卵运动试验研究[J].水利学报,2018,49(4):501-511,11.基金项目
国家自然科学基金面上项目(51579247) （51579247）
国家自然科学基金青年项目(51409280,51509262) （51409280,51509262）
中国长江三峡集团公司科研项目(0704132) （0704132）
