静态温度分层水体中点源羽流云团垂向运动规律  

Vertical motion characteristics of thermal in static thermal-stratified water

作　　者：陈铂[1,2] 彭梦辉 王华 CHEN Bo;PENG Menghui;WANG Hua(School of Hydraulic Engineering,Changsha University of Science&Technology,Changsha 410004,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410004,China)

机构地区：[1]长沙理工大学水利工程学院,湖南长沙410004 [2]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410004

出　　处：《水利水电科技进展》2020年第1期37-41,80,共6页Advances in Science and Technology of Water Resources

基　　金：湖南省教育厅科学研究项目(15B012);国家留学基金湖南省地方合作项目(201608430149)

摘　　要：为了解水温分层型水库中瞬时点源污染物的运动规律,通过物理试验研究了点源羽流云团在静态温度分层水体中的垂向运动规律。试验结果表明:不同水温结构水体中,羽流云团的运动规律有着显著差异;线性分层水体中,云团沉降时横向扩散受到一定限制;有温跃层存在的水体中,云团会在温跃层位置停滞,由于云团与环境水体密度之间的差异,可能出现Rayleigh-Taylor不稳定或双扩散对流,并出现指状侵入;云团垂向沉速与所受浮力正相关,与云团前锋位置和浮力频率负相关。To understand the movement characteristics of a sudden point-source pollution in thermal-stratified reservoirs,the vertical movement of the thermal in the static thermal-stratified water was studied by experiment.The results show that the motion of the thermal is significantly different in water bodies with different temperature structures.The horizontal diffusion of the thermal is damped in linear stratified water.If the thermocline exists in the stratified water,the thermal can be retarded at the thermocline.Due to the density difference between the thermal and ambient water,Rayleigh-Taylor instability or double-diffusion convection may occur,and a finger-shaped intrusion can emerge.The vertical velocity of the thermal is positively correlated with the buoyancy but is negatively correlated with the cluster forward position and the buoyancy frequency.

关 键 词：点源羽流云团 污染物扩散 温度分层 垂向运动 沉速 

分 类 号：TV131.2[水利工程—水力学及河流动力学]