静态温度分层水体中点源羽流云团垂向运动规律

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。

Vertical motion characteristics of thermal in static thermal-stratified water

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.