摘要
为了了解河道入流污染物在温度分层水库中的输移和扩散,采用概化模型试验对温度分层水库中异重流的运动特性进行了研究。通过设计水循环和加热方式成功模拟了水库温度分层环境,观测到异重流在运动过程中从底坡分离而进入水库中层沿水平方向运行的现象——间层流,对比分析了均匀、弱分层以及强分层水体情况下的异重流发展运动过程。对不同工况下的试验数据进行回归分析,得到表征水库分层强度的分层稳定度和浮力频率与异重流分离点水深、间层流厚度的关系。试验结果为大型物理模型研究提供了借鉴,且可以用来指导实际分层水库的运行和调度。
The kinematic characteristic of density flows in temperature stratified reservoir is experimentally studied using a generalized model,in order to study the transport and diffusion of inflow pollutants.The successful simulation of reservoir stratification is achieved through the designed water circulation and heating method.The phenomenon that density current separates from the bed slope and propagates horizontally into its equilibrium layer,namely interflow,is observed,and the development process of density current in uniform,weak and strong stratified water body is analyzed comparatively.Through regression analysis of experimental data of different cases,it is showed that the stratification stability and buoyancy frequency,which represent reservoir stratification,are closely related to separation depth of density current and interflow thickness.The experimental results offer reference to future experimental investigation and large-scale physical model and can guide operation and scheduling of stratified reservoir in practice.
出处
《人民长江》
北大核心
2011年第13期51-55,共5页
Yangtze River
基金
中央级科研院所公益基金项目"分层环境下污染物输移影响因素研究"(ZX200809-02)
关键词
分层水库
异重流
间层流
试验研究
stratified reservoir
density current
interflow
experimental investigation
