水温分层对水库污染物输移的影响

水库温度分层使水库水动力特性及污染物输移过程异于均温型水库.采用三维非线性RNG浮力流模型对分层水库污染物输移的典型过程进行模拟,分析了水体分层条件对污染物输移的影响,探讨了不同分层条件下污染物在不同密度流流动区域射流区、交换区、潜流区的输移扩散规律.研究结果表明,水库分层条件对污染物输移有显著影响,污染物输移的分离点水深、交换区厚度、无量纲时间参数与水库分层强度成反比.研究结果可为水库水质、水生环境管理与调度、水库应急预警方案的制定提供参考.

Impact of stratification condition on reservoir pollutant transport

The thermal stratified reservoir is different from the the average temperature reservoir on the hydrodynamic characteristics and the transportation process of the pollutants.The typical process of contaminant transporting in stratified reservoir was simulated by the nonlinear RNG anisotropic buoyant turbulence model proposed;the rules of contamination mixing and transport in various flow regimes of stratified reservoir are analysed.Results show that reservoir stratification conditions have significant effect on the pollutant transport process.The depth of separation point,the thickness of exchange zone and the dimensionless time parameter were inversely proportional to stratification condition.The results can facilitate the contamination control and provide useful information for water quality management.