隔水幕布改善深水水库下泄低温水效果研究

Effects of temperature control curtain on water releases in deep water reservoirs

深水水库的低温水效应明显,以往常采用叠梁门、多层取水口等结构解决下泄低温水问题,但此类方案需在水库投入运行前完成且会造成一定的发电损失。针对已投入运行但未设计建设分层取水设施的水库水温问题,本文提出了在电站进水口前设置隔水幕布的新型水库低温水治理方案,建立三维水动力水温数值模拟模型,模拟分析了隔水幕布改善水库下泄低温水的效果及其主要影响因素。模拟结果表明,隔水幕布可使春夏季水库下泄水温提高2~8℃,幕布型式、淹没水深和坝前水温分布是影响改善效果的主要因素;并基于上述结论提出了隔水幕布方案的下泄水温预测公式。隔水幕布改善水库低温水的效果良好,具有广泛的推广应用前景。

Stop log gate intake and multi-level orifice intake are often used to control the temperature ofwater releases in thermally-stratified reservoirs. However,these measures must be completed before the res-ervoir running and will cause some power loss. For those reservoirs which have been put into operation with-out selective withdrawal structures, a temperature control curtain set before intakes has been proposed. A3-D numerical model is developed to verify its validity and analyze the effect factors. The results show thatthe temperature control curtain can raise the temperature of water releases by 2~8℃ in spring and sum-mer. The degree of improvement is affected by the type,height of curtain and vertical temperature distribu-tion. Then,a temperature prediction formula of this scheme is put forward based on the above conclusions.The temperature control curtain has good effects and can be widely spread.