摘要
随着越来越多高坝工程的建成运行,伴随高坝泄水出现的溶解气体过饱和问题及其对鱼类的影响问题愈益突出。本文结合我国已建高坝泄水,开展了高坝下游总溶解气体(TDG)过饱和释放过程原型观测研究,表明高坝下游过饱和TDG的释放过程与水体紊动强度、水深、压强等有直接关系.利用原观结果对已有释放模型进行了验证和参数率定,修正了其中释放系数的估算公式,并采用此模型预测得到了金沙江某电站下游河段TDG沿程释放规律。结果表明在大江大河上,由于水深大,过饱和TDG释放相当缓慢,因此对鱼类的影响较小型河流大。
With more high dams built -up, the total dissolved gas（TDG） supersaturation caused by discharge from a high dana could deteriorate fish habitat. Field observations on release process of supersaturated TDG were carried out for some existing high dams in China. It is indicated that the release process is directly related to turbulence intensity, water depth and pressure. In the paper, a release model is validated with the parameters calibrated by the field data and a formula for estimating TDG release coefficient is proposed. This model was used to predict the supersaturated TDG release process downstream a high dam in the middle reach of Jinsha River. Results show that the release rate of supersaturated TDG is low in rivers of greater water depth and high pressure, where the effect on fish is more significant than that in small rivers.
出处
《水力发电学报》
EI
CSCD
北大核心
2010年第1期7-12,共6页
Journal of Hydroelectric Engineering
基金
国家自然科学基金项目(50579043)
关键词
水力学
过饱和TDG
释放系数
参数率定
高坝
hydraulics
supersaturation TDG
release coefficient
parameter calibriration
high dam
