梯级调度影响下河段动态纳污能力变化及其水文过程响应  

Changes of Dynamic Permissible Pollution Bearing Capacity and Hydrological Processes Response Under Influence of Cascade Scheduling

作　　者：闫峰陵[1] 樊皓[1] YAN Feng-ling;FAN Hao(Changjiang Water Resources Protection Institute,Changjiang Water Resources Commission,Wuhan 430051,China)

机构地区：[1]长江水利委员会长江水资源保护科学研究所,湖北武汉430051

出　　处：《水电能源科学》2023年第8期39-42,14,共5页Water Resources and Power

基　　金：国家自然科学基金项目(41301285);水利部公益性行业科研专项(201001006)。

摘　　要：设计水文条件是影响水域纳污能力的重要因素,水电工程建设一般会显著改变河流原有水文过程。根据金沙江攀枝花河段水功能区划及水质目标,采用二维水动力、水质模型计算梯级建设前后COD、氨氮动态纳污能力,分析纳污能力受梯级开发的影响程度及其与相关水文要素的响应关系。结果表明,梯级建成后,COD、氨氮各月纳污能力分别减小5.2%~27.8%、3.8%~41.2%,枯水期减小幅度大于丰水期;各水文要素中,岸边流量与纳污能力变化趋势基本一致,利用梯级建设前后二者变化量进行相关分析,氨氮纳污能力变化量与岸边流量变化量显著相关,COD纳污能力变化量与岸边流量变化未表现出明显线性相关性。As an essential influencing factor of permissible pollution bearing capacity,hydrological condition was changed significantly due to hydropower cascade development.According to the water functional division and water quality control target in Panzhihua reach of Jinsha River,the variation of dynamic permissible pollution bearing capacity(COD,NH 3-N)with hydropower cascade development were calculated depending on 2-D hydrodynamic and water quality models.Furthermore,response relationship between permissible pollution bearing capacity and hydrological factors was established to evaluate the effect of hydropower cascade.The results show that the dynamic permissible pollution bearing capacity of COD and NH 3-N decreased by 5.2%-27.8%and 3.8%-41.2%,respectively,and its decreased range was found to be more evident in dry season.The variation trend of permissible pollution bearing capacity and near-bank discharge was similar for different conditions.Simple coefficients between the variation of near-bank discharge and permissible pollution bearing capacity were calculated.However,a significant correlation was found with permissible pollution bearing capacity of NH 3-N only.

关 键 词：金沙江 水电梯级 动态纳污能力 水文过程 

分 类 号：TV213[水利工程—水文学及水资源] X524[环境科学与工程—环境工程]