水库溶解氧的立面二维数值模拟  

Vertical 2D numerical simulation of dissolved oxygen in reservoir

作　　者：曾玉红[1] 槐文信[1] 陈刚 刘建[3] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]云南省水利水电勘测设计研究院,云南昆明650051 [3]深圳大学土木工程学院,广东深圳518061

出　　处：《武汉大学学报（工学版）》2013年第1期10-14,共5页Engineering Journal of Wuhan University

基　　金：教育部新世纪人才支持计划项目(编号:NCET-11-0393);武汉市青年晨光计划项目(编号:201050231059)

摘　　要：采用宽度平均的立面二维数学模型对水库水质进行数值模拟,通过对水位、水温的计算值与实测值的对比,验证了模型模拟水库水质的有效性.在此基础上,对库区的溶解氧浓度分布进行计算,结果表明,溶解氧的计算值与实测值整体吻合较好,基本能够反映水库中的溶解氧分布特性.对该水库水体中的饱和溶解氧率的计算分析表明,水库水体2007年全年的饱和溶解氧率多在90%以上,水体总体质量较好.在3-5月气温适宜的条件下,由于浮游植物生长旺盛,过饱和情况较为明显.而在夏季(6-9月),由于气温高,水体复氧能力较弱,同时同时期上游来水丰沛,随地表径流带来的面源污染也增加了水体的耗氧量,致使这一时期的溶解氧浓度较低,因此水库溶解氧受上游来流及气温的影响较为显著.A width-averaged vertical 2D numerical model was adopted to simulate the water quality in a reservoir.Firstly,the water level and water temperature were predicted,and the agreement between the calculated results and the measured data proved that this model is effective in predicting the water quality in reservoir.Then the dissolved oxygen in the reservoir has been predicted,and saturated dissolved oxygen rates were calculated.Further analysis shows that most of the saturated dissolved oxygen rates in 2007 are higher than 90% which means that the water quality of this reservoir is satisfied.Oversaturation phenomenon appeared from March to May since the temperature was comfortable and the growth of aquatic vegetation was exuberant.During flooding season（June to September）,the surface runoff into the reservoir carried a large number of non-point source pollution,which increased the dissolved oxygen consumption;at the same time,the high temperature during this season restained the reoxygenation process of the water body.The conclusion is that the inflow and air temperature are two main factors affecting the concentration of dissolved oxygen.

关 键 词：水库 立面二维数学模型 水温 溶解氧 饱和溶解氧 

分 类 号：X524[环境科学与工程—环境工程]