引调水改善玄武湖水质的水量优化方法  

Water quantity optimization method for improving water quality of Xuanwu Lake by water diversion

作　　者：逄敏 宋为威 钱程 PANG Min;SONG Weiwei;QIAN Cheng(School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518001,China;College of Environment,Hohai University,Nanjing 210098,China)

机构地区：[1]南方科技大学环境科学与工程学院,广东深圳518001 [2]河海大学环境学院,江苏南京210098

出　　处：《水资源保护》2021年第4期133-139,共7页Water Resources Protection

基　　金：国家自然科学基金(52000100,51879070);国家水体污染控制与治理科技重大专项(2018ZX07208-005,2018ZX07208-007);江苏高校优势学科建设工程资助项目。

摘　　要：针对2012—2017年玄武湖增加生态补水量并不能让湖泊水质转好的问题,通过实测水量水质数据拟合、零维模型的推导和二维水环境数学模拟预测的方法研究玄武湖水质优化方法及应用。实测拟合发现湖区水质随着补水量的增加呈现先转好再变差的趋势。通过零维模型的公式推导及量化参数的方法,得出玄武湖污染物降解量与补水量呈负一次函数关系,玄武湖水质与补水量呈二次方关系,并得出丰水期优化补水量为20万t/d,枯水期优化补水量为15万t/d。运用水环境数学模型进行模拟预测,在枯水期近期削减现状入湖污水的40%水质最优时的补水量为12万t/d;在丰水期,近期削减现状入湖污水的40%时的水质最优补水量为18万t/d,远期削减现状入湖污水80%时的水质最优补水量为15万t/d。In response to the problem that the increase of ecological water supply in Xuanwu Lake from 2012 to 2017 cannot improve the water quality of the lake, the water quality optimization method and application of Xuanwu Lake were studied by fitting the measured water quantity and quality data, deriving the zero dimensional model and two-dimensional water environment mathematical simulation prediction. In the process of fitting of measured data, it was found that the water quality of the lake area first got better and then got worse with the increase of water supplement. Through the formula derivation of the zero-dimensional model and the method of quantifying the parameters, it was concluded that the degradation amount of pollutants in Xuanwu Lake had a negative linear function relationship with the water diversion. The lake-reservoir hybrid model was used to further deduce that the water quality of Xuanwu Lake showed a quadratic relationship with the water diversion amount, and it was concluded that the optimal water replenishment amount was 2.0×10^(5) t/d during the wet season and 1.5×10^(5) t/d during the dry season. The mathematical model of the water environment is used to simulate and predict, and the optimal replenishment amount is 1.2×10^(5) t/d when the current wastewater into the lake is reduced by 40% during the dry season. During the wet season, the optimal replenishment amount is 1.8×10^(5) t/d when reducing 40% of the current sewage into the lake in the near future. During the wet season, the optimal water diversion amount is 1.5×10^(5) t/d when the current sewage into the lake is reduced by 80% in the long-term.

关 键 词：引调水 水量 水质 水环境数学模型 玄武湖 

分 类 号：TV122[水利工程—水文学及水资源]