基于双权重的控制断面水质达标方案研究——以南水北调京杭运河邳州段张楼断面为例

Research on standard scheme of water quality at control section of river based on double weight theory: Take Zhanglou section in Pizhou city of Beijing-Hangzhou canal of south-to-north water diversion as example

南水北调京杭运河邳州段张楼断面是列入国家考核的江苏省6个断面之一,全面分析张楼断面水质污染负荷及邳州市内外污染权重对改善张楼断面水质意义重大。本文采用污染负荷比方法计算了COD、氨氮、TP、石油类4项因子对张楼断面的水质污染权重;在一维水质模型的基础上,根据设计水文条件及边界水质,计算各项因子在不同流向情况下邳州市内、外污染源对张楼断面水质影响的权重。结果表明:①4项因子对张楼断面的污染贡献率均在19%~32%之间;②对于COD、氨氮、TP邳州市内部污染源占70%,对于石油类邳州市内部污染源占40%;③在污染工程实施后张楼断面水质浓度值能达到地表水Ⅲ类水标准。本文计算方法及结果为实施张楼断面流域层面的污染控制提供依据。

Zhanglou section in Pizhou city of Beijing-Hangzhou canal of south-to-north water diversion is one of six sections in Jiangsu province which is included in the national examination .Comprehensive anal-ysis of water pollution load , internal and external pollution rights has important significance for improving water quality of Zhanglou section .This article adopted the load ratio of pollution to computer the weights of water quality pollution at Zhanglou section by COD , NH3-N,TP and oil.On one-dimensional river model, the paper simultaneously calculated the weights of impact of pollution source within and out of the control region on water quality in different flow directions of every factor according to designed hydrology conditions and the boundary conditions of river .The results indicate that:①the contribution rate of pol-lution of four pollutants to Zhanglou section is 19%~32%;②COD, NH3-N and TP of the internal pol-lution sources accounted for 70%of the total pollutants ,while oil type of that accounted for 40%;③after the project of control pollution is put into effect , the water quality can meet the water quality standard of ClassⅢof surface water .The calculation method and results can provide the basis for the implementation of pollution control of basin level in Zhanglou section .