岗南-黄壁庄水库分区污染贡献率分析

本文采用输出系数法与浓度传递系数矩阵相结合的方法，开展了岗南-黄壁庄水库产汇区面源污染分区贡献率计算与分析。结果表明，对岗南水库入库CODCr和氨氮贡献率最大的是滹沱河干流入境水，为89.56%和76.31%；对黄壁庄水库入库CODCr和氨氮贡献率最大的是岗南水库下泄水和绵河、甘陶河入境水，二者合计贡献率占74.26%和66.58%，即上游山西来水对岗南-黄壁庄水库入库污染负荷的贡献最大。河北省境内各子流域对岗南水库贡献率均较小，大多在1%左右，郭苏河、险溢河相对较高也不超过4%；黄壁庄水库以冶河井陉-平山汇水区、南甸河和滹沱河干流岗南-黄壁庄水库区间最大，这三个子流域对入库CODCr和氨氮贡献率分别为7.12%和9.51%、4.69%和6.29%、3.53%和4.78%，应将这些区域作为岗南-黄壁庄水库产汇区面源污染优先控制区域。类型上以农田径流贡献最大，占比高达70%，其次为农村生活和畜禽养殖，分别占比23%和7%，应将农田径流作为优先控制污染源。研究成果可为具有复杂干支流特征的串联水库产汇区面源污染防治及消减提供参考。

Regional Contribution Rates of Nonpoint Source Pollution to Gangnan-Huangbizhuang Reservoirs

In this study, the export coefficient method and concentration transfer coefficient matrix were combined to calculate and analyze the regional contribution rate of non-point source pollution in Gangnan-Huangbizhuang Reservoir. The results showed that the largest contribution rate of CODCr and ammonia nitrogen to Gangnan Reservoir was the inflow water of Hutuo River, accounting for 89.56% and 76.31% respectively. The largest contribution rate of CODCr and ammonia nitrogen to Huangbizhuang Reservoir was the outflow of Gangnan Reservoir and the inflow of Gantao River and Mian River, the total absolute contribution rate of which accounted for 74.26% and 66.58%, that is, the upstream water from Shanxi Province contributed the most to the pollution load of the Gangnan-Huangbizhuang Reservoir. While the contribution rate of each sub-basin in Hebei Province to Gangnan Reservoir was relatively small, mostly about 1%, and the contribution rate of Guosu River and Xianyi River were relatively high but not more than 4%. The largest contribution rate of Huangbizhuang Reservoir was Jingxing-Pingshan section of Ye River, Nandian River and Gangnan-Huangbizhuang section of Hutuo River, contributions of these three sub-basins to CODCr and ammonia nitrogen were 7.12% and 9.51%, 4.69% and 6.29%, 3.53% and 4.78%, which were supposed to be taken as the priority control area of non-point source pollution of Gangnan-Huangbizhuang water source. In terms of types, farmland runoff contributed the most, up to 70%, followed by livestock and poultry breeding, accounting for 23% and 7%. Therefore, farmland runoff should be taken as the priority source of pollution control. The results provide the reference for the prevention and reduction of non-point source pollution in the catchment area of serial cascade reservoirs with complex trunk and tributary characteristics.