银江水电站建设对库区水环境的影响预测

Predicting the Influence of Yinjiang Hydropower Station Construction on Water Environment in the Reservoir Area

受观音岩水电站非恒定流下泄影响,金沙江攀枝花市区河段水位波动剧烈,同时,该河段内取水口和排污口交错分布,银江水电站建设将使银江水电站库区河段水文情势、水环境发生变化。本文采用数值模拟的方法预测分析银江水电站建设对研究河段内主要取水口水质的影响。预测结果表明:银江水电站的建设将使库区水体体积增加,库区河段平均水深、水面宽明显增加,库区水体对污染物的稀释能力增强,各取水口断面COD浓度较建库前降低了0~0.27 mg/L,NH3-N浓度降低了0~0.028 mg/L,库区总体水质较建库前有所改善。

Affected by the unsteady flow of Guanyinyan hydropower station, the water level of Panzhihua urban section of Jinsha River fluctuates violently. At the same time, the water intake and the sewage outlet in the section are interlaced distribution. The construction of Yinjiang Hydropower Station (YHS) will change the hydrological regime and water environment of the section in the reservoir area. This paper adopts the numerical simulation method to predict and analyze the influence of YHS construction on the water environment of the main water intake in the study river section. The prediction results show that the construction of YHS will increase the water volume, the average water depth and water surface width significantly, enhance the dilution ability, reduce the COD concentration of each water intake section by 0 - 0.27 mg/L, the NH3-N concentration by 0 - 0.028 mg/L, and improve the overall water quality.