污染负荷多情景变化下河流水质响应关系研究

以松花江哈尔滨段为研究对象，构建了EFDC水动力-水质模型，以主要污染物COD、NH₃-N为指标，结合情景分析方法对松花江哈尔滨段支流污染负荷多情景变化下对干流水质及下游出口断面水质进行量化评估.结果表明，大顶子山出口断面COD浓度值在满足Ⅲ类及以下水质要求时，阿什河口与呼兰河口的浓度在枯水期、桃花汛期、平水期和丰水期分别最高不能超过29.3、22.3、41.82和32.13mg/L以及47.75、36.27、65.4和41.47mg/L，大顶子山断面的NH₃-N浓度，枯水期保持在Ⅲ类，则要求阿什河口和呼兰河口NH₃-N浓度最高为8.73和2.92mg/L，桃花汛期保持在Ⅱ类时，则二者最高分别为6.3和2.23mg/L，枯水期大顶子山断面保持在I类时，阿什河口和呼兰河口则最高不能超过7.57和1.79mg/L.

Study on river water quality response relationship under multi scenario change of pollution load

With the Harbin reach of Songhua River as the studied object, the EFDC water quality dynamic model is developed, the main pollutant parameters COD, NH₃-N, combined with pollution load scenario analysis method for quantitative evaluation of the Harbin reach of the Songhua River and its tributary estuary sections under the change of water quality. The results show that the outlet COD concentration of Dadingzi Hill section meets the quality requirements of category Ⅲ and below, the Ashe estuary and Hulan estuary concentration in the dry season, flood peach, normal water period and high water period respectively, the maximum values are not more than 29.3, 22.3, 41.82, 32.13 mg/L, and 47.75, 36.27, 65.4, 41.47mg/L of Dadingzi Hill eatuary section in dry season in the category Ⅲ then, highest concentration of NH₃-N was 8.73 and 2.92mg/L at Ashe and Hulan estuary sections, which in flood peach period still remain in the category Ⅱ, with the two highest is 6.3 and 2.23mg/L respectively, in dry season, while the Dadingzi Hill estuary section is kept at category I, the Ashe and the Hulan estuaries can not exceed 7.57 and 1.79mg/L respectively.