With the assistance of the monitored data of 2007, the impact of the second tributary Yinma River water quality (worse than level Ⅴ water standard) on Songhua River was analyzed. A coupled hydrodynamics and water quality model of Songhua river net was developed. Based on this model, the impact of Yinma River on water quality of main stream of Songhua River was predicted. The results indicated that if the water quality of tributary met level Ⅲ water standard, the water quality of main stream of Songhua River was improved largely from June through August. Ammonia Nitrogen Index was improved more significantly than that of CODCr. The impact was small in low flow months.%利用2007年的监测数据分析第二松花江支流饮马河(劣V类水质)对干流水质的影响程度,通过建立的松花江流域一维河网水动力水质耦合模型,模拟分析了饮马河水质改善(假设达到Ⅲ类水)后对第二松花江干流水质变化的影响.结果表明:6-8月支流水质改善后对干流水质影响较大;NH3-N指标比CODCr指标改善明显;枯水月支流水质对干流水质的影响较小.
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