雁栖河流域水质的关键影响因素研究

Study on key factors affecting water quality in Yanqi Watershed

针对雁栖河流域水质变差、富营养化风险增加等问题,通过对流域水质的连续监测,确定了影响流域水质的控制指标是TN和TP。在水质监测的基础上分析了流域水质的时空分布规律,并对流域污染负荷进行了调查和估算,在此基础上采用MIKE21建立平面二维水动力水质模型,对雁栖湖水质变化规律进行了模拟。研究表明,影响流域水质的关键因素是渔场养殖污水直排,受降雨径流影响,水质存在明显的季节性特征,而内源释放是影响湖区水质的重要因素之一。

In view of the problems of deteriorating water quality and increasing eutrophication risk in Yan⁃qi Lake Basin,TN and TP are determined as the control indexes through continuous monitoring of water quality in Yanqi Lake Basin.On the basis of water quality monitoring,the temporal and spatial distribu⁃tion of water quality in Yanqi lake is analyzed,and the pollution load of the basin is investigated and esti⁃mated.Based on this,the planar two-dimensional hydrodynamic water quality model is established by us⁃ing MIKE21 to simulate the water quality change law of Yanqi Lake.The results show that the key factor affecting the water quality of the basin is the direct discharge of aquaculture wastewater from fishing grounds.Affected by rainfall and runoff,the water quality has obvious seasonal characteristics,and the en⁃dogenous release is one of the important factors affecting the water quality in the lake area.