基于多要素评价指标的鄱阳湖水体富营养化研究

Monitoring of Water Quality in Poyang Lake Based on Multi-factors Evaluation Indexes

基于Landsat卫星OLI影像对2018年5月鄱阳湖的叶绿素a浓度、悬浮物浓度、有色可溶性有机物浓度进行了湖区水体水质参数反演,根据水质参数反演得到鄱阳湖各评价指标要素浓度归一化分布图。结果表明:叶绿素a、悬浮物以及有色可溶性有机物主要集中在水流速度较为缓慢的东部湖区以及南部湖区,干流水体动力较大,含量较低。悬浮物浓度在其他湖区也存在浓度较高显现,与采砂活动或湖区浅滩反射有关,整个湖区中鄱阳湖东部以及南部水质较差。综合叶绿素a浓度、悬浮物浓度、有色可溶性有机物浓度空间变化规律以及湖区周围污染源进行水质污染空间分布的探讨,同时也为鄱阳湖水质监测提供丰富案例,为水体污染和防治提供依据。

In this study,the chlorophyll a concentration,and suspended matter concentration and cdom concentration of poyang lake in may 2018 were retrieved based on landsat satellite oli image.According to the inversion of water quality parameters,the normalized distribution map of the concentration of each evaluation index in Poyang Lake is obtained.The results show that chlorophyll a,suspended matter and cdom were mainly in the eastern lake area and the southern lake area,where the water power of the main stream was large and the content was low.The concentration of suspended matters is also high in other lake areas,which is related to sand mining activity or shallow beach reflection in the lake area.The water quality in the ministry and in the south is poor.With consideration of chlorophyll a concentration,and the concentration of suspended matter,and the spatial variation of cdom concentration,a discussed on the spatial distribution of water pollution sources around the lake area was conducted.It also provides some cases for water quality monitoring of Poyang Lake,and provides supports for the water pollution prevention.