Water Environment Quality Evolution Trend in Upper-reaches Area of Huangpu River

Fifteen years monitoring data in seven monitoring stations of mainstream Huangpu River and main upriver water system in upper-reaches area of Huangpu River were selected in order to reflect the water quality of upper-reaches area of Huangpu River,which are the main gist to analyse the water quality evolution in upper-reaches area.Huangpu River water source region lies in east plain tidal river network region,in which rivers are densely covered and water system is very complicated.Huangpu River water source connectes to the upstream of Jiangsu and Zhejiang province.Rivers in Yangtze River deltaic have serious organic contamination and its water generally become polluted.Further more,this problem became more and more serious,especially in the near ten years.Many small rivers dissolved oxygen almost near to zero and its water has seasonal or perennial pollution.Although effective control of the point and non-point contamination has been taken,Huangpu River water source can't effectively maintain its quality if the water quality of upstream of Jiangsu and Zhejiang province cannot be guaranteed.So the water quality of upstream of Jiangsu and Zhejiang province is an important factor to influence Huangpu River water source quality.