Current Situation And Trend Of Water Quality In The Main Lakes Of Caidian Distri,Wuhan City

Hubei is a province with many inner lakes.The provincial capital city of wuhan is known as the "city of hundreds of lakes".Caidian district is a district with the largest number of lakes in wuhan.There are twenty-seven large lakes in Caidian district,those lakes have an area of 87.15 square kilometers and water storage over 100 million cubic meters.With the continuous development of economic society,industrialization and urbanization,the lake area in Caidian district gradually decreased,the water quality of the lakes are polluted,the ecological environment of the lakes decline and the system function is restricted.Therefore,it is in urgent need of water pollution control.This paper adopts the single factor index method and synthesized index method to evaluate Present situation of water quality in 2007 and 2007-2017 annual average water quality of five main lakes in Caidian district;uses enduing with score method to valuate eutrophication status in 2007 of five main lakes in Caidian district;uses the method of Kendall test and Kendall slope estimation method to analyze the trend of water quality and the degree of water quality in 2007 to 2017.Through those analysis,we can reveal the current situation,eutrophication status and the trend of water quality of the lakes in Caidian district.It is significance realizing rational development,effective protection,comprehensive management and ecological environment restoration of water resources in.Caidian district.(1)The current situation of the main lakes in Caidian districtWater quality of Caidian west lake and guanlian lake is better,without exceeding standards,they all can meet the requirements of function.Compared with other lakes,the water quality of caidian chen lake exceeds the standard most,and the annual average water quality reaches standard V grade.xiaozha lake and guanlian lake all reach the middle grade pollution with the water quality standard IV grade.Water quality of the above five lakes from poor to good are caidian chen lake,houguan lake,xiaozha lake,caidian west lake,guanlian lake.(2)The nutrition situation of the main lakes in Caidian districtCaidian west lake,caidian chen lake,guanlian lake,xiaozha lake,houguan lake are all eutrophication with different degree.The eutrophication level of caidian chen lake are the highest.(3)Trent of water quality of the main lakes in Caidian districtThe water quality indexes with the fastest growth rate in caidian west lake,caidian chen lake,guanlian lake,xiaozha lake,houguan lake are Chla,TP,TP,TP,Chla,Respectively.Except the SD and TN index of caidian chen lake haven't significant trend,the SD index of other lakes decrease significantly,the TN,TP,Chla index of other lakes all increase significantly or increase highly significantly.