Analysis And Evaluation On Water Quality For Main Lakes Of Caidian District,wuhan City

Hubei province of thousands of lakes is world-famous.As the provincial capital,wuhan is also known as the city of hundreds of lakes.There are as many as 166 lakes in the city.The research area of this paper is caidian district in the west of wuhan,with 28 lakes of different sizes.With the development of agriculture,aquaculture and economy in caidian district,water resources in the lake have been polluted to varying degrees.Therefore,more and more attention has been paid to the prevention and control of water pollution.It is an important means to adopt reasonable water quality assessment methods and establish stable and reliable water quality assessment system for water quality monitoring and water pollution control.Therefore,it is necessary to study water quality assessment methods for large lakes.Based on the actual situation,Houguan lake,one of the key lakes in caidian district,is selected as the research object in this paper.The water area of houguan lake is the largest in caidian district,which is composed of four sub-lakes,namely Gao lake,Nan lake,Bailian lake and Houguan lake.This paper mainly analyzes the water quality of these four sub-lakes from 2013 to 2017,and evaluates their water quality in various aspects.The content of this paper follows:(1)According to water quality monitoring datas of lakes,this paper selected single factor evaluation and comprehensive water quality evaluation to evaluate water quality.The results show that the water quality of Gao lake is deteriorating year by year,the water quality of Bailian lake and nan lake remain at a relatively stable level,the water quality of Houguan lake is better.(2)In this paper,single factor index method and comprehensive pollution index method are compared from many aspects,and it is found that the above methods have different types of shortcomings.In order to make the evaluation results more accurate,this paper selected a more scientific method to improve,to make up for the shortcomings of the existing water quality evaluation methods.(3)The paper screens existing methods of water quality evaluation,and the fuzzy comprehensive evaluation method was selected for improvement.It avoids subjectivity when determining the weight coefficient of each water quality index,and the weighted average of the comprehensive evaluation results is calculated,finally,more comprehensive and objective evaluation results are obtained.