| The changsha section of xiangjiang river is affected by impound of the water conservancy project,The dynamics of the river changed,it was affected the quality of the water environment.This research started at July 2015,ended at July 2016,The whole study lasted for twelve months.Tracking monitoring and analysis of the project upstream of the dam Xiangjiang River Changsha(six sections),Main monitoring of heavy metals soluble content include cadmium,lead,mercury,arsenic,it can represent the degree of eutrophication of total nitrogen,total phosphorus,ammonia content.Combined with the national surface water environmental quality standards analysis,evaluation and monitoring of water quality.The analysis of the measured data shows that the majority of the water quality of the Changsha section of the Xiangjiang River during the testing period is above the national Class III standard.The main pollutants in the watershed were the total nitrogen,total phosphorus and soluble mercury.The total nitrogen exceeded the standard rate was 97.06%,the total phosphorus exceeded the standard rate was 61.09%,and the excess rate of soluble lead was 70.59%.The higher content of eutrophication related indicators is mainly in the heishiDu.In order to prevent the sudden occurrence of heavy metal pollution in Xiangjiang waters,the Curve Fitting and MBC model fitting tools under MATLAB toolbox were used to establish the fitting model.The results show that the fitting effect of the eutrophic module is better,the whole is above 0.800,the fitting value of the heavy metal module is relatively low,the fitting value is above 0.7400,and the heavy metal development in the water can be predicted more accurately,especially the soluble The fitting coefficient of cadmium is 0.9086.Finally,according to the twelve months of the measured data analysis and field trips,put forward the eight Xiangjiang River water quality timely and effective prevention and treatment recommendati... |
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