Study On Water Environment Quality Assessment And Pollution Control Countermeasures In Xiangxi River Basin

Xiangxi River is located in the western part of Hubei Province.As the largest tributary of the Hubei section of the Three Gorges reservoir area,its geographical location is very important.The health of its water environment not only affects the daily life production of the residents on both sides of the Xiangxi River Basin,but will even directly affect the Three Gorges reservoir area.The quality of the water environment is safe.In recent years,along with the Three Gorges immigrants,the resident population of the Xiangxi River Basin has increased,and the pollution of life has increased.Coupled with the traditional agricultural industrial pollution,the problem of water environment pollution in the Xiangxi River Basin has become more serious.How to maintain the Xiangxi River Basin The health of the aquatic environment and the solution to the problem of watershed pollution are of great significance to the sustainable and healthy development of the ecosystem in the Three Gorges reservoir area.Through on-the-spot investigation and collection of literature,the general situation of the Xiangxi River Basin and the current situation of water pollution investigation in the basin were introduced.In order to understand the main pollution types and water quality of the basin,we selected five monitoring points and four evaluations.Indicators(ammonia nitrogen,fluoride,total phosphorus,chemical oxygen demand),using the monitoring data of 12 months in 2016,the water environment quality of Xiangxi River Basin based on entropy weight method and over-multiple multiple method was established.Evaluate the model and compare and analyze the evaluation results.The evaluation results show that the fuzzy evaluation model based on the super-standard multiple method can more objectively reflect the actual water quality of the Xiangxi River.According to the evaluation results of the empowerment method,the overall water quality of the first,second and third monitoring points reached the whole year.In the water-like body,the overall water quality of the monitoring points of No.4 and No.5 reached the V-type water body,which did not meet the standard of the Class III water body of the Xiangxi River function.Among them,the pollution of total phosphorus and fluoride was more serious.Based on this evaluation,a GM(1,1)prediction model for the water environment quality of Xiangxi River Basin based on grey theory was established,and the water quality of the basin from January to March 2017 was predicted.The prediction results show that the water quality of the five monitoring points is deteriorating,and the increase of total phosphorus and fluoride concentration of the main pollutants is more obvious.Based on the current situation of water pollution investigation and water quality assessment and prediction results of Xiangxi River,the pollution control measures are proposed from the aspects of comprehensive management and pollution control for the pollution problems in the water environment of Xiangxi River Basin.