Analysis And Evaluation Of Water Quality Restoration Performance In The Nanjing Section Of The Yangtze River

With the continuous development of urban construction and industry,water pollution problems have been urgently managed,and the top priority is to conduct in-depth analysis of water bodies.Only by grasping the key factors of water pollution can targeted treatment of the water pollution in different locations be carried out.As the pollution status of Nanjing section of Yangtze River at various stages is analyzed in this dissertation,and the water quality restoration after various stages of water environment treatment is studied in depth.The main work of the paper is as follows.(1)This thesis design the Nemerow Pollution Index Method Based on Principal Component Analysis.Based on the method,the nine sections of the Yangtze River were analyzed and evaluated from 2010 to 2020.The following analysis results were obtained: 1.The downstream water quality is better than that in the upstream and midstream.2.The water quality of the Yingjiang Road Bridge and the Stone River Gate is significantly improved.3.The water quality of Yue Zi River Gate presented a worsening trend.4.Sanjiang River,Jiu Xiang estuary,Hua Zi River Gate,the tail of Ba Gua Islet,and Nanjing Yangtze River Bridge,etc.can maintain current water quality by conservative strategies.(2)Based on the probability transfer matrix with time and space attributes,this thesis model the nine sections of the Changjiang Nanjing section from 2010 to 2020.The results show1.The water quality of Yue Zihe River Gate and Jiu Xiang River was very well,but there has been a declining trend in recent years.2.Water pollution control of each section in the Nanjing section of the Yangtze River is independent.There is no interaction between upstream and downstream in water pollution control.3.The Stone River Gate was the most serious pollution point in the Yangtze River originally.Since 2020,the water quality has gradually improved.The Yangtze River Water Protection Policy has effectively promoted the effectiveness of the water pollution control of the Yangtze River.4.With the implementation of the policy,there are more and more regions achieving better water quality(middle pollution).In addition,the Yue Zi River Gate will need to strengthen sewage treatment.The spatially comparative analysis of the Nanjing segment of the Yangtze River also shows the need to adjust the downstream treatment plan according to the upstream treatment and to achieve synergistic upstream and downstream treatment.Based on the conclusions of both aspects of this paper,it can be seen that the water quality management of Nanjing section of Yangtze River has improved significantly in the context of Yangtze River protection.With the implementation of the policy,more and more water quality in Nanjing section of Yangtze River has achieved good water quality,but there is room for further improvement of the treatment measures.