Study On The Coupling Coordination Evaluation Of Economic Development And Water Environment Risk Of Urban Agglomeration In The Middle Reaches Of The Yangtze River

With the acceleration of the industrialization process,problems such as the abuse of water resources,serious water pollution,and increased water environment risks have become more and more prominent,resulting in the inability to coordinate between the economy and the water environment.In view of this,this paper constructs a comprehensive evaluation index system for economic development and water environment risk,selects the relevant indicators of economic and water environment risk in the urban agglomeration in the middle reaches of the Yangtze River from 2005 to 2019,and conducts economic development and water environment risk in the study area based on the entropy weight method and comprehensive evaluation model.Level evaluation,use the coupling coordination degree model to measure the coupling coordination degree of economic development and water environment risk in the study area and analyze the characteristics of temporal and spatial changes,introduce the obstacle degree model to analyze the main influencing factors of the coupling and coordinated development of economic development and water environment risk,and propose future economic development and water environment risk.The countermeasures and suggestions for water environment construction,the conclusions mainly include:(1)By summarizing the existing research results,analyzing the development status of urban agglomerations in the middle reaches of the Yangtze River,and following the principles of scientificity,objectivity,comprehensiveness,and representativeness,a comprehensive evaluation index system for economic development and water environment risks of urban agglomerations in the middle reaches of the Yangtze River is constructed.The development subsystem mainly selects indicators from four aspects:economic scale,economic structure,economic quality,and economic potential.The water environment risk subsystem selects indicators from three perspectives:risk source hazard,control mechanism effectiveness,and risk receptor vulnerability.(2)From 2005 to 2019,the level of economic development showed a clear upward trend,and the development trend was good.The overall spatial distribution has evolved from a low level to a high level,with a significant decrease in low-level cities and a significant increase in high-level cities,and cities with high-level economic development are mainly provincial capitals.The risk of water environment showed a steady decline,and the decline was obvious.The number of high-risk cities has decreased significantly,and the number of low-risk cities has increased significantly.The spatial distribution has evolved from a medium-high risk level to a low-low risk level,and is in a critical stage of transition from a high-risk level to a medium-low risk level.(3)The degree of coupling and coordination between economic development and water environmental risks in the urban agglomeration in the middle reaches of the Yangtze River is on the rise.The type of coupling degree is dominated by medium and high coupling,and the number of cities with moderate coupling decreases and the number of cities with high coupling increases.The type of coordination degree increased from mild dissonance to reluctance to coordinate,and the overall level evolved from low level to high level.By 2019,the coordination degree of most cities was between 0.5 and 0.9,and there were fewer cities on the verge of deregulation.Among them,Wuhan has the highest coordination degree of 0.813,which is at a good level of coordination.The coordination degrees of Changsha and Nanchang are 0.776 and 0.651,respectively,which are at the primary coordination level and above.The spatial distribution of coordination degree presents a distribution pattern of "multi-center" small agglomeration centered on the provincial capital city and radiating and spreading to surrounding low-value areas.The gap between high-value and low-value areas of coordination in urban agglomerations is gradually narrowing,and the characteristics of coordinated development within urban agglomerations are obvious.(4)Using the obstacle degree model to analyze the influencing factors of the coupling coordination degree,it can be seen that economic development restricts the coordination of economic development and water environment risks of urban agglomerations in the middle reaches of the Yangtze River.Based on the result analysis,the countermeasures and suggestions for improving the coordination degree between economic development and water environment risk of urban agglomeration in the middle reaches of the Yangtze River are put forward.