Study on the coupling relationship between water environment and social economy in Ganjiang River basin

Investigating the coupling relationship between water environment and social economy is the hot issue in the sustainability study of river basin. Ganjiang River is the largest tributary of Poyang Lake watershed in China. Based on the social economic and water environment status quo in Ganjiang River basin from 1999 to 2016, this research builds the coupling coordinate model, and uses this model to analyze the coupling degree and coordinate degree between the social economic development and the water environmental quality by constructing evaluate formulate, comprehensive utilization of principal component analysis method and coupling model. The results indicate that for the time node of 2006, the period from 1999 to 2006 is the social economic lag phase and the period from 2007 to 2016 is the water environment lag phase; in the Ganjiang River basin, the coupling degree and the coordinate degree between social economy and water environment are not ideal from 1999 to 2016. If this basin continues the existing development speed, the pressure of water environment brought by the social and economic development will become very huge in the next years.