Studying the coupling coordination degree between socio-economic and eco-environment of Jing-Jin-Ji urban agglomeration during 2001-2015

With the fast urbanization process of China, many problems also have arisen. Under such background, pursuing the coordinated development of the socio-economic subsystem and eco-environment subsystem has become a hot spot. However, existing researches seldom investigated the regional coupling coordination degree at the gridded level. In this study, combined with the coupling coordination degree model, remote sensing datasets, and other socio-economic datasets at the raster format, we explored the coupling coordination degree of JJJ from 2001 to 2015 at the gridded level. The result of our study showed that (1) The eco-environment of JJJ had improved during 2001∼2015, among it, the eco-environment with high RSEI value mainly located in the mountainous area of JJJ, including the Yanshan mountain, and Taihangshan mountain. In contrast, the eco-environment with relatively low RSEI value was mostly located in the central Hebei plain and urban zone. (2) The spatial coupling coordination degree of JJJ showed a decreased trend, with the decrease of high, relatively high, and medium grades area, and the increase of low, and relatively low grades area. Generally, these high coupling coordination degree regions mainly located in the city's central zone, while these mountainous regions and central Hebei plain mainly displayed a low coupling coordination degree due to the socio-economic lag. These findings may provide more useful information for the relevant policy-makers.