关键词: 降雨径流;下垫面;功能区;长江经济带;

Abstract: To systematically understand the urban non-point source pollution in the Changjiang River Economic Belt, this paper divided the urban rainfall runoff survey data of each province(municipality)in the Changjiang River Economic Belt into the underlying surface and functional area, and the rainfall runoff pollutant indicators of different underlying surfaces and urban functional areas were compared and analyzed.The correlation between the averageconcentration of pollutants inrainfall runoff and the level of economic growth was analyzed using a linear mixed model.The results showed that the rainfall runoff pollution from the underlying surface in the province of Changjiang River Economic Beltis mainly caused by the pavement, and is significantly higher than that from roofs and green spaces.Transportation areas have the highest rainfall runoff concentration of pollutants, followed by commercial and industrial areas, while residential areas have the lowest concentration.The rainfall runoff concentration of pollutants is higher in the Changjiang River's middle and lower reaches.And there is a positive correlation between the level of economic growth and the concentration of rainfall runoff pollutants.This study can guide the planning and design of comprehensive treatment of urban rainfall runoff pollution in the Changjiang River Economic Belt.

Key words: rainfall runoff; underlying surface; functional area; Changjiang River Economic Belt;