Hydrological Effects of Urbanization in the Qinhuai River Basin, China

摘要

The effects of urbanization on river network and hydrological process were investigated at Qinhuai River basin. RS and GIS technology were applied to extract land use information and analyze the land cover changes according to RS images and topographic maps. Regression analysis was carried out based on long-term observation data. Results showed that build-up land proportion increased rapidly from 8.34% to 16.83% from 1991 to 2006. River network structure was simplified. From 1961 to 2001, the rainfall increased with a widening gap between urban and suburban area. Imperviousness presented logarithm relevant to runoff, with correlation coefficient as high as 99%.