Effect of Urbanization on Precipitation in Yangtze River Delta

Taking Yangtze River delta(YRD) as the typical region, on basis of daily rainfall data from 1961 to 2006, this paper made contrastive analysis of annual and flood season precipitation between cities and suburbs in the study area with the method of statistical analysis，linear regression and R/S method. The results showed that 1) on the scale of region, for the area with relatively rapid development of urbanization, increasing trend of rainfall in urban areas was more than that of suburban areas, while for the areas with relatively slow development of urbanization, the gap was not obvious; 2) on the scale of city, for the city with relatively rapid development of urbanization, the increase amplitude of rainfall and urban-suburban gap were both obvious, for which with relatively slow development of urbanization, both were not obvious. This study can provide a reference for the analysis of urbanization.