Spatial and Temporal Changes of Maximum 1h Precipitation Intensity in Beijing Region in Last 53 Years

In last 50 years,the urbanization,land use and population expansion have a significant effect on the spatial and temporal changes of short duration precipitation in Beijing region.The observed data of the maximum 1h precipitation from 27 representative precipitation stations during 1956~2008 were used to analyze the spatial and temporal variation of short during precipitation in Beijing region.The results show that the maximum 1h precipitation has an increasing trend in the north and west during the 53 years while there is no obvious change in the east and south.As for the spatial variation,the east and south are two storm centers,with the largest precipitation rainfall in the east and the second in the south.It is easy for the urban center to suffer from extreme rainstorms,and precipitation is smaller in the north and west.