Spatial characters of road network in Beijing and its relations with runoff risk based on GIS

Urbanization increases the urban area of storm flood disaster risk, the quantitative study of urban rainfall runoff characteristics, can provide a scientific basis for the scientific planning and management of the city. Rings with the area of Beijing as the research object, by using GIS technology to extract the rings in land cover information, combined with the functions of the different regions use partition. On the basis, combining with SCS-CN hydrological models in the study area have been analyzed for different rainfall return period of rainfall runoff distribution characteristics, and quantitative identification of the risk area of flow produce rings in Beijing area. Rings in runoff yield risk pattern shows a center of high and low around the circular distribution, high flow risk zones mostly distributed in the center of the city's commercial and residential areas, low flow risk zones are mainly large park and natural green space, distributed between the fourth and the rings.