Abstract
Identification of areas susceptible to mountain torrent disasters is the basis of decision making for river basin flood control and flood disaster loss analysis, and analysis for those areas in small basin lacking data is key and difficult points of our study. Gulu small basin is chosen as the research object of the present work. According to the combination of rational formula and GIS technology, we propose a method for fast identification of areas susceptible to mountain torrents in small basin short of geological data. Based on the Digital Elevation Model (DEM) extracted from the characteristics of small basin in mountain torrent disasters prevention areas utilizing hydrological analysis tools, rational formula is used to calculate peak discharge and runoff volume at each outlet. Manning formula is adopted to compute each outlet water depth, then GIS spatial interpolation technology is used to calculate flood submerged areas. Through exploring technology and method in identification of areas susceptible to mountain torrents in small basin short of geological data, we have made breakthrough in integration research theory, and created a new way for mountain torrents disaster prediction.
