中文摘要：

针对小流域地区资料缺乏和灾害多发的特点，选取松岗河小流域为研究区域，应用水文模型和GIS技术相结合的方法，探索应用数字高程模型DEM进行山洪灾害空间影响范围的快速提取方法。首先，利用DEM提取小流域地貌水文特征；然后，运用SCS水文模型和小流域的下垫面信息，推演特定降雨量时山洪最大淹没水位；利用GIS技术，将离散的水位数据与数字高程数据叠加获取山洪最大淹没水深数据，并运用空间插值方法模拟山洪淹没信息的空间分布，绘制了小流域山洪灾害易发区图。结果表明该方法能够快速有效模拟特定降雨量条件下小流域山洪淹没信息的空间范围，为防洪决策和洪灾损失分析提供科学依据。

英文摘要：

According to the situation of lacking practical data and the high incidence of small watershed, This paper provides a method of circle susceptible area of debris flow by DEM in SongGang river. First, extract river grade and the water outlet information of small watershed. Second, deduce the highest submerged level of mountain torrents with a specific rainfall by using SCS model. The last, obtain mountain flood disaster--prone areas by using spatial interpolation methods. The results show that this method is fast and effective to simulate distribution of small catchment mountain torrents on different rainfall. It provides the scientific basis for decision flood control and the analysis of flood damage in the small catchment.