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中文摘要：
针对资料缺乏地区中小河流,提出了采用降雨径流相关法进行产流计算,采用Nash汇流模型进行汇流计算的山洪预警方法。利用ArcGIS软件由DEM提取流域的地貌地形信息,建立地形地貌参数与Nash汇流模型参数之间的数学关系,并推求出Nash汇流模型的n和k两个参数值,确定流域的汇流单位线。以大别山区大沙河流域为例,对10次洪水过程进行了模拟。结果表明：该方法不仅避开了大量的降雨径流资料的分析和处理,而且对径流深和洪峰流量模拟合格率均达到了80%,取得了较好的模拟效果,为解决缺资料地区的山洪预警问题提供了一种途径。
英文摘要：
For flash flood warning in ungauged basins, this paper proposes an approach that uses an antecedent precipitation index method and a Nash model for runoff forecasting. To estimate the parameters n and k of this model, we established a mathematical relationship between these parameters and the topographic attributes derived from DEM using the software ArcGIS. This approach was tested by simulations of ten flood events in a case study of the Dasha River basin. The results show that the qualified simulations of both runoff volume and flood peak discharge account for 80%. The approach does not need mass rainfall-runoff data and it is very useful for flash flood warning in ungauged basins.
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