【摘要】 介绍了在基于地表坡面径流模拟分析的基础上,充分利用山洪灾害防治规划数据集的数字高程模型(DEM)、水系数据,和气象、地貌、岩性等环境因子数据进行小流域提取的方法。利用了高精度DEM的生成方法,在地理单元分割和环境因子分类的基础上将规划区域分区,对不同区域使用不同的水道给养面积阈值进行水系和小流域单元提取。并针对小流域单元特点对提取的单元进行分割和归并。实验表明此方法是实用可行和方便的。更多还原

【Abstract】 The scheme presented was based on accumulated flow analysis,and using available feature classes of datasets,which include DEMs and streams,taking into account environmental factors(climate,relief,lithology etc.).Fundamental catchments units were extracted first,and each environment factor was subdivided into categories that discriminated variation in characteristics.Then catchments were delineated in different regions by using different critical contributing area thresholds.The methodology has been tested and proved to be practical and convenient.更多还原