传统单位线和地貌瞬时单位线在腰古流域的对比研究

Comparative Research on Traditional UH and R-V GIUH in Yaogu Basin

单位线是流域汇流计算中最基本和最重要的概念之一。传统单位线缺乏物理机制且对水文资料的依赖性强,而地貌单位线不需要过多的水文资料,主要依靠DEM提取的地形地貌参数获得,适用于无资料地区。为此,利用传统单位线以及地貌瞬时单位线(R-V GIUH)在腰古流域进行汇流计算,结果表明两种方法均适用于腰古流域。通过分析误差,揭示两种方法的优缺点,可为流域汇流方法的选择提供参考。

Unit Hydrograph（ UH） is one of the most fundamental concepts in watershed runoff concentration calculation.Traditional UH lacks physical mechanism and is strongly dependent on hydrological data. On the contrary, the geomorphologic unit hydrograph doesn＇t need too many hydrological data, instead, it mainly relies on topographical parameters extracted from DEM and is applicable in ungauged basins. Traditional UH and R-V GIUH are used to calculate runoff concentration in Yaogu Basin respectively. The result shows that both two methods are applicable in Yaogu Basin. By analyzing errors, the advantages and disadvantages of two methods are revealed and this can offer some reference in selecting watershed runoff concentration calculation method.