流域地貌瞬时单位线法剖析

ANALYSIS ON GEOMORPHOLOGIC INSTANTANEOUS UNIT

本文对流域地貌瞬时单位线法进行了剖析,得到现行的地貌单位线的实质与改进的等流时线法很相似。从计算结果知,地貌单位线法、Nash线法、滞后演算法的精度相当。地貌单位线法没有因采用地貌特征参数而提高精度,即说明地貌特征参数的作用没有充分显示出来。

GIU (Geomorphologic Instantaneous Unit) is analyzed in the paper. It is showed that GIU method is similar to lag and route methed in nature.the computations for 3 selected basins indicate that the result of GIU is comparable with that of Nash unit method and that of lag and route method.Geomorphologic parameters in present GIU method do not play a very important role as expected. There is a small difference between Nash duration unit hydrograph and geomorphologic duration unit hydrograph .The determination of velocity of runoff concentration should be researched further for GIU.