Topographic index is an important parameter of topographic characteristics,which is normally used to approximately characterize the spatial distribution of source area of surface runoff and ground water tables in a catchment.Under the 0.5白0.5? regional climate model scoop,scaling effect of topographic index,which is calculated by the modified multiple flow direction algorithm,resulted from the terrain discretization and smoothing effects was explored,the statistic correlations of topographic indexes in 100 m and 1000 m grid size scales were quantitatively analyzed respectively and the transferring relations between these two resolutions in regional scale modeling applications were given.Consequently,differences in mean topographic indexes computed from regional climate model grid-size scale and GCMs were discussed and compared.This result has a practical implication for large scale hydrological model.Especially,this study opens a way to accurate terrain analyses to be used in the land-surface process modeling for regional scale application.
YONG Bin, ZHANG Wan-Chang, LIU Chuan-Sheng
. Analysis of the Variation of Topographic Index Spatial Scale Based on the Modified Multiple Flow Direction Algorithm[J]. SCIENTIA GEOGRAPHICA SINICA, 2007
, 27(5)
: 683
-688
.
DOI: 10.13249/j.cnki.sgs.2007.05.683
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