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《Scientia Geographica Sinica》 2007-05
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Analysis of the Variation of Topographic Index Spatial Scale Based on the Modified Multiple Flow Direction Algorithm

YONG Bin1,ZHANG Wan-Chang2,LIU Chuan-Sheng1(1.International Institute for Earth System Science(ESSI),Nanjing University,Nanjin,Jiangsu 210093;2.Key Laboratory of Regional Climate-Environment for Temperate East Asia,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029)  
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°×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.
【Fund】: 国家重点基础研究发展规划项目(2006CB400502 2001CB309404);; 中国科学院“百人计划”择优支持项目(8-057493);; 中国科学院大气物理研究所东亚区域气候-环境重点实验室开放基金项目资助
【CateGory Index】: P333
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