基于改进型多流向算法的地形指数空间尺度变化分析

doi:10.13249/j.cnki.sgs.2007.05.683

地理科学 ›› 2007, Vol. 27 ›› Issue (5): 683-688.doi: 10.13249/j.cnki.sgs.2007.05.683

基于改进型多流向算法的地形指数空间尺度变化分析

雍斌¹, 张万昌², 刘传胜¹

1. 南京大学国际地球系统科学研究所江苏南京 210093;
2. 中国科学院大气物理所东亚区域气候-环境重点实验室全球变化东亚区域研究中心北京 100029

收稿日期:2006-06-16 修回日期:2006-10-22 出版日期:2007-09-20 发布日期:2007-09-20
基金资助:
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

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

Received:2006-06-16 Revised:2006-10-22 Online:2007-09-20 Published:2007-09-20

摘要/Abstract

摘要： 地形指数ln(α/tanβ)是流域径流源面积和地下水水位空间分布特征的近似表征,是地形特征参数化的重要指标。基于改进后的地形指数多流向计算方法,在0.5×0.5°的区域气候模式尺度框架下,探讨了地形离散和平滑效应分别对地形指数尺度变化的影响程度;研究了地形指数在100和1000m栅格尺度上的相关性,给出两者在空间尺度上的转换关系;分析区域尺度和全球尺度下地形指数尺度转换的差异及原因。研究结果可以增强地形信息在大尺度水文模型及陆面水文过程中的适用能力。

Abstract: 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.

中图分类号:

P333.9

雍斌, 张万昌, 刘传胜. 基于改进型多流向算法的地形指数空间尺度变化分析[J]. 地理科学, 2007, 27(5): 683-688.

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.

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基于改进型多流向算法的地形指数空间尺度变化分析

Analysis of the Variation of Topographic Index Spatial Scale Based on the Modified Multiple Flow Direction Algorithm

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