Calculation of Topography Index for the TOPMODEL

WU Bo; ZHANG Wan-chang

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Calculation of Topography Index for the TOPMODEL

- Calculation of Topography Index for the TOPMODEL
- Bulletin of Soiland Water Conservation Vol. 25, Issue 5, Pages: 49-52(2006)
- 作者机构：
  
  1. 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研究所东亚区域气候环境重点实验室,北京,100029
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2006
- 稿件说明：
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WU Bo, ZHANG Wan-chang. Calculation of Topography Index for the TOPMODEL[J]. Bulletin of Soiland Water Conservation, 2006, 25(5): 49-52.
DOI：

WU Bo, ZHANG Wan-chang. Calculation of Topography Index for the TOPMODEL[J]. Bulletin of Soiland Water Conservation, 2006, 25(5): 49-52. DOI：

摘要

地形指数是TOPMODEL(topography index，也称湿润指数，wetness index)中一个重要的输入参数，它把流域饱和缺水量，变动产流面积的概念紧密联系起来。根据定义介绍了它的计算方法，解决了坡度为零的栅格的处理以及河道造成的地形指数值偏大的问题。并以两河口流域(2818km

)分辨率为60m的数字高程模型栅格网为例生成地形指数，配合相应的气象数据和水文资料，在TOPMODEL中进行了径流日模拟，效率在70％左右。

Abstract

Topography index (wetness index) is a crucial kind of input data

which links the saturation deficit of a basin with the conception of variable contributing area.According to the definition of topography index

procedures of calculating the index were presented.Solutions to problems of processing grids with zero slope degree and expurgated deviations induced by the involvement of channels in computation were introduced.The index was derived from the DEM of the Lianghekou Basin with a solution of 60 m in this method

and then imported into TOP-MODEL with a suitable data set.The result of daily runoff simulation turns out to be acceptable with about 70% prediction precision.

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Related Author

HUANG Qing

ZHANG Wan-chang

LI Ben gang

TAO Shu

Related Institution

International Institute of Earth System Science,Nanjing University

START Regional Center for Temperate East Asia, Institute of Atmospheric Physics, CAS

School of Earth Science and Engineering, Nanjing University

Department of Urban and Environmental Sciences of Beijing University, Beijing 100871, PRC

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