地理科学进展 ›› 2005, Vol. 24 ›› Issue (6): 116-123.doi: 10.11820/dlkxjz.2005.06.014

• 水循环与水文模拟 • 上一篇    

基于DEM的地形湿度指数 及其应用研究进展

张彩霞1,2, 杨勤科2, 李 锐1,2   

  1. 1. 中国科学院水利部水土保持研究所, 杨凌 712100|
    2. 西北农林科技大学资源环境学院, 杨凌 712100
  • 收稿日期:2005-04-01 修回日期:2005-07-01 出版日期:2005-11-25 发布日期:2005-11-25
  • 通讯作者: 杨勤科E-mail:qkyang@ms.iswc.ac.cn E-mail:qkyang@ms.iswc.ac.cn
  • 作者简介:张彩霞(1974-),女,硕士研究生。主要从事水土保持和土地资源信息与技术方面的研究工作。 E-mail: zhangcx999@yahoo.com.cn,
  • 基金资助:

    中国科学院知识创新重要方向项目“黄土高原水土保持的区域环境效应研究”(KZXCX3-SW-421)。

Advancement in Topographic Wetness Index and Its Application

ZhANG Caixia1,2, YANG Qinke2, LI Rui1,2   

  1. 1. College of Resource and Environment, Northwestern Sci-tech University of Agriculture and Forestry, Yangling 712100, China|
    2. Institute of Soil and Water Conservation, CAS and Ministry of Water Resources, Yangling 712100, China
  • Received:2005-04-01 Revised:2005-07-01 Online:2005-11-25 Published:2005-11-25

摘要:

地形湿度指数以数字高程模型(DEM)为基础,综合考虑了地形和土壤特性对土壤水分分布的影响,在流域土壤水分空间分布的研究中具有重要的理论与应用价值。根据对汇流面积时空变化的分析,地形湿度指数可分为静态、半动态和动态地形湿度指数等类型。在利用该指数评价土壤水分空间分布状况时,需要考虑计算方法与DEM网格单元大小的影响及其普遍适应性等问题。同时,针对黄土高原干旱半干旱区实际的水分循环过程和产流机制与现有地形湿度指数假设条件的差异,提出了地形湿度指数在黄土高原地区的研究设想与应用途径,以期为该区的水土保持和植被恢复研究提供理论和实践支持。

关键词: DEM, 尺度转换, 地形湿度指数, 黄土高原, 土壤水分空间分布

Abstract:

Topographic wetness index, which takes into account the integrated effects of topography and soil hydraulic characters on soil moisture, plays important theoretical and applied potentials in the studies of spatial distribution of soil moisture. Considering the spatial-temporal variation in upslope contributing area, topographic wetness indexes were divided into three types, e.g. static, quasi-dynamic and full dynamic. The effects of computing methods of topographic wetness index and resolution of DEMs as well as the universality of the index should be analyzed discreetly in application of topographic wetness index. At the same time, for the apparent differences between the current assumptions of topographic wetness index and actual water cycling process and runoff mechanism in arid/semi-arid region, the research approaches and the conceive of the application of topographic wetness index are proposed for the Losses Plateau to provide theoretical and practical foundation for the vegetation restoration and the conservation of soil and water in the region.

Key words: DEM, spatial distribution of soil moisture, the Losses, topographic wetness index