Analysis of Topographic Index Variance Based on a Small Tested Loess Watershed in Different Evolution Periods

Liu Min; Tang Guoan; Wang Chun; Cui Lingzhou

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Analysis of Topographic Index Variance Based on a Small Tested Loess Watershed in Different Evolution Periods

- Analysis of Topographic Index Variance Based on a Small Tested Loess Watershed in Different Evolution Periods
- Bulletin of Soiland Water Conservation Vol. 26, Issue 2, Pages: 56-60(2007)
- 作者机构：
  
  1. 西北大学城市与资源学系,陕西,西安,710069
  2. 南京师范大学虚拟地理环境教育部重点实验室江苏南京,210097
  3. 温州大学生命与环境科学学院,浙江,温州,325035
- 作者简介：
- 基金信息：
- DOI：
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- Published：2007
- 稿件说明：
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Liu Min, Tang Guoan, Wang Chun, et al. Analysis of Topographic Index Variance Based on a Small Tested Loess Watershed in Different Evolution Periods[J]. Bulletin of Soiland Water Conservation, 2007, 26(2): 56-60.
DOI：

Liu Min, Tang Guoan, Wang Chun, et al. Analysis of Topographic Index Variance Based on a Small Tested Loess Watershed in Different Evolution Periods[J]. Bulletin of Soiland Water Conservation, 2007, 26(2): 56-60. DOI：

摘要

基于人工降雨实验获取的黄土模拟小流域高解析度DEM数据

提取其不同发育阶段的地形指数

分析了黄土小流域降雨侵蚀过程中地形指数的空间分异特征、平均地形指数变化规律及地形指数频率分布曲线特征。研究证明

地形指数空间分布与地形呈现很强的相关性

地形指数均值与坡度均值呈现对数变化关系

地形指数频率分布图随地形变化呈现规律性变化。地形指数空间变异特征分析可为研究流域地形和流域水文相似性提供基础资料。

Abstract

As a physical index to express the information on topography

topographic index is a very important parameter for many physically based hydrological models. This article analyzes the topographic index based on a small tested loess watershed. The topographic index is derived f rom DEMs of the watershed by using the single flow direction method. Result s show that the spatial dist ribution of the topographic index has a high correlation with terrain dist ribution. Average topographic index variance has an exponential relationship with average slope variance.Frequency dist ribution of the topographic index shows a regular change with changed topography. The analysis of the topographic index variance can help us study catchment topography and hydrological similarity.

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