A Study of Topographic Wetness Index Based on Terraces DEM

ZHANG Peng; ZHAO Mudan; XI Jiaqi; WU Yuxin

doi:10.13961/j.cnki.stbctb.2018.01.033

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A Study of Topographic Wetness Index Based on Terraces DEM

- A Study of Topographic Wetness Index Based on Terraces DEM
- Bulletin of Soiland Water Conservation Vol. 38, Issue 1, Pages: 187-191(2018)
- 作者机构：
  
  西北大学城市与环境学院,陕西,西安,710100
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2018.01.033
  CLC：
- Published：2018
- 稿件说明：
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ZHANG Peng, ZHAO Mudan, XI Jiaqi, et al. A Study of Topographic Wetness Index Based on Terraces DEM[J]. Bulletin of Soiland Water Conservation, 2018, 38(1): 187-191.
DOI：

ZHANG Peng, ZHAO Mudan, XI Jiaqi, et al. A Study of Topographic Wetness Index Based on Terraces DEM[J]. Bulletin of Soiland Water Conservation, 2018, 38(1): 187-191. DOI： 10.13961/j.cnki.stbctb.2018.01.033.

摘要

[目的]研究基于梯田DEM的地形湿度指数，为深化黄土高原地区土壤水分的研究提供依据。[方法]以黄土高原地区梯田为研究对象，选择5 m DEM、基于真实田坎方法构建的1 m梯田DEM和基于激光点云数据构建的高精度1 m DEM数据分别对研究样区的地形湿度指数进行表达并作对比分析。[结果]3种不同梯田DEM数据对地形湿度指数的表达有显著差异。①5 m DEM数据仅能表现出地形湿度指数的宏观分布特征，不具备梯田地形特征信息；②基于真实田坎方法构建的1 m梯田DEM能较准确细致地实现对梯田样区地形湿度指数的表达，梯田田面和田坎特征分布明显。但与高精度1 m DEM相比，在单个田面和田坎内部地形湿度指数定量表达有所偏差。[结论]基于真实田坎方法构建出的梯田DEM可以更加准确地表达出梯田区域的地形湿度指数分布特征，但与真实地形相比，在田面和田坎内部的表达上仍然有所偏差，其构建方法需要进一步改进。

Abstract

[Objective] We aim to study topographic wetness index (TWI) based on terraces digital elevation model (DEM)

in order to provide basis for the study of soil water content and runoff capacity.[Methods] Using 5 m resolution DEM

1 m resolution DEM data generated with terrace information (T-DEM) based on the real field method and 1 m resolution DEM data generated from the laser point cloud data (H-DEM)

we analyzed and compared the differences among three TWIs in the terrace fields of the Loess Plateau.[Results] First

the result of 5 m resolution DEM data could show the macroscopic distribution

but it was too coarse to show the terrain feature of terrace. Second

although the 1 m resolution T-DEM data could accurately show the terrain humidity of terraced field and obviously reflect the characteristics of terrace surface and ridge feature

it showed larger deviation compared to H-DEM in the single terrace surface and the ridge.[Conclusion] T-DEM can show the distribution characteristics of the TWI in terraced fields more accurately

but it has larger deviation in terrace surface and ridge in comparison to real terrace. T-DEM's generating method need to be improved in future study.

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