Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021WR029871 |
Topographic Wetness Index as a proxy for soil moisture: the importance of flow-routing algorithm and grid resolution | |
H. Riihimä; ki; J. Kemppinen; M. Kopecký; M. Luoto | |
2021-10-11 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | The Topographic Wetness Index (TWI) is a commonly used proxy for soil moisture. The predictive capability of TWI is influenced by the flow-routing algorithm and the resolution of the Digital Elevation Model (DEM) that TWI is derived from. Here, we examine the predictive capability of TWI using 11 flow-routing algorithms at DEM resolutions 1 - 30 m. We analyze the relationship between TWI and field-quantified soil moisture using statistical modelling methods and 5200 study plots with over 46 000 soil moisture measurements. In addition, we test the sensitivity of the flow-routing algorithms against vertical height errors in DEM at different resolutions. The results reveal that the overall predictive capability of TWI was modest. The highest r2 (23.7%) was reached using a multiple-flow-direction algorithm at 2 m resolution. In addition, the test of sensitivity against height errors revealed that the multiple-flow-direction algorithms were also more robust against DEM errors than single-flow-direction algorithms. The results provide field-evidence indicating that at its best TWI is a modest proxy for soil moisture and its predictive capability is influenced by the flow-routing algorithm and DEM resolution. Thus, we encourage careful evaluation of algorithms and resolutions when using TWI as a proxy for soil moisture. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/339910 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | H. Riihimä,ki,J. Kemppinen,et al. Topographic Wetness Index as a proxy for soil moisture: the importance of flow-routing algorithm and grid resolution[J]. Water Resources Research,2021. |
APA | H. Riihimä,ki,J. Kemppinen,M. Kopecký,&M. Luoto.(2021).Topographic Wetness Index as a proxy for soil moisture: the importance of flow-routing algorithm and grid resolution.Water Resources Research. |
MLA | H. Riihimä,et al."Topographic Wetness Index as a proxy for soil moisture: the importance of flow-routing algorithm and grid resolution".Water Resources Research (2021). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论