Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2017WR021719 |
Cosmic-ray Neutron Rover Surveys of Field Soil Moisture and the Influence of Roads | |
Schroen, M.1,2; Rosolem, R.2,3; Koehli, M.1,4,5; Piussi, L.6; Schroeter, I.1; Iwema, J.2; Koegler, S.1; Oswald, S. E.7; Wollschlaeger, U.8; Samaniego, L.9; Dietrich, P.1; Zacharias, S.1 | |
2018-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH
![]() |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:9页码:6441-6459 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; England; Italy |
英文摘要 | Measurements of root-zone soil moisture across spatial scales of tens to thousands of meters have been a challenge for many decades. The mobile application of Cosmic Ray Neutron Sensing (CRNS) is a promising approach to measure field soil moisture noninvasively by surveying large regions with a ground-based vehicle. Recently, concerns have been raised about a potentially biasing influence of local structures and roads. We employed neutron transport simulations and dedicated experiments to quantify the influence of different road types on the CRNS measurement. We found that roads introduce a substantial bias in the CRNS estimation of field soil moisture compared to off-road scenarios. However, this effect becomes insignificant at distances beyond a few meters from the road. Neutron measurements on the road could overestimate the field value by up to 40 % depending on road material, width, and the surrounding field water content. The bias could be largely removed with an analytical correction function that accounts for these parameters. Additionally, an empirical approach is proposed that can be used without prior knowledge of field soil moisture. Tests at different study sites demonstrated good agreement between road-effect corrected measurements and field soil moisture observations. However, if knowledge about the road characteristics is missing, measurements on the road could substantially reduce the accuracy of this method. Our results constitute a practical advancement of the mobile CRNS methodology, which is important for providing unbiased estimates of field-scale soil moisture to support applications in hydrology, remote sensing, and agriculture. Plain Language Summary Measurements of root-zone soil moisture across spatial scales of tens to thousands of meters have been a challenge for many decades. The mobile application of Cosmic Ray Neutron Sensing (CRNS) is a promising approach to measure field soil moisture noninvasively by surveying large regions with a ground-based vehicle. Recently, concerns have been raised about a potentially biasing influence of roads. We employed physics simulations and dedicated experiments to quantify the influence of different road types on the CRNS measurement. We found that the presence of roads biased the CRNS estimation of field soil moisture compared to nonroad scenarios. Neutron measurements could overestimate the field value by up to 40 % depending on road material, width, surrounding field water content, and distance from the road. We proposed a correction function that successfully removed this bias and works even without prior knowledge of field soil moisture. Tests at different study sites demonstrated good agreement between corrected measurements and other field soil moisture observations. Our results constitute a practical advancement of the mobile CRNS methodology, which is important for providing unbiased estimates of field-scale soil moisture to support applications in hydrology, remote sensing, and agriculture. |
英文关键词 | road effect field-scale soil moisture cosmic ray neutrons mobile survey COSMOS rover |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448088100036 |
WOS关键词 | UNIVERSAL CALIBRATION FUNCTION ; WATER-CONTENT ; LAND-SURFACE ; SCALE ; SENSORS ; OBSERVATORIES ; DYNAMICS ; PROBES ; MODEL |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
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/21484 |
专题 | 资源环境科学 |
作者单位 | 1.UFZ Helmholtz Ctr Environm Res, Dept Monitoring & Explorat Technol, Leipzig, Germany; 2.Univ Bristol, Fac Engn, Bristol, Avon, England; 3.Univ Bristol, Cabot Inst, Bristol, Avon, England; 4.Heidelberg Univ, Inst Phys, Heidelberg, Germany; 5.Univ Bonn, Inst Phys, Bonn, Germany; 6.Free Univ Bolzano Bozen, Fac Sci & Technol, Bolzano, Italy; 7.Univ Potsdam, Inst Earth & Environm Sci, Potsdam, Germany; 8.UFZ Helmholtz Ctr Environm Res, Dept Soil Phys, Halle, Saale, Germany; 9.UFZ Helmholtz Ctr Environm Res, Dept Computat Hydrosyst, Leipzig, Germany |
推荐引用方式 GB/T 7714 | Schroen, M.,Rosolem, R.,Koehli, M.,et al. Cosmic-ray Neutron Rover Surveys of Field Soil Moisture and the Influence of Roads[J]. WATER RESOURCES RESEARCH,2018,54(9):6441-6459. |
APA | Schroen, M..,Rosolem, R..,Koehli, M..,Piussi, L..,Schroeter, I..,...&Zacharias, S..(2018).Cosmic-ray Neutron Rover Surveys of Field Soil Moisture and the Influence of Roads.WATER RESOURCES RESEARCH,54(9),6441-6459. |
MLA | Schroen, M.,et al."Cosmic-ray Neutron Rover Surveys of Field Soil Moisture and the Influence of Roads".WATER RESOURCES RESEARCH 54.9(2018):6441-6459. |
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