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DOI: 10.1371/journal.pone.0112151
Title:
Measuring and Modeling the Effect of Surface Moisture on the Spectral Reflectance of Coastal Beach Sand
Author: Corjan Nolet; Ate Poortinga; Peter Roosjen; Harm Bartholomeus; Gerben Ruessink
Source Publication: PLOS ONE
ISSN: 1932-6203
Indexed By: SCI-E
Publishing Year: 2014
Date Published: 2014-11-10
Volume: 9, Issue:11
Language: 英语
Keyword: Beaches ; Sunlight ; Light ; Remote sensing ; Absorption spectroscopy ; Sea water ; Lidar ; Light scattering
Subject in Chinese: 吸收 ; 反射率 ; 散射 ; 海滩/海滨 ; 海滩 ; 吸附作用 ; 激光雷达
Subject: ABSORPTION ; REFLECTANCE ; SCATTERING ; BEACHES ; LIDAR
English Abstract: Surface moisture is an important supply limiting factor for aeolian sand transport, which is the primary driver of coastal dune development. As such, it is critical to account for the control of surface moisture on available sand for dune building. Optical remote sensing has the potential to measure surface moisture at a high spatio-temporal resolution. It is based on the principle that wet sand appears darker than dry sand: it is less reflective. The goals of this study are (1) to measure and model reflectance under controlled laboratory conditions as function of wavelength () and surface moisture () over the optical domain of 350–2500 nm, and (2) to explore the implications of our laboratory findings for accurately mapping the distribution of surface moisture under natural conditions. A laboratory spectroscopy experiment was conducted to measure spectral reflectance (1 nm interval) under different surface moisture conditions using beach sand. A non-linear increase of reflectance upon drying was observed over the full range of wavelengths. Two models were developed and tested. The first model is grounded in optics and describes the proportional contribution of scattering and absorption of light by pore water in an unsaturated sand matrix. The second model is grounded in soil physics and links the hydraulic behaviour of pore water in an unsaturated sand matrix to its optical properties. The optical model performed well for volumetric moisture content 24% ( 0.97), but underestimated reflectance for between 24–30% ( 0.92), most notable around the 1940 nm water absorption peak. The soil-physical model performed very well ( 0.99) but is limited to 4% 24%. Results from a field experiment show that a short-wave infrared terrestrial laser scanner ( = 1550 nm) can accurately relate surface moisture to reflectance (standard error 2.6%), demonstrating its potential to derive spatially extensive surface moisture maps of a natural coastal beach.
Related Link: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0112151&type=printable
Citation statistics:
被引频次[WOS]:13   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.177/globalchange/handle/2HF3EXSE/19425
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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Affiliation: Soil Physics and Land Management, Wageningen University, Wageningen, The Netherlands;Soil Physics and Land Management, Wageningen University, Wageningen, The Netherlands;Laboratory of Geo-information Science and Remote Sensing, Wageningen University, Wageningen, The Netherlands;Laboratory of Geo-information Science and Remote Sensing, Wageningen University, Wageningen, The Netherlands;Department of Physical Geography, Faculty of Geosciences, Utrecht University, Utrecht, The Netherlands

Recommended Citation:
Corjan Nolet,Ate Poortinga,Peter Roosjen,et al. Measuring and Modeling the Effect of Surface Moisture on the Spectral Reflectance of Coastal Beach Sand[J]. PLOS ONE,2014-01-01,9(11)
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