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Laboratory spectroscopy experiment: Spectral reflectance of beach sand as function of surface moisture content with sample of beach sand collected from the Sand Motor, the Netherlands

机译:实验室光谱实验:从荷兰Sand Motor收集的沙滩沙样品将沙滩沙的光谱反射率作为表面水分含量的函数

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摘要

Spectral reflectance of beach sand (350-2500 nm) under different moisture conditions at 1 nm interval, obtained by a laboratory spectroscopy experiment.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.
机译:通过实验室光谱实验获得的,在不同湿度条件下以1 nm的间隔在350-2500 nm处的沙滩砂的光谱反射率。光学遥感具有以高时空分辨率测量表面湿度的潜力。它基于以下原理:湿沙比干沙看起来更暗:反射性较小。这项研究的目标是(1)在受控实验室条件下,根据350-2500 nm光学范围内的波长()和表面水分()的函数,对反射率进行测量和建模,以及(2)探索我们实验室的意义准确绘制自然条件下表面水分分布的发现。进行了实验室光谱学实验,使用沙滩砂在不同的表面湿度条件下测量光谱反射率(间隔为1 nm)。在整个波长范围内观察到干燥后反射率的非线性增加。开发并测试了两个模型。第一个模型以光学为基础,描述了不饱和砂基质中孔隙水对光的散射和吸收的比例贡献。第二个模型以土壤物理为基础,并将非饱和砂基质中孔隙水的水力行为与其光学特性联系起来。

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    Nolet, C.; Roosjen, P.;

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  • 年度 2014
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