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首页> 外文期刊>Physics and chemistry of the earth >Assessing relative soil moisture with remote sensing data: theory, experimental validation, and application to drought monitoring over the North China Plain
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Assessing relative soil moisture with remote sensing data: theory, experimental validation, and application to drought monitoring over the North China Plain

机译：利用遥感数据评估土壤相对湿度：理论，实验验证及其在华北平原干旱监测中的应用

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摘要

Based on physical consideration of land surface energy balance, a theory is proposed for assessing relative soil moisture in the rooting depth with remote sensing data. The basis of the theory is the derivation of relative soil moisture in the rooting zone which is theoretically shown to be derivable from relative evaporation. The relationship derived between the relative soil moisture and relative evaporation is confirmed with experimental data collected with lysimeter measurements and in intensive field campaigns. Further it is shown that the proposed theory can be used to define a drought severity index (DSI) for drought monitoring, when the relative evaporation can be determined with remote sensing data. For this purpose, a demonstration in North China is performed. The used remote sensing data are NOAA/AVHRR which is available on a daily basis, the required meteorological data (wind speed, air temperature, humidity and pressure) are obtained from the operational measurement network of the National Meteorological Center of China. Comparisons between the estimated DSI and the actual measurements of soil moisture confirm the validity and robustness of the proposed theory.
机译：基于地表能量平衡的物理考虑，提出了利用遥感数据评估生根深度土壤相对湿度的理论。该理论的基础是在生根区的相对土壤水分的推导，理论上证明是从相对蒸发推导的。土壤的相对湿度与相对蒸发之间的关系可以通过用溶渗仪测量和野外试验收集的实验数据来证实。进一步表明，当可以用遥感数据确定相对蒸发量时，所提出的理论可用于定义干旱监测的干旱严重性指数（DSI）。为此，在华北进行了示范。每天使用的遥感数据为NOAA / AVHRR，所需的气象数据（风速，气温，湿度和压力）可从中国国家气象中心的运行测量网络获得。 DSI估计值与土壤水分实际测量值之间的比较证实了所提出理论的有效性和稳健性。

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