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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Impact of Gypsum on Electromagnetic Properties of Desert Soils
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Impact of Gypsum on Electromagnetic Properties of Desert Soils

机译：石膏对荒漠土壤电磁特性的影响

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摘要

Radar remote sensing of soil requires an understanding about the electromagnetic properties of soils. Propagation velocities and attenuation rates at ground-penetrating radar frequencies (0.25–4 GHz) were measured as a function of soil moisture content for soils from Iraq and Afghanistan. Soil samples in the study include two with and two without gypsum $(hbox{CaSO}_{4} cdot 2hbox{H}_{2} hbox{O})$ as a major mineral component. When measured at 100 $^{ circ}hbox{C}$, volumetric moisture content of gypsum-rich soils ranged from 12% to 24%. In addition to the high moisture content, the propagation velocities were higher than expected, and attenuation rates were lower than expected for soils with moisture contents in this high range. The apparently anomalous relationship between high moisture content and low attenuation rate is explained by the presence and characteristics of gypsum in the soil. Radar signals are not affected by the chemically bound water molecules in gypsum which dehydrates at 100 $^{circ}hbox{C}$. These results show that soil mineralogy is critically important to the interpretation of dielectric properties.
机译：雷达遥感土壤需要了解土壤的电磁特性。测量了探地雷达频率（0.25–4 GHz）下的传播速度和衰减率，它是来自伊拉克和阿富汗的土壤的土壤水分含量的函数。研究中的土壤样品包括两个有和没有石膏的$（hbox {CaSO} _ {4} cdot 2hbox {H} _ {2} hbox {O}）$作为主要的矿物成分。当以100g /箱计算时，富含石膏的土壤的体积含水量为12％至24％。除了水分含量高以外，水分含量在此高范围内的土壤的传播速度也高于预期，衰减速率也低于预期。土壤中石膏的存在和特征解释了高水分含量与低衰减率之间的明显异常关系。雷达信号不受石膏中化学结合的水分子的影响，石膏中的化学结合水分子会在100 $ hbox {C} $时脱水。这些结果表明，土壤矿物学对于介电性质的解释至关重要。

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