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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing. >An Improved Microwave Semiempirical Model for the Dielectric Behavior of Moist Soils
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An Improved Microwave Semiempirical Model for the Dielectric Behavior of Moist Soils

机译：湿润土壤介电行为的改进微波半经验模型

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摘要

Soil semiempirical dielectric models (SEMs) are powerful, and they are generally considered a useful hybrid of both empirical and physical models. In this paper, the Wang-Schmugge dielectric model is improved to more accurately estimate the relative complex dielectric constants (CDCs) of moist soils. Instead of the Debye relaxation spectrum of liquid water located outside of the soil (i.e., free out-of-soil water) adopted in the Wang-Schmugge model, the Debye relaxation formula related to the free-water component inside the soil [i.e., free soil water (FSW)], which is correlated with the soil texture, is employed in the improved SEM. In addition, the effective conductivity loss term related to both soil texture and soil moisture is introduced to explain the ionic conductivity losses of FSW. Since the soil moisture influence is reduced at high frequencies, the effective conductivity loss term related to only the soil texture is also analyzed for 14-18 GHz. As in the Wang-Schmugge model, the relative CDC of bound soil water varies with the soil volumetric moisture content when the soil moisture is lower than the maximum bound water fraction in the new model, which takes a different approach than the Mironov mineralogy-based SEM. The proposed model obtains better fitting results than the three most widely employed SEMs. The improved model exhibits a significantly improved accuracy with a higher correlation coefficient (R2), a closer 1:1 relationship, and a lower root-mean-square error, including in the L-band, and especially in the imaginary part of the L-band.
机译：土壤半经验电介质模型（SEM）功能强大，通常被认为是经验模型和物理模型的有用组合。本文对Wang-Schmugge介电模型进行了改进，以更准确地估计潮湿土壤的相对复介电常数（CDC）。取代了Wang-Schmugge模型中采用的位于土壤外部的液态水（即游离的土壤外水）的Debye弛豫谱，该Debye弛豫公式与土壤中的自由水成分有关[即，与土壤质地相关的游离土壤水（FSW）]用于改进的SEM。此外，引入了与土壤质地和土壤水分相关的有效电导率损失术语，以解释FSW的离子电导率损失。由于在高频下减少了土壤水分的影响，因此还针对14-18 GHz分析了仅与土壤质地有关的有效电导率损失项。与Wang-Schmugge模型一样，当土壤水分低于新模型中的最大束缚水含量时，束缚土壤水的相对CDC随土壤体积含水量而变化，这与基于Mironov矿物学的方法不同扫描电镜与三个应用最广泛的SEM相比，该模型获得了更好的拟合结果。改进的模型具有更高的相关系数（R n 2）、1:1关系更紧密，并且均方根误差更低，包括在L波段，尤其是在L波段的虚部。

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  • 来源
    《IEEE Transactions on Geoscience and Remote Sensing.》 |2018年第11期|6630-6644|共15页
  • 作者

    Jing Liu; Qinhuo Liu; Hua Li; Yongming Du; Biao Cao;

  • 作者单位

    State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China;

    State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China;

    State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China;

    State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China;

    State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Dielectrics; Soil moisture; Conductivity; Soil measurements; Water; Soil texture;

    机译：介电;土壤水分;电导率;土壤测量;水;土壤质地;

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