An Improved Microwave Semiempirical Model for the Dielectric Behavior of Moist Soils

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

doi:10.1109/TGRS.2018.2841025

Title: An Improved Microwave Semiempirical Model for the Dielectric Behavior of Moist Soils

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Abstract

Soil semiempirical dielectric models (SEMs) are powerful, and they are generally considered a useful hybrid of both empirical and physical models. In this work, 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 resultsmore »« less

Authors:

^[1];

^[2];

^[1]; Du, Yongming ^[1];

^[1]

Chinese Academy of Sciences (CAS), Beijing (China). State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth
Chinese Academy of Sciences (CAS), Beijing (China). State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth ; Joint Center for Global Change Studies, Beijing (China)

Publication Date:: Tue Jun 26 00:00:00 EDT 2018

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1457759

Grant/Contract Number:: AC05-76RL01830; 41401395

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Geoscience and Remote Sensing

Additional Journal Information:: Journal Volume: 56; Journal Issue: 11; Journal ID: ISSN 0196-2892

Publisher:: IEEE

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; Bound soil water (BSW); free soil water (FSW); microwave; relative complex dielectric constant (CDC); semiempirical dielectric model (SEM)

Citation Formats


                    Liu, Jing, Liu, Qinhuo, Li, Hua, Du, Yongming, and Cao, Biao. An Improved Microwave Semiempirical Model for the Dielectric Behavior of Moist Soils.  United States: N. p., 2018. 
Web.  doi:10.1109/TGRS.2018.2841025.

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                    Liu, Jing, Liu, Qinhuo, Li, Hua, Du, Yongming, & Cao, Biao. An Improved Microwave Semiempirical Model for the Dielectric Behavior of Moist Soils.  United States.  https://doi.org/10.1109/TGRS.2018.2841025

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                    Liu, Jing, Liu, Qinhuo, Li, Hua, Du, Yongming, and Cao, Biao. Tue .  
"An Improved Microwave Semiempirical Model for the Dielectric Behavior of Moist Soils".  United States.  https://doi.org/10.1109/TGRS.2018.2841025.  https://www.osti.gov/servlets/purl/1457759.

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@article{osti_1457759,

  title        = {An Improved Microwave Semiempirical Model for the Dielectric Behavior of Moist Soils},

  author       = {Liu, Jing and Liu, Qinhuo and Li, Hua and Du, Yongming and Cao, Biao},

  abstractNote = {Soil semiempirical dielectric models (SEMs) are powerful, and they are generally considered a useful hybrid of both empirical and physical models. In this work, 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. Lastly, 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.},

  doi          = {10.1109/TGRS.2018.2841025},

  journal      = {IEEE Transactions on Geoscience and Remote Sensing},

  number       = 11,

  volume       = 56,

  place        = {United States},

  year         = {Tue Jun 26 00:00:00 EDT 2018},

  month        = {Tue Jun 26 00:00:00 EDT 2018}

}

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