Dielectric spectroscopy and application of mixing models describing dielectric dispersion in clay minerals and clayey soils
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AuthorGonzález Teruel, Juan Domingo; Jones, Scott B.; Soto Vallés, Fulgencio; Torres Sánchez, Roque; Lebron Robinson, Inmaculada; [et al.]
Research GroupDivisión de Sistemas e Ingeniería Electrónica
Knowledge AreaIngeniería del TerrenoIngeniería EléctricaQuímica-FísicaTecnologías del Medio Ambiente
SponsorsThe authors wish to thank Sally Logsdon for supplying the soils from USDA.
Realizado en/conUniversidad Politécnica de Cartagena; Utah State University; UK Centre for Ecology and Hydrology; The Volcani Center
Bibliographic CitationGonzález-Teruel, J.D.; Jones, S.B.; Soto-Valles, F.; Torres-Sánchez, R.; Lebron, I.; Friedman, S.P.; Robinson, D.A. Dielectric Spectroscopy and Application of Mixing Models Describing Dielectric Dispersion in Clay Minerals and Clayey Soils. Sensors 2020, 20, 6678.
The number of sensors, ground-based and remote, exploiting the relationship between soil dielectric response and soil water content continues to grow. Empirical expressions for this relationship generally work well in coarse-textured soils but can break down for high-surface area and intricate materials such as clayey soils. Dielectric mixing models are helpful for exploring mechanisms and developing new understanding of the dielectric response in porous media that do not conform to a simple empirical approach, such as clayey soils. Here, we explore the dielectric response of clay minerals and clayey soils using the mixing model approach in the frequency domain. Our modeling focuses on the use of mixing models to explore geometrical effects. New spectroscopic data are presented for clay minerals (talc, kaolinite, illite and montmorillonite) and soils dominated by these clay minerals in the 1 MHz–6 GHz bandwidth. We also present a new typology for the way water is held in soils that we ...
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