Microwave Dielectric Behavior of Wet Soils

Behari, J.

doi:10.1007/1-4020-3288-9

Cited by 90 publications

(55 citation statements)

References 1 publication

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“…Real relative permittivity ε G of inorganic dielectric mineral materials varies from 2 to 15 (cf. Schoen, 1996;Campbell, 2002;Olhoeft, 1974;Behari, 2005;Robinson, , 2004a. However, the available data sets are restricted to limited frequency and temperature ranges and appropriate external measurement conditions were mostly not provided.…”

Section: Dielectric Soil Propertiesmentioning

confidence: 99%

Supercooled interfacial water in fine-grained soils probed by dielectric spectroscopy

Lorek

Wagner

2013

The Cryosphere

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Abstract.Water substantially affects nearly all physical, chemical and biological processes on the Earth. Recent Mars observations as well as laboratory investigations suggest that water is a key factor of current physical and chemical processes on the Martian surface, e.g. rheological phenomena. Therefore it is of particular interest to get information about the liquid-like state of water on Martian analogue soils for temperatures below 0 • C. To this end, a parallel plate capacitor has been developed to obtain isothermal dielectric spectra of fine-grained soils in the frequency range from 10 Hz to 1.1 MHz at Martian-like temperatures down to −70 • C. Two Martian analogue soils have been investigated: a Ca-bentonite (specific surface of 237 m 2 g −1 , up to 9.4 % w/w gravimetric water content) and JSC Mars 1, a volcanic ash (specific surface of 146 m 2 g −1 , up to 7.4 % w/w). Three soil-specific relaxation processes are observed in the investigated frequency-temperature range: two weak highfrequency processes (bound or hydrated water as well as ice) and a strong low-frequency process due to counter-ion relaxation and the Maxwell-Wagner effect. To characterize the dielectric relaxation behaviour, a generalized fractional dielectric relaxation model was applied assuming three active relaxation processes with relaxation time of the ith process modelled with an Eyring equation. The real part of effective complex soil permittivity at 350 kHz was used to determine ice and liquid-like water content by means of the Birchak or CRIM equation. There are evidence that bentonite down to −70 • C has a liquid-like water content of 1.17 monolayers and JSC Mars 1 a liquid-like water content of 1.96 monolayers.

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Section: Dielectric Soil Propertiesmentioning

confidence: 99%

Supercooled interfacial water in fine-grained soils probed by dielectric spectroscopy

Lorek

Wagner

2013

The Cryosphere

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“…Therefore, the objective of numerous experimental, numerical and theoretical investigations is the development of general calibration rules for a broad range of soil textures and structures [Wang and Schmugge, 1980;Topp et al, 1980;Roth et al, 1990Roth et al, , 1992Jacobsen and Schjønning, 1993;Friedman, 1998]. These models are mostly based on the assumption that there is a constant dielectric permittivity in a frequency range around 1 GHz as a function of the volumetric water content [Sihvola, 2000;Behari, 2005;Regalado, 2006].…”

Section: Soil-specific Calibrationmentioning

confidence: 99%

Spatial time domain reflectometry and its application for the measurement of water content distributions along flat ribbon cables in a full‐scale levee model

Scheuermann

Huebner

Schlaeger³

et al. 2009

Water Resources Research

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[1] Spatial time domain reflectometry (spatial TDR) is a new measurement method for determining water content profiles along elongated probes (transmission lines). The method is based on the inverse modeling of TDR reflectograms using an optimization algorithm. By means of using flat ribbon cables it is possible to take two independent TDR measurements from both ends of the probe, which are used to improve the spatial information content of the optimization results and to consider effects caused by electrical conductivity. The method has been used for monitoring water content distributions on a full-scale levee model made of well-graded clean sand. Flood simulation tests, irrigation tests, and long-term observations were carried out on the model. The results show that spatial TDR is able to determine water content distributions with an accuracy of the spatial resolution of about ±3 cm compared to pore pressure measurements and an average deviation of ±2 vol % compared to measurements made using another independent TDR measurement system.

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“…Moisture content is one of the popular parameters to be investigated according to [8][9][10]. This is because the moisture content information is very important in many areas especially in agricultural and civil engineering according to [11].…”

Section: Electromagnetics Property Of Materialsmentioning

confidence: 99%

A Novel of Surface Reflection Method Using Radio-Wave for Soil Density Estimation

Roslee¹,

Shahdan²,

Subari³

2014

PIER M

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Abstract-Soil density is one of the important parameters to be investigated in civil, geological and agricultural works. Unfortunately, the challenging issue is found on a suitable model in determining accurately the soil density. In this article, a new soil density model based on radio-wave surface reflection method is presented. The development of the model is based on result analysis collected from the experiment. Then, comparisons with related theoretical models, Hallikainen and Topp, are performed. The experiment is performed by using a vector network analyzer (VNA) that generates radar signal and recording return loss (S 11 ) from a horn antenna. In the analysis, two new proposed soil density models have shown good agreement for soil density from 1.1 g/cm 3 to 1.7 g/cm 3 for sand and silty sand samples. This is verified when the model able to predict real samples as the one used in the experiment and result shows a very small relative error within 0.05% and 6.87%. Additionally, spectrograms in real time are produced in this study in order to observe more on the soil density. By using the proposed developed models, soil density estimation can be easily determined with minimal data input such as soil type, return loss and reflection coefficient by using regular radio-wave devices.

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Microwave Dielectric Behavior of Wet Soils

Cited by 90 publications

References 1 publication

Supercooled interfacial water in fine-grained soils probed by dielectric spectroscopy

Supercooled interfacial water in fine-grained soils probed by dielectric spectroscopy

Spatial time domain reflectometry and its application for the measurement of water content distributions along flat ribbon cables in a full‐scale levee model

A Novel of Surface Reflection Method Using Radio-Wave for Soil Density Estimation

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