The complex dielectric constant of Iraqi soils as a function of water content and texture

Abdulla, Shahab; Mohammed, AS; Al‐Rizzo, Hussain M.

doi:10.1109/36.7720

Cited by 10 publications

(3 citation statements)

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“…Soil dielectric models relating the dielectric permittivity of a soil to its physical parameters are the essential part of algorithms for retrieving soil moisture from remote sensing data. Due to this reason, numerous experimental programs have been conducted in order to investigate the dielectric behavior of soil-water mixtures in the microwave region (e.g., Abdulla et al, 1988;Bobrov et al, 1989;Boyarskii and Tikhonov, 1995;Boyarskii et al, 2002;Curtis, 2001;Hallikainen et al, 1985;Hipp, 1974;Hoekstra and Delaney, 1974;Ilyin and Sosnovskiy, 1994;Jackson, 1990;Kleshchenko, 2002;Krotikov, 1962;Leschanskiy et al, 1971;Mätzler, 1998;Mironov et al, 1995Mironov et al, , 1997Mironov et al, , 2004Peplinski et al, 1995;Polyakov et al, 1994;Sabburg et al, 1997;Wang, 1980). Soils are random media consisting of soil particles, air voids, and liquid water.…”

Section: Experimental Studiesmentioning

confidence: 99%

Microwave radiometry of vegetation canopies

Milshin¹

2006

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Section: Experimental Studiesmentioning

confidence: 99%

Microwave radiometry of vegetation canopies

Milshin¹

2006

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“…The primary application of this work is to the in situ measurement of the complex dielectric constant of various soil types. Most soil measurements are made by packing samples into coaxial lines or waveguides [ 5 ] , [6], and the sample preparation must be done very carefully. Other in situ methods involving various antenna configurations have been suggested [7], but the two-wire transmission line configuration is attractive because of its large bandwidth and simplicity.…”

Section: Introductionmentioning

confidence: 99%

Propagation along a two-wire line located at the air-Earth interface

Anderson¹

1990

IEEE Trans. Geosci. Remote Sensing

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A simple quasi-static expression has been derived for the propagation constant of a two-wire transmission line located at the airearth interface. A numerical solution of the mode equation shows that the quasi-static approximation is valid when the wire separation is much less than a free-space wavelength. The quasi-static approximation can he used to determine the complex dielectric constant of the earth from measurements of either the propagation constant or the characteristic impedance of the transmission line.

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“…From Table 1, for the majority of the soil-related materials, the dielectric constant is in the range from 3 to 5, with iron oxide and alumina exhibiting slightly higher values. It is interesting to note that Abdulla et al ( 5 ) and Ponizovsky et al ( 6 ) showed that Topp’s equation may be too simplistic, and that soil texture and density also influence the dielectric constant. This is reinforced by other models relating the soil dielectric constant to porosity (which is related to density) as an independent variable in addition to water content ( 7 – 9 ).…”

mentioning

confidence: 99%

Use of Low-Activity Nuclear Density Gauge in Iron Oxide-Rich Soils

Londynsky¹,

Ooi

2022

Transportation Research Record: Journal of the Transportation R

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Nuclear density gauges (NDG) have been widely used for field compaction control. However, their shortcomings include the burden of licensing with nuclear regulatory agencies, gauge maintenance, storage and transportation restrictions, requirement to wear dosimeters, and radiation safety training. A recently developed low-activity NDG (LANDG) alternative utilizes a low-strength gamma ray source to measure soil density that is Nuclear Regulatory Commission exempt in the U.S.A. and its territories. An accompanying non-nuclear moisture probe yields the moisture content by measuring the dielectric constant of the soil. This study aims to compare the LANDG results with those of the NDG in two common soil types on the island of Oahu, Hawaii: volcanic soils and coralline soils. Coralline soils are partially broken down remains of coral comprised primarily of calcium carbonate. Volcanic soils are basalt derivatives rich in iron oxide and the question arises as to whether the iron oxide will affect the dielectric value resulting in erroneous moisture content measurements. This research shows that the LANDG and NDG measurements of total unit weight are in good agreement for both soils. The moisture content measurements from the LANDG’s accompanying moisture probe are in good agreement with those of the NDG in coralline soils but are less satisfactory in volcanic soils. A plausible explanation is offered. Moisture offsets may be applied to the moisture probe’s measurements to reduce scatter and increase accuracy. Instances of when this is required are suggested.

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The complex dielectric constant of Iraqi soils as a function of water content and texture

Cited by 10 publications

References 10 publications

Microwave radiometry of vegetation canopies

Microwave radiometry of vegetation canopies

Propagation along a two-wire line located at the air-Earth interface

Use of Low-Activity Nuclear Density Gauge in Iron Oxide-Rich Soils

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