Water content evaluation in unsaturated soil using GPR signal analysis in the frequency domain

Benedetto, Andrea

doi:10.1016/j.jappgeo.2010.03.001

Cited by 104 publications

(65 citation statements)

References 43 publications

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“…In that respect, van der Kruk (2006) and van der Kruk et al (2010) developed an inversion method of dispersed waveforms trapped in a surface waveguide (i.e., when soil is layered by freezing, thawing or by a wetting front) for retrieving its dielectric permittivity and thickness. Benedetto (2010) used a Rayleigh scattering based method for directly determining the soil moisture, without the need of a petrophysical relationship and calibration of the GPR system.…”

Section: Introductionmentioning

confidence: 99%

Validation of ground penetrating radar full-waveform inversion for field scale soil moisture mapping

Minet

Bogaert

Vanclooster

et al. 2012

Journal of Hydrology

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Ground penetrating radar (GPR) is an efficient method for soil moisture mapping at the field scale, bridging the scale gap between small-scale invasive sensors and large-scale remote sensing instruments. Nevertheless, commonly-used GPR approaches for soil moisture characterization suffer from several limitations and the determination of the uncertainties in GPR soil moisture sensing has been poorly addressed. Herein, we used an advanced proximal GPR method based on full-waveform inversion of ultra-wideband radar data for mapping soil moisture and uncertainties in the soil moisture maps were evaluated by three different methods. First, GPRderived soil moisture uncertainties were computed from the GPR data inversion, according to measurements and modeling errors and to the sensitivity of the electromagnetic model to soil moisture. Second, the reproducibility of the soil moisture mapping was evaluated. Third, GPR-derived soil moisture was compared with ground-truth measurements (soil core sampling). The proposed GPR method appeared to be highly precise and accurate, with spatially averaged GPR inversion uncertainty of 0. and an uncertainty of 0.0233 m 3 m −3 when compared with ground-truth measurements. These uncertainties were mapped and appeared to be related to some local model inadequacies and to small-scale variability of soil moisture. In a soil moisture mapping framework, the interpolation was found to be the determinant source of the observed uncertainties. The proposed GPR method was proven to be largely reliable in terms of accuracy and precision and appeared to be highly efficient for soil moisture * julien.minet@uclouvain.be mapping at the field scale.

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Section: Introductionmentioning

confidence: 99%

Validation of ground penetrating radar full-waveform inversion for field scale soil moisture mapping

Minet

Bogaert

Vanclooster

et al. 2012

Journal of Hydrology

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“…Supõe-se que este fenômeno decorre da maior mobilidade dos íons presentes no dielétrico (sulfato de cálcio), uma vez que a resposta dielétrica de alguns materiais, em frequências abaixo do visível e do ultravioleta, é influenciada pela componente iônica (Benedetto, 2010). Na Figura 3 se encontram os valores da capacitância para o período de 90 h. T -tensão, kPa; Cap -capacitância, µF…”

Section: Figura 2 Comportamento Da Capacitância Sob Diferentes Tensõesunclassified

“…Na Figura 5 são mostrados os valores diários de tensão ao longo do ciclo da cultura para os respectivos métodos de manejo. A Figura 5A e 5B refere-se ao tratamento submetido à (Benedetto, 2010).…”

Section: Figura 2 Comportamento Da Capacitância Sob Diferentes Tensõesunclassified

“…Esses sensores têm sido empregados para determinar a umidade do solo, devido ao valor da constante dielétrica da água. Segundo alguns autores, Rusiniak (2002), Chang et al (2007), Kumhála et al (2008), Frangi et al (2009), Benedetto (2010) e Monsen-Nia et al (2010), este valor é de 78-80, em contraste com o solo, cujo valor pode chegar a até 14. Assim, a constante dielétrica é altamente relacionada com o teor de água no solo (Kizito et al, 2008).…”

Section: Introductionunclassified

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Manejo da irrigação utilizando sensor da umidade do solo alternativo

Freitas

Carvalho

Braga

et al. 2012

Rev. bras. eng. agríc. ambient.

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R ESU M OUm sensor alternativo utilizando a medida da capacitância para determinação da umidade do solo foi desenvolvido e calibrado em laboratório, e avaliado por meio da comparação com tensiômetros, no manejo da irrigação da cultura do feijoeiro. Utilizou-se um delineamento inteiramente casualizado com 5 repetições e esquema fatorial com dois métodos de manejo (alternativo e tensiometria) além tensões de água no solo (20, 40 e 60 kPa). Observou-se que, independente do método empregado, a produção do feijoeiro foi maior quando submetido a tensão de 39 kPa; entretanto, o manejo da irrigação utilizandose o método alternativo levou a um número maior de irrigações e também do volume de água aplicado, com consequente redução da eficiência do uso da água em comparação com o uso de tensiômetros. Palavras-chave: capacitância, feijão, tensão de água no soloIrrigation scheduling using alternative soil moisture sensor A B ST R A C T An alternative sensor using a capacitance measurement for determining soil moisture was developed and calibrated in the laboratory and evaluated by comparison with tensiometers in the irrigation of common bean. A completely randomized design was used with five replications and a factorial with two methods of management (alternative and tensiometer) and soil water tensions (20, 40 and 60 kPa). It was observed that regardless of the method, the bean yield was higher when subjected to stress of 39 kPa, however, irrigation management using the alternative method led to a greater number of irrigation and also the volume of water applied, with consequent reduction in water use efficiency compared to the use of tensiometers.

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“…Further studies were carried out by Wollschlager and Roth (2005)0 in order to evaluate changes of volumetric water content from Ground-Penetrating Radar reflections. More recently, Benedetto (2006) 0analyzed the behavior of the center frequency of the signal for different values of water content in unsaturated soil. In general, most of the works are based in the relation existent between water content and GPR wave velocity (e.g.…”

Section: Introductionmentioning

confidence: 99%