Estimativas do teor de umidade empregando o método GPR: uma avaliação comparativa em experimentos de laboratório e campo

Barbosa, Emílio Eduardo Moreira; Prado, Renato Luiz; Mendes, Rodolfo Moreda; Marinho, Fernando A. M.

doi:10.1590/s0102-261x2010000400012

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…5C). As hipérboles de difração que podem ser observadas se relacionamà presença de discos metálicos que foram colocados em posições específicas visando outros experimentos com reflexão de onda (Barbosa et al, 2010).…”

Section: Os Valores Dos Máximos Das Amplitudes Instantâneas Do Dado Gunclassified

Uso do atributo amplitude instantânea do dado gpr na avaliação do teor de umidade de solos e sedimentos

Prado

Barbosa

Mendes³

et al. 2011

Rev. Bras. Geof.

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ABSTRACT. This paper presents results of a study conducted on laboratory and field in order to analyze the parameter amplitude of electromagnetic wave in qualitative assessment of soil moisture contents. We obtained empirical correlations between instantaneous amplitude of the wave, recorded by GPR -Ground Penetrating Radar, and the values of volumetric sediment moisture contents, obtained by TDR -Time Domain Reflectometer, in laboratory experiment as well as in soil samples in a field experiment. Results showed that there is a strong correlation between environmental moisture contents and instantaneous amplitude parameter of electromagnetic wave.In controlled laboratory conditions, this correlation showed a strong coefficient of determination. However, in the field experiment, the coefficient was only 0.64 due to the small amount of data used. This method is easy to implement through a processing flowchart of rapid execution, and can be used in addition to the velocity attribute usually employed in these correlations.

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Section: Os Valores Dos Máximos Das Amplitudes Instantâneas Do Dado Gunclassified

Uso do atributo amplitude instantânea do dado gpr na avaliação do teor de umidade de solos e sedimentos

Prado

Barbosa

Mendes³

et al. 2011

Rev. Bras. Geof.

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“…They verified that the GPR was efficient in imaging the interface between the alluvial sediments and the crystalline rock, generating subsidies for the design of underground dams. Steelman and Endres (2012), Barbosa et al (2010), Gacitúa et al (2012), Schmalholz et al (2004) and Paixão et al (2006) applied the GPR to estimate the moisture spatial variation. These studies have been conducted both in the field real conditions and in the laboratory.…”

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confidence: 99%

Characterization of the Capibaribe River Dry Bed with Ground Penetrating Radar (GPR)

Brito¹,

Coutinho

Cabral

et al. 2018

RBRH

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For an adequate hydrogeological study of alluvial layers in the semi-arid zone, it is important to know well its geometry and its hydraulics characteristics. Alluvial formations are generally constituted by erosion, transport and sedimentation processes, causing considerable heterogeneity in soil hydraulic parameters and water flow. The present research had as objective to perform a geophysical characterization using the Ground Penetrating Radar -GPR in the dry bed of the Capibaribe river. To the extent that depositional layers exhibit changes in water content, granularity, sediment type and layer orientation, the water table as well as sedimentary structures and lithological contacts tend to be identified, making the method effective for hydrogeology research. The study area comprises alluvial dry river bed of upper Capibaribe river in the municipality of Santa Cruz do Capibaribe. The results showed that GPR was efficient in the imaging of the subsurface contributing to the knowledge of the geometry and the stratigraphy of the aquifer of the dry bed of the river. In the dry bed of the river, with 400 MHz antenna the signal reached a depth of 2.65 m, and with the antenna of 200 MHz, the signal reached a depth of 6.00 m. The capillary fringe was identified at a depth of 3.0m with the use of 200MHz and 400MHz antennas.Keywords: GPR; Alluvium; Semiarid. RESUMOPara um estudo hidrogeológico adequado de camadas de aluvião no semiárido é importante conhecer bem sua geometria e suas propriedades. As formações aluviais são geralmente constituídas por processos de erosão, transporte e sedimentação, causando considerável heterogeneidade nos parâmetros hidráulicos do solo e no fluxo de água. A presente pesquisa teve como objetivo realizar uma caracterização geofísica através do Radar de Penetração no Solo -GPR no leito seco do rio Capibaribe. As mudanças nas camadas no conteúdo de água, granulometria, tipo de sedimento e orientação das camadas, o lençol freático, as estruturas sedimentares e os contatos litológicos tendem ser identificados, o que torna o método eficaz para investigação hidrogeológica. A área de estudo compreende as aluviões do leito seco do alto Capibaribe no município de Santa Cruz do Capibaribe. Os resultados mostraram que o GPR foi eficiente no imageamento da subsuperficie contribuindo para o conhecimento da geometria e da estratigrafia do aquífero do leito. No leito seco do rio, com antena de 400 MHz o sinal atingiu profundidade de 2,65 m e com antena de 200 MHz o sinal atingiu 6,00 m. A franja capilar foi identificada na profundidade de 3,0 m com o uso das antenas de 200MHz e 400MHz.

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Estimativas do teor de umidade empregando o método GPR: uma avaliação comparativa em experimentos de laboratório e campo

Cited by 2 publications

References 6 publications

Uso do atributo amplitude instantânea do dado gpr na avaliação do teor de umidade de solos e sedimentos

Uso do atributo amplitude instantânea do dado gpr na avaliação do teor de umidade de solos e sedimentos

Characterization of the Capibaribe River Dry Bed with Ground Penetrating Radar (GPR)

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