Comparing detection and location performance of perpendicular and parallel broadside GPR antenna orientations

Porsani, Jorge Luís; Slob, Evert; Lima, Robson Santos; Leite, David Nakamura

doi:10.1016/j.jappgeo.2009.12.002

Cited by 39 publications

(14 citation statements)

References 26 publications

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“…The researchers proposed a data processing routine to remove these reflections. Porsani et al [13] presented a study about the effect of the orientation of the transmitting and receiving antennas (unshielded) to map the buried targets. To accomplish this, the antennas were placed both parallel and perpendicular to the GPR profile direction with the advantages and disadvantages of each assessed for mapping the desired targets.…”

Section: Study Area: Iag/usp Geophysical Test Sitementioning

confidence: 99%

Depth Estimates of Buried Utility Systems Using the GPR Method: Studies at the IAG/USP Geophysics Test Site

Poluha¹,

Porsani²,

Almeida³

et al. 2017

IJG

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Identifying underground utilities and predicting their depth are fundamental when it comes to civil engineering excavations, for example, to install or repair water, sewer, gas, electric systems and others. The accidental rupture of these systems can lead to unplanned repair costs, delays in completing the service, and risk injury or death of workers. One way to detect underground utilities is using the GPR-Ground Penetrating Radar geophysical method. To estimate depth, the travel time (two-way travel time) information provided by a radargram is used in conjunction with ground wave velocity, which depends on the dielectric constant of materials, where it is usually assumed to be constant for the area under investigation. This procedure provides satisfactory results in most cases. However, wrong depth estimates can result in damage to public utilities, rupturing pipes, cutting lines and so on. These cases occur mainly in areas that have a marked variation of water content and/or soil lithology, thus greater care is required to determine the depth of the targets. The present work demonstrates how the interval velocity of Dix (1955) can be applied in radargram to estimate the depth of underground utilities compared to the conventional technique of constant velocity applied to the same data set. To accomplish this, synthetic and real GPR data were used to verify the applicability of the interval velocity technique and to determine the accuracy of the depth estimates obtained. The studies were carried out at the IAG/USP test site, a controlled environment, where metallic drums are buried in known positions and depths allowing the comparison of real to estimated depths. Numerical studies were also carried out aiming to simulate the real environment with variation of dielectric constant in depth and to validate the results 727with real data. The results showed that the depths of the targets were estimated more accurately by means of the interval velocity technique in contrast to the constant velocity technique, minimizing the risks of accidents during excavation.

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Section: Study Area: Iag/usp Geophysical Test Sitementioning

confidence: 99%

Depth Estimates of Buried Utility Systems Using the GPR Method: Studies at the IAG/USP Geophysics Test Site

Poluha¹,

Porsani²,

Almeida³

et al. 2017

IJG

Self Cite

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show abstract

“…The IAG/USP test site is a research laboratory for near surface geophysics (pioneer in Brazil), where different targets, for example plastic, concrete, and metal, were buried in the subsoil in order to simulate geotechnical, environmental, and urban construction and utility features. Detailed information about its construction, as well as some geophysical results can be found in Porsani and Sauck (2007), Porsani et al (2006), Porsani et al (2010), Rodrigues and Porsani (2006), Porsani (2011), Santos et al (2010), .…”

Section: Gpr Data Acquisition and Processingmentioning

confidence: 99%

“…GPR is particularly efficient in locating buried targets, for example, steel and plastic pipes, concrete tubes, cables (electric, telephone, and fiber optic), as well as steel and plastic drums (Beliss et al, 2008;Grandjean et al, 2000;Liu et al, 2007;Porsani and Sauck, 2007;Porsani et al, 2006Porsani et al, , 2010Rodrigues and Porsani, 2006;Santos et al, 2010;Zeng and McMechan, 1997).…”

mentioning

confidence: 99%

GPR applied to mapping utilities along the route of the Line 4 (yellow) subway tunnel construction in São Paulo City, Brazil

Porsani

Ruy

Ramos³

et al. 2012

Journal of Applied Geophysics

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“…GPR has proven its ability to provide high-resolution images for strata. Thus, it is useful for investigations in geology, archeology and buried structures and pipelines (Al-Nuaimy et al, 2000;Beauprˆetre et al, 2012;Porsani et al, 2010;Tohge et al, 1998). In environmental pollution investigations, GPR can survey the NAPL leakage distribution (Cassidy, 2007;Greenhouse et al, 1993;Lopes de Castro and Branco, 2003).…”

Section: Introductionmentioning

confidence: 99%

Applying FDEM, ERT and GPR at a site with soil contamination: A case study

Wang

Chen

Tong

et al. 2015

Journal of Applied Geophysics

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Comparing detection and location performance of perpendicular and parallel broadside GPR antenna orientations

Cited by 39 publications

References 26 publications

Depth Estimates of Buried Utility Systems Using the GPR Method: Studies at the IAG/USP Geophysics Test Site

Depth Estimates of Buried Utility Systems Using the GPR Method: Studies at the IAG/USP Geophysics Test Site

GPR applied to mapping utilities along the route of the Line 4 (yellow) subway tunnel construction in São Paulo City, Brazil

Applying FDEM, ERT and GPR at a site with soil contamination: A case study

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