Improved GPR interpretation through resolution of lateral velocity heterogeneity: Example from an archaeological site investigation

Brown, Jacqueline A.; Nichols, J. D.; Steinbronn, Leah; Bradford, John H.

doi:10.1016/j.jappgeo.2008.08.014

Cited by 14 publications

(9 citation statements)

References 17 publications

(18 reference statements)

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“…However, when the goal is to obtain a two-dimensional velocity distribution, multi-offset acquisitions are required along the whole profile, not at only some selected locations Brown et al, 2009). For such multi coverage GPR surveys, and using standard single-channel apparatus, successive common-offset profiles are performed with varying offsets.…”

Section: Hyperbola-based Velocity Adaptations and Interpolationmentioning

confidence: 99%

Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys

Monnier¹,

Camerlynck

Réjiba

et al. 2011

Geomorphology

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Section: Hyperbola-based Velocity Adaptations and Interpolationmentioning

confidence: 99%

Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys

Monnier¹,

Camerlynck

Réjiba

et al. 2011

Geomorphology

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“…Although the CMP methodology can produce improved images of the subsoil (Yilmaz ), the acquisition and processing of these kind of data are much more time consuming than in the SO methodology, so that CMP surveys are normally limited to a few midpoints or survey lines (Berard and Maillol ; Brown et al . ).…”

Section: Introductionmentioning

confidence: 97%

GPR investigations at an Inca‐Spanish site in Argentina

Bonomo

Osella

Ratto

2013

Near Surface Geophysics

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We present the results of a GPR prospecting carried out at the archaeological site of Batungasta, in the NW region of Argentina. This site was established by the Incas in the 14th century and was later occupied during the Spaniard conquest. Environmental information obtained at this arid zone led us to postulate that parts of the site buildings had been seriously damaged and buried by seasonal flood events as well as aeolian sedimentation. Therefore, we considered applying the GPR method to investigate the existence of buried remains, their architectural characteristics and to provide further evidence about the flows that possibly affected them. This method seemed suitable to attain these goals since it usually provides a good detection capacity for architectural structures and layers in dry environments, as well as good quality maps of the soil. Seven sectors of the site were surveyed using a GPR constant‐offset methodology and 500 MHz antennas. The analysis of the data allowed recognizing electromagnetic patterns that could be associated to the existence of walls. In six of the seven sectors, enclosures formed by rock‐earth and earth walls were detected and mapped, confirming Incaic‐Spanish and Spanish structures, respectively. A sedimentary layer produced by a large flood that covered the structures was detected and mapped, providing evidence of this kind of event and its influence on the site. The maps of this layer were also useful to indirectly visualize the 3D shapes of the discovered walls, which were unclear in many sections of the data and to detect additional anthropogenic structures with very bad preservation conditions. These structures had not been previously identified from analysis of the data sections due to the confusing aspect of the reflections produced at their irregular boundaries.

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“…Velocity analysis is a very important topic and has been long discussed in the seismic field. The approaches for obtaining the velocity information include coring, time domain reflectometry (TDR) measurement [14], [15], and multifold data analysis [16]. The first two methods can be destructive and require extra systems and measurements.…”

Section: Introductionmentioning

confidence: 99%

“…The first two methods can be destructive and require extra systems and measurements. Multifold data analysis uses techniques such as normal moveout (NMO) [17] and residual moveout (RMO) velocity analysis [16] and the setup may be common midpoint, common transmitter, or common receiver. Although velocity analysis based on multifold data has been adopted by some GPR systems, it is not favored by RC bridge deck inspections due to the limited acquisition speed.…”

Section: Introductionmentioning

confidence: 99%

Autofocusing Techniques for GPR Data from RC Bridge Decks

Wei

Zhang

2014

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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According to the Federal Highway Administration, more than a quarter of the bridge decks in the United States are obsolete or deficient and most of them are made of reinforced concrete (RC). Precise decisions for bridge maintenance are in high demand due to the limited budget. Among various nondestructive evaluation techniques, ground penetrating radar (GPR) has gained its popularity for reasons such as high speed and fine resolution. Migration is an important intermediate process for GPR data analysis and its accuracy depends on the velocity or dielectric permittivity estimation of the subsurface. Velocity analysis for commonly adopted bistatic GPR systems is based on an iterative trial-and-error process, which involves a human decision process to obtain the properly migrated data. Besides, for heavily polluted data, it can be hardly possible to perform the visual inspection. Autofocusing techniques are rarely discussed in the field of GPR. In this paper, potential autofocusing metrics are nominated and evaluated by both simulation and experimental data. The effects of noise, aperture width, and crossing rebar signals on the metric performance are investigated and the results demonstrate that the higher-order metrics are the most robust and sensitive autofocusing metrics for the migration of GPR data from RC bridge decks.

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Improved GPR interpretation through resolution of lateral velocity heterogeneity: Example from an archaeological site investigation

Cited by 14 publications

References 17 publications

Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys

Structure and genesis of the Thabor rock glacier (Northern French Alps) determined from morphological and ground-penetrating radar surveys

GPR investigations at an Inca‐Spanish site in Argentina

Autofocusing Techniques for GPR Data from RC Bridge Decks

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