Integrated near-surface geophysical survey of the Cathedral of Mallorca

Pérez-Gracia, Vega; Caselles, J. O.; Clapés, J.; Osorio, R.; Martínez, Guillermo; Cañas, J. A.

doi:10.1016/j.jas.2009.03.001

Cited by 41 publications

(16 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This technique is considered to be one of the most practical and faster device to carry out a geoelectrical exploration in such terrain. Besides, it does not require any contact with the ground (Guerin et al, 1996;Perez-Gracia et al, 2009). Therefore, the method was selected in order to identify differential ranges of electrical layers or nonhomogenous geological mediums within the penetration depth of 0-6 m. Additionally, the method is quite suitable for detecting different subsurface objects, buried channels, underground gaps and other uses in archaeological exploration (McNeill, 1980(McNeill, , 1990.…”

Section: Electromagnetic Surveymentioning

confidence: 99%

Contribution of the geophysical methods in characterizing the water leakage in Afamia B dam, Syria

Al-Fares

2011

Journal of Applied Geophysics

View full text Add to dashboard Cite

Section: Electromagnetic Surveymentioning

confidence: 99%

Contribution of the geophysical methods in characterizing the water leakage in Afamia B dam, Syria

Al-Fares

2011

Journal of Applied Geophysics

View full text Add to dashboard Cite

“…The shielded antennas used in these preliminary evaluations were characterised by nominal centre frequencies of 200 MHz, 500 MHz, 800 MHz and 1 GHz. Resolution and penetration depth of high frequency antennas are experimentally described by Rial (2007), Pérez-Gracia et al (2008) and Pérez Gracia et al (2009a) and Rial et al (2009a,b,c). The experimental results seem to indicate that, in the case of the higher frequencies, it is possible to discriminate shallow close targets embedded in the medium separated horizontally between 0.6 λ -0.8 λ. Vertical resolution was found between 0.5 λ and λ.…”

Section: Equipment and Experimental Settingsmentioning

confidence: 96%

“…These recorded anomalies could be associated to different targets embedded in the medium or to changes in the physical parameters of the medium. This survey is usually applied to shallowsurface prospecting (e.g., Daniels, 2004;Pérez-Gracia et al, 2009a) due to the quick radar data acquisition and the accurate results. 3D radar images and isosurfaces of the inner medium could be also obtained by interpolating the 2D radar diagrams obtained in the profiles (e.g., Novo, 2009).…”

Section: Ground Penetrating Radarmentioning

confidence: 99%

Forestry applications of ground-penetrating radar

Lorenzo

Pérez-Gracia²,

Novo³

et al. 2010

For. syst.

Self Cite

View full text Add to dashboard Cite

Ground-penetrating radar (GPR) is a geophysical and close-range remote sensing technique based on the use of radar pulses to obtain cross-section images of underground features. This method is characterized by the transmission of an electromagnetic short length pulse (1-2 ns), presenting a centre frequency ranging from 10 MHz to 2.5 GHz. The principles of GPR operation are based on the ability of low frequency radar waves to penetrate into a non-conductive medium, usually subsoil, but also walls, concrete or wood. Those waves are detected after suffering a reflection in electromagnetic discontinuities of the propagation medium. Therefore, this is a suitable method to study changes in those physical properties, and also to characterize different mediums and the reflective targets providing information about their physical properties. The aim of this work is to describe and demonstrate different applications of GPR in forestry, showing the obtained results together with their interpretation. Firstly, in this paper, it is illustrated how GPR is able to map shallow bedrock, subsoil stratigraphy and also to estimate shallow watertable depth. Secondly, different tree trunks as well as dry timber are analyzed, evaluating the different radar data obtained in each particular case, and observing differences in their electromagnetic properties related to the GPR response. Finally, several measurements were taken in order to analyze the use of GPR to detect tree root systems using polarimetric techniques, being possible to detect medium and big size roots, together with groups of small roots.Key words: GPR, remote sensing, bedrock, watertable, trunk, root system. Resumen Aplicaciones forestales del radar de subsueloEl geo-radar o radar de subsuelo (GPR), es una técnica de teledetección cercana que puede emplearse como herramienta de prospección geofísica y que se fundamenta en la emisión de un pulso electromagnético de muy corta duración (1-20 ns) caracterizado por una frecuencia central que puede variar entre los 10 MHz y los 2,5 GHz, en función de la antena seleccionada. Tras su emisión mediante una antena transmisora, las ondas de radar experimentan reflexiones en las discontinuidades electromagnéticas existentes en el medio por el que se propagan, siendo detectadas por una segunda antena receptora. El análisis de las reflexiones puede utilizarse para caracterizar tanto el medio de propagación como los reflectores, por lo que resulta un método adecuado para el estudio de determinadas propiedades físicas. El objetivo principal de este trabajo es mostrar diferentes aplicaciones del GPR en el ámbito forestal. Para ello se exponen los fundamentos básicos del método y su aplicabilidad como herramienta versátil en el ámbito forestal, así como posibles resultados que se pueden obtener en casos concretos. Como primera aplicación se presentan dos ejemplos que ilustran la capacidad de este método para detectar sustratos rocosos a poca profundidad, para analizar la estratigrafía superficial de un suelo y para localizar el n...

show abstract

“…In addition, GPR is the first technique in the investigation of standing cultural monuments, which have historical and artistic importance. (Gracia et al, 2000;Leckebusch, 2000;Leucci, 2002;Barilaro et al, 2007;Blanco et al, 2008;Perez-Gracia et al, 2009). In the context of restoration and conservation, this method can also be applied to obtain principal information about certain types of structural damage, including cracks and fissures within the construction.…”

Section: Introductionmentioning

confidence: 99%