IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
Using ground-penetrating radar to investigate the internal structure of Puente del Inca, Mendoza, Argentina
Autor/es:
LENZANO LUIS; LANNUTTI, E; LENZANO M. G.; LENZANO M. G.; BARON, J; BARON, J; LENZANO LUIS; LANNUTTI, E
Revista:
NEAR SURFACE GEOPHYSICS
Editorial:
EUROPEAN ASSOC GEOSCIENTISTS & ENGINEERS
Referencias:
Lugar: Houten (Holanda); Año: 2018 vol. 15 p. 175 - 186
ISSN:
1569-4445
Resumen:
ABSTRACTWe performed ground-penetrating radar measurements to study the internal structure of Puente delInca (Inca Bridge). This natural structure is located in Mendoza, Argentina, and its formation isassociated with deposition of travertine caused by geobiological processes created by hot mineralsprings. The 200-MHz ground-penetrating radar measurements performed on the surface of thebridge allowed us to relate the behaviour of the electromagnetic signal with the presence or absenceof hot spring activity. We also made ground-penetrating radar measurements at 20 MHz to estimatethe propagation velocity and study the bridge?s internal structure. In order to validate the groundpenetratingradar results, we used a soil dielectric sensor to obtain the attenuation and the velocityof the medium. The results showed similar propagation velocities (0.0222 m/ns on average) betweenfield observation (ground-penetrating radar) and independent sensor data, as well as significantattenuation due to the hot spring water, which is the primary element controlling the response of theelectromagnetic signals. As checked through dielectric sensor measurements, the unusually lowelectromagnetic wave velocity is due to polarisation mechanisms related to thermal water, whichcause a very high permittivity value (178.1). However, the medium is not sufficiently dispersive(conductivity=27.7 mS/m; attenuation=3.5 dB/m) to condition the results of ground-penetratingradar measurements if low-frequency antennas (20 MHz) are used.