NDLI: Investigating epikarst using low-frequency GPR: example from the Gran Sasso range (Central Italy)

Content Provider	Springer Nature Link
Author	Tallini, Marco Gasbarri, Diego Ranalli, Danilo Scozzafava, Marco
Copyright Year	2005
Abstract	A realistic 3D view of the epikarst is key to understanding karst groundwater phenomena. Ground penetrating radar proved to be highly effective for investigating the epikarst of a sinkhole located in the Gran Sasso karst range (central Italy). Two different low-frequency antennae (100 MHz bistatic shielded and 40 MHz bistatic unshielded) were used. The radar signal interpretation was correlated with field observations of the epikarst and borehole data. Two radar anomaly surfaces were identified, which were correlated with the top and bottom of the epikarst surface. The shape of the two surfaces correlates well with the surface topography of the study sinkhole and with the orientation of its main joints and karren. The work indicated that such a 3D reconstruction could be usefully applied to karst aquifer vulnerability studies.Une vue 3D de l’épikarst constitue un progrès notable pour la compréhension des écoulements karstiques. Le radar géologique s’est révélé très efficace pour reconnaître l’épikarst d’une dépression karstique située dans la chaîne du Gran Sasso (Italie centrale). Deux antennes basse fréquence (100 et 40 MHz) ont été utilisées. L’interprétation du signal radar a été corrélée avec des observations de terrain relatives à l’épikarst et des données de sondage. Deux discontinuités radar ont été identifiées et reconnues comme les surfaces supérieures et inférieures de l’épikarst. La forme des deux surfaces est contrôlée par la surface topographique de la dépression karstique étudiée et par l’orientation des discontinuités principales et des lapiaz. Le travail réalisé a montré qu’une telle reconstitution 3D pouvait être utile pour des études de vulnérabilité à la pollution d’aquifères karstiques.
Starting Page	435
Ending Page	443
Page Count	9
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	65
Issue Number	4
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-01-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Radar géologique Epikarst Ecoulement souterrain Vulnérabilité d’aquifère karstique Italie centrale. Nature Conservation Geoecology/Natural Processes Structural Foundations, Hydraulic Engineering Applied Geosciences
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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