GPR imaging of the internal structure of a sand dune in Rio Grande do Norte State, NE Brazil.

Oliveira, J. G., Medeiros, W. E., Vital, H., Neto, P. X. and Stattegger, K. (2003) GPR imaging of the internal structure of a sand dune in Rio Grande do Norte State, NE Brazil. Journal of Coastal Research . pp. 271-278.

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Abstract

Near the city of Sao Bento do Norte (northern coast of Rio Grande do Norte state, NE Brazil), there is a sand dune that is migrating very fast in the direction of adjacent settling areas. Regionally, winds have mainly directions from E (August to April) and NE (May to July). A ground penetrating radar (GPR) survey was done to characterize the internal structures of the dune and their relationships to the wind directions. Four profiles (E-W, N-S, NE-SW, and SE-NW directions) were performed intersecting at the top of the dune and using the 400 MHz frequency. The practical resolution of GPR data (around 30 cm) allow to distinguish individual foresets. Bedding structures dip with angles varying from 2 to 6 degrees. The dips are largest in the E-W profile, thus confirming that largest dips occur in sections parallel to the dominant wind direction. The water table and several truncation surfaces were identified. Particularly, in the E-W profile, a lateral contact between two dune generations was detected; the older one extending to the west. Possibly, this contact is associated to the beginning of the current migration process of the dune.

Document Type: Article
Keywords: sand dunes ground penetrating radar internal dune structures dune migration NE Brazil ground-penetrating radar time-domain reflectometry water-content
Research affiliation: Kiel University
Refereed: No
ISSN: 0749-0208
Date Deposited: 24 Jan 2012 06:29
Last Modified: 08 Oct 2012 10:35
URI: http://oceanrep.geomar.de/id/eprint/16211

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