ABSTRACT

Rosa, M.L.C.C; Barboza, E.G.; Menegon, B.S.; Frota, P.C.; and Anoni, R.A.O., 2016. Geological evolution and inundation hazard: an analysis through geotechnologies. In: Vila-Concejo, A.; Bruce, E.; Kennedy, D.M., and McCarroll, R.J. (eds.), Proceedings of the 14th International Coastal Symposium (Sydney, Australia). Journal of Coastal Research, Special Issue, No. 75, pp. 1227 - 1231. Coconut Creek (Florida), ISSN 0749-0208.

In the southern coastal plain of Rio Grande do Sul, southern Brazil, part of the city of Santa Vitória do Palmar was studied to analyze inundation hazard and its relation to geological evolution. Remote sensing, GNSS, total station surveys, laser scanning and photogrammetric reconstructions with a low cost UAV were combined and compared aiming at defining four main units with different levels of inundation susceptibility, which correspond to geological units of different ages. The allogenic factor related to the development of these units is sea level, which controls lagoon level, and determines that younger areas have higher inundation susceptibility. An autogenic control was also verified and is related to the dynamics of the lagoon system, where spits are higher and have a lower susceptibility when compared to the plains of the same age.

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