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The Morphodynamics Behaviour of a Cross-Shore Sandbar in a Microtidal Environment, Anjos Cove, Arraial do Cabo, Rio de Janeiro – Brazil

  • João Wagner Alencar CastroEmail author
Chapter
Part of the Coastal Research Library book series (COASTALRL, volume 24)

Abstract

The nearshore environment is a very dynamic and complex system with interaction of waves, currents and sediments movement on the inner continental shelf. Some of the most common morphological features are the cross-shore sandbars. The present work investigate the evolution of an offshore sandbar located off Anjos cove, Rio de Janeiro, within a time span of 55 years, based on 6 bathymetric surveys and the sediment distribution analysis. The bathymetric data were used to evaluate the morphodynamic evolution and to calculate the sediment volume changes. The morphology of studied sandbar area extents up to 2002 m, with a length of 1052 m and average depth between - 1.0 to - 2.0 m, and usually increase both volume and extension in the southwest direction. The difference in area and volume during the studied period was 310,851 m2 and 1157,772 m3 respectively. These results show that the cross-shore sandbar migrated preferable shoreward during moderate to severe storm conditions from the northeast quadrant. The northeast waves are responsible for the sediment transportation and deposition in the sandbar environment. These conditions explain the low rate, 1.72 m/years, of migration in the cross-shore sandbar studied. This rate is lower than usual rates reported to microtidal environments. The morphological feature studied has the same direction northeast - southwest of the dunefields located in the region of Arraial do Cabo and Cabo Frio. Along the years, if the same deposition condition is preserved, it will be expected the formation of a barrier island in the sandbar area.

Keywords

Cross-shore sandbar Morphodynamics Microtidal environments Bathymetrics charts Arraial do Cabo, Brazil 

Notes

Acknowledgements

We would you like to thank Professor Agenor Cunha da Silva and the Geologist Raquel Medeiros Fonseca from Brazilian Navy for the support during the field works on the sea.

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Rio de Janeiro Federal University – UFRJ/National Museum/Department of Geology and Paleontology – Coastal Geology, Sedimentology and Environmental Laboratory – LAGECOSTRio de JaneiroBrazil

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