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Vulnerable coastal dynamics and sedimentary - Field of Mangue Seco dunes, Guamaré/RN, NE Brazil.

Authors

  • Marcelo dos Santos Chaves Universidade Federal do Rio Grande do Norte
  • Iracema Miranda da Silveira Universidade Federal do Rio Grande do Norte
  • André Giskard Aquino da Silva Universidade Federal do Rio Grande do Norte
No. 53 (2017)
https://doi.org/10.5354/0719-5370.2017.43252

Abstract

We determined migration rates of three dunes, based on measurements and comparison of volume variation between June, 2013 and May, 2014. The study area is located in Alegria Wind Farm, in Guamaré municipality, located in the septentrional coast of the state of Rio Grande do Norte, Northeastern Brazil. The research applied a combination of measurements using geodetic GPS and sediment collection, which was used to characterize the dune morphodynamics. We generated MDT's using the interpolation points (kriging) and calculated its volume. The volume gained in June 2013 (132.470 m3). We compared the sediment volumes in consecutive months, and the results showed that there was an increase of the dune between June to July (+ 31.545m3) and August to September 2013 (10.341m3 +), and decreased from July to August 2013 (-7.700m3). Despite the reduction in the period from July to August, the final volume of the dune is higher than the initial. Transversal profiles of the dune show that the volume changes happened because of leeward and windward. The wind speed to start sediment transportation (UCT), showed that these NE winds are more effective, and the increase of the volume of the dunes is related to its occurrence. The MDT generated shows that these are barchan dunes. Between June to September 2013 and from January to May 2014, dunes migrated 6m to SW direction and ~ 5m to NW, which results in a movement of 1.5 m / a month and 1.25 m / a month, respectively. According to the weather station of Macau-RN, the UCT speed and the transversal profiles, the highest speed of migration occurred between June to July and August to September. Morphological variation of the dune is influenced by the variation in the frequency of occurrence of NE winds.

Keywords:

dunes, winds, sediments

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How to Cite
dos Santos Chaves, M., Miranda da Silveira, I., & Giskard Aquino da Silva, A. (2017). Vulnerable coastal dynamics and sedimentary - Field of Mangue Seco dunes, Guamaré/RN, NE Brazil. Investigaciones Geográficas, (53), pp. 25–36. https://doi.org/10.5354/0719-5370.2017.43252
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