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| Format: | Artículo científico |
| Sprache: | en |
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Academia Brasileira de Ciências
2001
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=32773413 |
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Inhaltsangabe:
- High and Low Frequency Erosive and Constructive Cycles in Estuarine Beaches: an example from Garcez Point, Bahia / Brazil Louis Martin Abílio C.S.P. Bittencourt Geraldo S. Vilas Bôas Félix F. Farias José M.L. Dominguez Guilherme C. Lessa Multidisciplinaria (Ciencias Naturales y Exactas) ebb Bahia canyon Brazil tidal delta Monitoring of the morphodynamic variations of the beaches associated with an estuary contiguous withGarcez Point, Bahia, Brazil, and the superposition of aerial photographs from the region, show the presenceof distinctive erosive and constructive cycles of low and high frequencies. Between 1959 and 1989, oneevent of shoreline erosion and progradation was recognized on the oceanic beaches just outside the estuary.Inside the estuary, an erosion phase at the southern margin coincides with a constructive phase at the otherside, and vice-versa. On the southern estuarine beach, low-frequency cycles of erosion and progradationare also perceived, but with the inverse trend when compared to the contiguous oceanic beach. During thebeach monitoring period (February/1991 to July/1992), the oceanic beach showed retreat rates varying from23.7 m/year, at the channel entrance, to 1.0 m/year, three kilometers away from it. During the same period,the estuarine beach advanced at a rate of 60.3 m/year. The long-term dynamics of the shoreline position inboth sides of the estuarine entrance appears to be related to the position of the channel in the ebb-tidal delta. 2001 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32773413 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.73