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Morphodynamics of a Macrotidal Beach: Ajuruteua, Bragança North Brazil

M. A. M. da S. Alves and M. El-Robrini
Journal of Coastal Research
Special Issue No. 39. Proceedings of the 8th International Coastal Symposium (ICS 2004), Vol. II (Winter 2006), pp. 949-951
Stable URL: http://www.jstor.org/stable/25741717
Page Count: 3
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Morphodynamics of a Macrotidal Beach: Ajuruteua, Bragança North Brazil
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Abstract

The Ajuruteua beach (Bragança-PA) is formed by sandy barrier-beach ridges, consisting of well selected unimodal quartz fine sand. Regularly inunded for a macrotidal (6m), it's waves are spilling breakers, and the NE winds are dominant. 10 beach profiles was realizated in dry and wet periods, where it was divided in three sectors: I (SE), II (Central) e III (NW). The Sectors I and III shows a smooth ridge and runnel system, that is filled in the wet period. The Sector II shows a flat profile in both periods. The Ajuruteua beach have dissipative characteristics, shows two morphological states. In the first (wet period), in function of strong spring tides and waves, the sediments are eroded and develop 3m high beach scarps on the foredunes (Sector II), with 25m of retreat. In the second (dry period), the sediments eroded are reincorpored to the beach, through sand ridges migration in direction of the beach, and the formation of a smooth ridge and runnel system. According with the results, the dynamics agents who acts in the morphological conditionants of Ajuruteua beach are macrotidal processes associated to strong waves.

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