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| BITTENCOURT,ABÍLIO C.S.P.; LESSA,GUILHERME C.; DOMINGUEZ,JOSÉ M.L.; MARTIN,LOUIS; VILAS BÔAS,GERALDO S.; FARIAS,FÉLIX F.. |
| Monitoring of the morphodynamic variations of the beaches associated with an estuary contiguous with Garcez Point, Bahia, Brazil, and the superposition of aerial photographs from the region, show the presence of distinctive erosive and constructive cycles of low and high frequencies. Between 1959 and 1989, one event 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 other side, and vice-versa. On the southern estuarine beach, low-frequency cycles of erosion and progradation are also perceived, but with the inverse trend when compared to the contiguous oceanic beach. During the beach monitoring period... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Erosive and constructive cycles; Longshore sand transport; Wave refraction; Canyon; Ebb-tidal delta; Bahia/Brazil. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400013 |
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| Bittencourt,Abílio C.S.P.; Dominguez,José M.L.; Martin,Louis; Silva,Iracema R.; de-Medeiros,Karla O.P.. |
| This paper presents a numerical modeling estimation of the sediment dispersion patterns caused by waves inciding through four distinct coastline contours of the delta plain of the Doce River during the Late Holocene. For this, a wave climate model based on the construction of wave refraction diagrams, as a function of current boundary conditions, was defined and was assumed to be valid for the four coastlines. The numerical modeling was carried out on basis of the refraction diagrams, taking into account the angle of approximation and the wave height along the coastline. The results are shown to be comparable with existing data regarding the directions of net longshore drift of sediments estimated from the integration of sediment cores, interpretation of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Past and current sediment dispersion; Wave refraction; Numerical modeling; Holocene; Brazil. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200014 |
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| BITTENCOURT,ABÍLIO C.S.P.; MARTIN,LOUIS; DOMINGUEZ,JOSÉ M.L.; SILVA,IRACEMA R.; SOUSA,DAIANA L.. |
| By using the mean directions of the wave-fronts approaching the Brazilian northeastern coastal stretch comprised between the localities of Real river (Sergipe State) and Galinhos (Rio Grande do Norte State) - coincident with those of the main winds occurring in the area - and their periods, we have defined a wave climate model based on the construction of refraction diagrams. The resulting model of sediment transport, as obtained by numerical modelling from the refraction diagrams, taking into consideration the angle of approach and waves heights along the 10-m isobath, was capable of reproducing the patterns of sediment dispersion provided by geomorphic indicators of the longshore drift. All this coastal region, approximately 900 km in length, is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Littoral drift; Wave refraction; Numerical modelling; Coastal Quaternary evolution; Northeastern Brazilian coast. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300012 |
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