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Registros recuperados: 4
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A reevaluation of the late quaternary sedimentation in todos os Santos Bay (BA), Brazil Anais da ABC (AABC)
LESSA,GUILHERME C.; BITTENCOURT,ABÍLIO C.S.P.; BRICHTA,ARNO; DOMINGUEZ,JOSÉ M. L..
Todos os Santos Bay is a large (<img ALIGN="BOTTOM" BORDER="0" SRC="http:/img/fbpe/aabc/v72n4/0052img1.gif" ALT="$ \approx$"> 1000 km²), structurally controlled tidal bay in northeast Brazil. Three main drainage basins debouch into the bay, providing a mean freshwater discharge of 200 m³/s (prior to 1985), or less than 1% of the spring tidal discharge through the bay mouth. Based on the result of several sedimentological studies performed in the 1970's, five surface sedimentary facies were identified inside the bay, namely i) transgressive siliciclastic marine sand facies; ii) transgressive bay sand-mud facies; iii) a transgressive carbonate marine sand facies; iv) regressive bay-mud facies, and v) regressive fluvial sand facies. The spatial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Estuary; Sediment; Stratigraphy; Holocene.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400008
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A significant longshore transport divergence zone at the Northeastern Brazilian coast: implications on coastal Quaternary evolution Anais da ABC (AABC)
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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High and low frequency erosive and constructive cycles in estuarine beaches: an example from Garcez Point, Bahia/Brazil Anais da ABC (AABC)
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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The tides and tidal circulation of Todos os Santos Bay, Northeast Brazil: a general characterization Anais da ABC (AABC)
LESSA,GUILHERME C.; DOMINGUEZ,JOSÉ M. L.; BITTENCOURT,ABÍLIO C.S.P.; BRICHTA,ARNO.
The Todos os Santos Bay, located on northeastern Brazil, is the second largest coastal bay in the country, after São Marcos Bay. The three main drainage basins convey an average of 120 m³/s of freshwater towards the bay, the majority of it, however, held by a dam in Paraguaçu River since 1985. The original average freshwater inflow was two orders of magnitude smaller than the estimated tidal discharge through the main bay entrance, and the oceanographic characteristics of the bay, as indicated by bay salinity measurements, are clearly marine. The tides are semi-diurnal, and are amplified up the bay by a factor of 1.5. Shallow water constituents become more important as the tide propagates along Paraguaçu Channel and Paraguaçu River, where they generate...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tides; Baía de Todos os Santos; Tidal currents.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200009
Registros recuperados: 4
Primeira ... 1 ... Última
 

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