Morphology, grain-size and faunistic composition of the macrotidal beaches of Tierra del Fuego

Morphodynamic models have been applied to macrotidal beaches. They are based on unimodal grain sizes and average dynamic parameters as the wave height and period at the breaker zone. Bimodal gravel beaches do not fit to these models because a) grain size is subject to spatial segregations (gravel an...

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Autores principales: Isla, F.I., Bujalesky, G.G., Galasso, M.L., De Francesco, C.G.
Formato: JOUR
Materias:
Faunistic composition
Macrotidal beaches
Morphology
Tierra del Fuego
beach morphology
beach ridge
coastal morphology
faunistics
grain size
heavy mineral
mollusc
rocky shore
sea level change
spatial analysis
surf zone
tidal cycle
Argentina
Atlantic Coast [South America]
South America
Tierra del Fuego [(PRV) Argentina]
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v60_n3_p435_Isla
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v60_n3_p435_Isla
record_format dspace
spelling todo:paper_00044822_v60_n3_p435_Isla2023-10-03T13:58:07Z Morphology, grain-size and faunistic composition of the macrotidal beaches of Tierra del Fuego Isla, F.I. Bujalesky, G.G. Galasso, M.L. De Francesco, C.G. Faunistic composition Macrotidal beaches Morphology Tierra del Fuego beach morphology beach ridge coastal morphology faunistics grain size heavy mineral mollusc rocky shore sea level change spatial analysis surf zone tidal cycle Argentina Atlantic Coast [South America] South America Tierra del Fuego [(PRV) Argentina] Morphodynamic models have been applied to macrotidal beaches. They are based on unimodal grain sizes and average dynamic parameters as the wave height and period at the breaker zone. Bimodal gravel beaches do not fit to these models because a) grain size is subject to spatial segregations (gravel and granules at the upper beach zones and fine sand at the lower-tide terrace), and b) wave dynamics vary temporarily during the tidal cycle: the beach has a reflective behaviour during high tide and dissipative during low tide. Superimposed to these morphodynamical constraints, along the Atlantic coast of Tierra del Fuego inherited factors control the coastal morphology. In low-lying coasts (South-American Plate portion), the Holocene sea-level fluctuation permitted the construction of beach ridge plains. On high-relief coasts (Scotia Microplate), the same fluctuation have little enough sediment available, and therefore pocket beaches developed between capes and sand accumulations at river outlets. Two areas were found of interest by their heavy mineral content: the Rio Chico beach-ridge plain, and the coastline between Ewan and Ladrillero estuaries. With regard to the molluscan beach composition, rocky bottom specimens dominate at the capes. © 2005 Asociación Geológica Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v60_n3_p435_Isla
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Faunistic composition
Macrotidal beaches
Morphology
Tierra del Fuego
beach morphology
beach ridge
coastal morphology
faunistics
grain size
heavy mineral
mollusc
rocky shore
sea level change
spatial analysis
surf zone
tidal cycle
Argentina
Atlantic Coast [South America]
South America
Tierra del Fuego [(PRV) Argentina]
spellingShingle Faunistic composition
Macrotidal beaches
Morphology
Tierra del Fuego
beach morphology
beach ridge
coastal morphology
faunistics
grain size
heavy mineral
mollusc
rocky shore
sea level change
spatial analysis
surf zone
tidal cycle
Argentina
Atlantic Coast [South America]
South America
Tierra del Fuego [(PRV) Argentina]
Isla, F.I.
Bujalesky, G.G.
Galasso, M.L.
De Francesco, C.G.
Morphology, grain-size and faunistic composition of the macrotidal beaches of Tierra del Fuego
topic_facet Faunistic composition
Macrotidal beaches
Morphology
Tierra del Fuego
beach morphology
beach ridge
coastal morphology
faunistics
grain size
heavy mineral
mollusc
rocky shore
sea level change
spatial analysis
surf zone
tidal cycle
Argentina
Atlantic Coast [South America]
South America
Tierra del Fuego [(PRV) Argentina]
description Morphodynamic models have been applied to macrotidal beaches. They are based on unimodal grain sizes and average dynamic parameters as the wave height and period at the breaker zone. Bimodal gravel beaches do not fit to these models because a) grain size is subject to spatial segregations (gravel and granules at the upper beach zones and fine sand at the lower-tide terrace), and b) wave dynamics vary temporarily during the tidal cycle: the beach has a reflective behaviour during high tide and dissipative during low tide. Superimposed to these morphodynamical constraints, along the Atlantic coast of Tierra del Fuego inherited factors control the coastal morphology. In low-lying coasts (South-American Plate portion), the Holocene sea-level fluctuation permitted the construction of beach ridge plains. On high-relief coasts (Scotia Microplate), the same fluctuation have little enough sediment available, and therefore pocket beaches developed between capes and sand accumulations at river outlets. Two areas were found of interest by their heavy mineral content: the Rio Chico beach-ridge plain, and the coastline between Ewan and Ladrillero estuaries. With regard to the molluscan beach composition, rocky bottom specimens dominate at the capes. © 2005 Asociación Geológica Argentina.
format JOUR
author Isla, F.I.
Bujalesky, G.G.
Galasso, M.L.
De Francesco, C.G.
author_facet Isla, F.I.
Bujalesky, G.G.
Galasso, M.L.
De Francesco, C.G.
author_sort Isla, F.I.
title Morphology, grain-size and faunistic composition of the macrotidal beaches of Tierra del Fuego
title_short Morphology, grain-size and faunistic composition of the macrotidal beaches of Tierra del Fuego
title_full Morphology, grain-size and faunistic composition of the macrotidal beaches of Tierra del Fuego
title_fullStr Morphology, grain-size and faunistic composition of the macrotidal beaches of Tierra del Fuego
title_full_unstemmed Morphology, grain-size and faunistic composition of the macrotidal beaches of Tierra del Fuego
title_sort morphology, grain-size and faunistic composition of the macrotidal beaches of tierra del fuego
url http://hdl.handle.net/20.500.12110/paper_00044822_v60_n3_p435_Isla
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AT galassoml morphologygrainsizeandfaunisticcompositionofthemacrotidalbeachesoftierradelfuego
AT defrancescocg morphologygrainsizeandfaunisticcompositionofthemacrotidalbeachesoftierradelfuego
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