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(Article of periodic en Anglais - 2013)

Document title

Sediment transport measurements with tracers in very low-energy beaches

Authors(s) and Affiliation(s)

CARRASCO A.R. (1) ; FERREIRA Ó. (1) ; MATIAS A. (1) ; FREIRE P. (2) ; BERTIN X. (3) ; DIAS J.A. (1) ;
(1) CIMA, Univ. Algarve, Faro, PORTUGAL
(2) Lab. Nacional Engenharia Civil, Lisboa, PORTUGAL
(3) UMR 7266 LIENSS CNRS/Univ. de la Rochelle, Inst. du Littoral et de l'Environnement, La Rochelle, FRANCE

Abstract

This study investigates sediment transport at a very low-energy backbarrier beach in southern Portugal, from a spring-to-neap tide period, during fair-weather conditions. Rates and directions of transport were determined based on the application of fluorescent tracer techniques. Wind and currents were collected locally, whereas the dominant small and short-period wind waves were characterized using a morphodynamic modelling system coupling a circulation model, a spectral wave model, and a bottom evolution model, well validated over the study area. Tidal currents (mainly ebb velocities) were found to be the main causative forcing controlling sediment displacements. Transport rates were higher during spring tides, tending towards very small values at neap tides. Results herein reported points towards the distinction between tracer advection and tracer dispersion in this type of environment. Tracer techniques allowed distinguishing the broad picture of transport, but revealed the need for refinement in this type of environments (bi-directional forcing by ebb and flood cycles)

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2013, vol. 38, no6 [pp. 561-569]

Bibliographic references : 1 p.

Collation : 6 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3300

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28163660 : Permanent link - XML version
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