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Modeling shoreline sand waves on the coasts of Namibia and Angola

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dc.contributor Universitat de Vic. Escola Politècnica Superior
dc.contributor Universitat de Vic. Grup de Recerca en Medi Ambient i Alimentació
dc.contributor.author Ribas Prats, Francesca
dc.contributor.author Falqués, Albert
dc.contributor.author Van den Berg, Niels
dc.contributor.author Caballeria, Miquel
dc.date.accessioned 2013-12-18T12:28:00Z
dc.date.available 2013-12-18T12:28:00Z
dc.date.created 2013
dc.date.issued 2013
dc.identifier.citation Francesca RIBAS, Albert FALQUÉS, Niels VAN DEN BERG, Miquel CABALLERIA. "Modeling shoreline sand waves on the coasts of Namibia and Angola" A: International Journal of Sediment Research, Volume 28, Issue 3, September 2013, Pages 338–348 http://dx.doi.org/10.1016/S1001-6279(13)60044-X ca_ES
dc.identifier.issn 1001-6279
dc.identifier.uri http://hdl.handle.net/10854/2598
dc.description.abstract The southwestern (SW) coast of Africa (Namibia and Angola) features long sandy beaches and a wave climate dominated by energetic swells from the Southsouthwest (SSW), therefore approaching the coast with a very high obliquity. Satellite images reveal that along that coast there are many shoreline sand waves with wavelengths ranging from 2 to 8 km. A more detailed study, including a Fourier analysis of the shoreline position, yields the wavelengths (among this range) with the highest spectral density concentration. Also, it becomes apparent that at least some of the sand waves are dynamically active rather than being controlled by the geological setting. A morphodynamic model is used to test the hypothesis that these sand waves could emerge as free morphodynamic instabilities of the coastline due to the obliquity in wave incidence. It is found that the period of the incident water waves, Tp, is crucial to establish the tendency to stability or instability, instability increasing for decreasing period, whilst there is some discrepancy in the observed periods. Model results for Tp = 7–8 s clearly show the tendency for the coast to develop free sand waves at about 4 km wavelength within a few years, which migrate to the north at rates of 0.2–0.6 km yr-1. For larger Tp or steeper profiles, the coast is stable but sand waves originated by other mechanisms can propagate downdrift with little decay. ca_ES
dc.format application/pdf
dc.format.extent 11 p. ca_ES
dc.language.iso eng ca_ES
dc.publisher Elsevier ca_ES
dc.rights (c) 2013 Elsevier. Published article is available at: http://dx.doi.org/10.1016/S1001-6279(13)60044-X
dc.rights Tots els drets reservats ca_ES
dc.subject.other Platges - Erosió ca_ES
dc.title Modeling shoreline sand waves on the coasts of Namibia and Angola ca_ES
dc.type info:eu-repo/semantics/article ca_ES
dc.identifier.doi https://doi.org/10.1016/S1001-6279(13)60044-X
dc.relation.publisherversion http://www.sciencedirect.com/science/article/pii/S100162791360044X
dc.rights.accesRights info:eu-repo/semantics/closedAccess ca_ES
dc.type.version info:eu-repo/publishedVersion ca_ES
dc.indexacio Indexat a SCOPUS
dc.indexacio Indexat a WOS/JCR ca_ES

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