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Contrasting Morphologic Behaviour at Embayed Beaches in Southern Portugal

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Loureiro, C., Ferreira, O. and Cooper, Andrew (2009) Contrasting Morphologic Behaviour at Embayed Beaches in Southern Portugal. JOURNAL OF COASTAL RESEARCH, 1 (Sp. Iss. 56). pp. 83-87. [Journal article]

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Abstract

Embayed beaches protected by rocky headlands evidence particular morphologic responses to episodic, seasonal and cyclic variations in external forcing depending on the degree of protection and shoreline orientation. This paper is concerned with the morphological behaviour of three embayed beaches (Cabanas Velhas, Boca do Rio and Salema) oil the rocky South coast of Portugal that are subject to a moderate wave climate and have low sediment supply. The selected beaches show different geomorphological settings and have been regularly surveyed for measurement of morphological variability. Results show that when storms impact on an accreted profile with a well-developed berm all three beaches were highly responsive, with differences depending oil coastal orientation and direction of incident waves. Severe erosion with depletion of sand and exposure of underlying layers of gravel and cobble or lag deposits of boulders Occurred under single storms and storm groups. After severe erosion during storms, Cabanas Velhas and Boca do Rio did not show subsequent beach recovery. This may result from sand transport to outside the coastal cell and lack of an effective sediment source that enables recovery. The bi-directional storm wave climate, with storms occurring both from SE and SW, and the reduced headland confinement produced differential sediment displacement along opposing ends of Salema beach. Morphological adjustments, morphodynamic processes and the contrasting behaviour between these three embayed beaches appears to be strongly controlled by geomorphological inheritance.

Item Type:Journal article
Keywords:morphodynamics; storms; beach recovery; geomorphological inheritance
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Environmental Sciences
Research Institutes and Groups:Environmental Sciences Research Institute
Environmental Sciences Research Institute > Coastal Systems
ID Code:1463
Deposited By:Professor Andrew Cooper
Deposited On:02 Dec 2009 13:09
Last Modified:15 Jun 2011 11:17

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