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Cliff retreat and sea bed morphology under monochromatic wave forcing: Experimental study

Caplain, Bastien and Astruc, Dominique and Regard, Vincent and Moulin, Frédéric Cliff retreat and sea bed morphology under monochromatic wave forcing: Experimental study. (2011) Comptes Rendus Geoscience, 343 (7). 471-477. ISSN 1631-0713

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.crte.2011.06.003


Wave flume experiments have been performed to investigate a sandy cliff recession under monochromatic wave forcing. We varied the wave climate through the wave energy flux F and the surf similarity parameter j. The various processes of the cliff erosion cycle are depicted. The sea bed evolution mostly depends on the surf similarity parameter j. Steep planar (j > 0.7), gentle planar (0.5 < j < 0.7) and bared (j < 0.5) profiles are observed. We observed different bar dynamics, including steady and unsteady self-sustained oscillating states. Then we analyze the role of the eroded material on the cliff recession rate. We show that the cliff recession rate increases with the wave energy flux. Moreover, for a given wave energy flux, it is larger for a gentle planar profile than for a bared profile. However it is similar for both a bared profile and a steep planar profile. The cliff recession rate is not a monotonic function of the cliff height as the type of bottom profile influences the wave energy at the cliff.

Item Type:Article
Additional Information:Thanks to Elsevier Masson editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Comptes Rendus Geoscience website: http://dx.doi.org/10.1016/j.crte.2011.06.003
HAL Id:hal-03537452
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
PRES Université de Toulouse - Institut National des Sciences de l’Univers (INSU) - SHOM, Service hydrographique et océanographique de la marine (‘‘reliefs de la Terre program’’)
Deposited On:25 Nov 2013 11:12

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