Cliff retreat and sea bed morphology under monochromatic wave forcing: Experimental study |
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| Authors: | Bastien Caplain Dominique Astruc Vincent Regard Frédéric Y Moulin |
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| Institution: | aINPT, UPS, IMFT, Université de Toulouse, allée Camille-Soula, 31400 Toulouse, France;bCNRS, IMFT, 31400 Toulouse, France;cUPS (OMP), GET, Université de Toulouse, 14, avenue Edouard-Belin, 31400 Toulouse, France;dCNRS, GET, 31400 Toulouse, France;eIRD, GET, 31400 Toulouse, France |
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| Abstract: | 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 ξ. The various processes of the cliff erosion cycle are depicted. The sea bed evolution mostly depends on the surf similarity parameter ξ. Steep planar (ξ > 0.7), gentle planar (0.5 < ξ < 0.7) and bared (ξ < 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. |
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| Keywords: | Cliff erosion Sea bed profile Experimental modelling |
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