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Discussion papers | Copyright
https://doi.org/10.5194/nhess-2018-173
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Jul 2018

Research article | 10 Jul 2018

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Numerical and remote techniques for operational beach management under storm group forcing

Verónica Morales-Márquez1, Alejandro Orfila1, Gonzalo Simarro2, Lluís Gómez-Pujol3, Amaya Álvarez-Ellacuría1, Daniel Conti1, Álvaro Galán4, Andrés F. Osorio5, and Marta Marcos1,6 Verónica Morales-Márquez et al.
  • 1IMEDEA (UIB-CSIC), Mediterranean Institute of Advanced Studies, St. Miquel Marquès 21, 07190, Esporles, Illes Balears, Spain
  • 2ICM, Institute of Marine Sciences, Passeig Marítim de la Barceloneta 37–49, 08003 Barcelona, Catalunya, Spain
  • 3Earth Sciences Research Group, Department of Biology, University of the Balearic Islands, Ctra. Valldemossa km 7.5, 07122 Palma, Illes Balears, Spain
  • 4ETSI Caminos, Canales y Puertos, University of Castilla-La Mancha, Av. Camilo José Cela s/n, 13071 Ciudad Real, Castilla-La Mancha, Spain
  • 5OCEANICOS Research Group, Universidad Nacional de Colombia Cr. 80, 65-223 Medellin, Colombia
  • 6Department of Physics, University of the Balearic Islands, Ctra. Valldemossa km 7.5, 07122 Palma, Illes Balears, Spain

Abstract. The morphodynamic response of a microtidal beach under a storm group is analyzed, and the effects of each individual event inferred from a numerical model, in situ measurements and video imaging. The first storm, with moderate conditions (Hs~1m during 6h), eroded the aerial beach and generated a submerged sandbar in the breaking zone. The bar is further directed offshore during the more energetic second event (Hs=3.5m and 53h). The third storm, similar to the first one, hardly affected the beach morphology, which stresses the importance of the beach configuration previous to a storm. The volume of sand mobilized during the storm group was around 17.65m3/m. During the following months, which were characterized by mild wave conditions, the dry beach recovered half of the volume of sand that was transported offshore during the storm group (~9.27m3/m). The analysis of beach evolution shows two different characteristic time scales for the erosion and the recovery processes associated with storm and mild conditions respectively. Besides, the response depends largely on the previous beach morphological state. The work also stresses the importance of using different tools (video-monitoring, modeling and field campaign) to analyze beach morphodynamics.

Verónica Morales-Márquez et al.
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Verónica Morales-Márquez et al.
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Short summary
This work analyzes the response of a beach under a series of storms using a numerical model, in situ measurements and video imaging. Time recovery after storms is a key issue for local beach managers who are pressed by touristic stakeholders to nourish the beach after energetic process in order to reach the quality standards required by beach users.
This work analyzes the response of a beach under a series of storms using a numerical model, in...
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