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Observations and Predictions of Wave Runup, Extreme Water Levels, and Medium-Term Dune Erosion during Storm Conditions ArchiMer
Suanez, Serge; Cancouet, Romain; Floc'H, France; Blaise, Emmanuel; Ardhuin, Fabrice; Filipot, Jean-francois; Cariolet, Jean-marie; Delacourt, Christophe.
Monitoring of dune erosion and accretion on the high-energy macrotidal Vougot beach in North Brittany (France) over the past decade (2004–2014) has revealed significant morphological changes. Dune toe erosion/accretion records have been compared with extreme water level measurements, defined as the sum of (i) astronomic tide; (ii) storm surge; and (iii) vertical wave runup. Runup parameterization was conducted using swash limits, beach profiles, and hydrodynamic (Hm0, Tm0,–1, and high tide water level—HTWL) data sets obtained from high frequency field surveys. The aim was to quantify in-situ environmental conditions and dimensional swash parameters for the best calibration of Battjes [1] runup formula. In addition, an empirical equation based on observed...
Tipo: Text Palavras-chave: Macrotidal beach; Runup; Storm; Dune; Erosion; Extreme water level; NAO.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00276/38765/37306.pdf
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Séquences d'évolution morphodynamique des barres intertidales d'une plage macrotidale : l'exemple d'Omaha beach (Normandie, France) ArchiMer
Stepanian, A; Levoy, F.
The present paper deals with the morphodynamics of intertidal bars on Omaha beach, a macrotidal beach located along the Normandy coastline. During two years (defined here as medium-term time-scale), a monthly topographic monitoring has been conducted on this beach. An analysis of the morphological evolution of the ridge and runnel systems is performed and correlated to the forcing conditions (waves and tide) recorded on the lower foreshore. Our results allow to distinguish some morphodynamical evolution sequences with one stage of accretion and one stage of destruction of the bars. In order to discriminate these two stages, an energetic criterion is used. Accretion stages correspond to long periods of fair weather conditions (significant wave height, H-s...
Tipo: Text Palavras-chave: Morphodynamique; Plage macrotidale; Barres et bâches; Normandie; France; Morphodynamics; Macrotidal beach; Ridges and runnels; Normandy; France.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00322/43274/43005.pdf
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