Consulta: subjectFacets:"Storm"
Registros recuperados: 4
Data/hora: 06/06/2024 04:30:44

Empirical Parameterization of Wave Runup and Dune Erosion during Storm Conditions on a Natural Macrotidal Beach
Provedor de dados: 5
Autores: Suanez, Serge; Blaise, Emmanuel; Cancouet, Romain; Floc'H, France.
An experimental study based on field measurements for runup parameterization was conducted on a high energy macrotidal beach located on North Brittany (Vougot Beach). The approach was based on morphological and hydrodynamic high frequency monitoring collected between 2008 and 2013. The aim was to quantify in-situ environmental conditions and dimensional swash parameters for the best calibration of Battjes (1971) runup formula. In addition, an empirical equation based on observed tidal water level and offshore wave height was produced to estimate extreme water levels defined as the sum of (i) astronomic tide, (ii) storm surge, and (iii) vertical wave runup. A good correlation between this empirical equation (1.01H(mo)xi(o)) and field runup measurements...
Tipo: Text
Palavras-chave: Macrotidal beach; Runup; Storm; Dune; Erosion; Extreme water level.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00639/75097/75610.pdf

Bilan des tempêtes de l’hiver 2013-2014 sur la dynamique de recul du trait de côte en Bretagne
Provedor de dados: 5
Autores: Blaise, Emmanuel; Suanez, Serge; Stephan, Pierre; Fichaut, Bernard; David, Laurence; Cuq, Veronique; Autret, Ronan; Houron, Julien; Rouan, Mathias; Floc'H, France; Ardhuin, Fabrice; Cancouet, Romain; Davidson, Robert; Costa, Stephane; Delacourt, Christophe.
Between December 2013 and March 2014, a cluster of about 12 storm events hit the coast of Brittany with an exceptional frequency. It was in February that these storm events were the most frequent and particularly virulent. The significant wave heights measured off Finistere reached respectively 12.3 m and 12.4 m during Petra and Ulla storms on February 5 and 14. However, analysis of hydrodynamic conditions shows that only three episodes promoted extreme morphogenetic conditions because they were combined with high spring tide level. The first one occurred on January 1 to 4, it was followed by events from February 1 to 3, and March 2-3. During these three extreme events observed tide levels were above highest astronomical tide level (HAT). Maximum surge...
Tipo: Text
Palavras-chave: Tempête; Érosion; Trait de côte; Marée de vive-eau; Bretagne; Surcote; Storm; High spring tide; Surge; Erosion; Shoreline; Brittany.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00310/42171/43029.pdf

Observations and Predictions of Wave Runup, Extreme Water Levels, and Medium-Term Dune Erosion during Storm Conditions
Provedor de dados: 5
Autores: 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

Numerical study of sedimentary impact of a storm on a sand beach simulated by hydrodynamic and sedimentary models
Provedor de dados: 5
Autores: Meule, S; Pinazo, C; Degiovanni, C; Barusseau, Jp; Libes, M.
In marine coastal environments, storms have a major morphological impact on sand beaches. This study, part of the French Programme National d'Environnement Cotier, consisted in developing and applying hydrodynamic and sedimentary models to simulate the major processes that modify sand beaches. In order to study sediment dynamics, we developed three models to simulate waves, currents and sediment transport associated with a storm event. The wave model was a Mild Slope Equation model based on the parabolic approximation of the refraction-diffraction equation of Berkhoff. The hydrodynamic model was obtained by the depth-average of Navier Stockes' equations forced by the terms of radiation stresses induced by waves. The sedimentary model SEDSIM developed by...
Tipo: Text
Palavras-chave: Modification de la plage; Modèles numériques; Transport sédimentaire; Tempête; Courants induits par la houle; Beach modification; Numerical models; Sediment transport; Storm; Wave-induced current.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43339/42887.pdf