Simulation for climate change and indicator of vulnerability on four French sandy beaches

Water Qualit

Simulations morphodynamiques long terme pour la protection du littoral

L'utilisation des barres en mer pour combattre l'érosion des plages, remonte aux années 90, et est basée sur le fait qu'elles représentent un réservoir substantiel de sédiment. De plus, le rôle essentiel que ces barres peuvent jouer dans la réduction de l'énergie des vagues a été démontré par des études récentes. Par conséquent, travailler à renforcer les barres existantes ou même à ajouter des barres supplémentaires est une approche prometteuse, parce qu'elles constituent une ligne de défense et respectent l'environnement. Le premier objectif de cette étude est de montrer que la simulation numérique peut être un outil d'aide à la décision pour définir le meilleur emplacement de rechargement. Le deuxième but de cette étude est de définir une méthodologie pour découper les conditions atmosphériques mesurées sur une saison, un an ou une décennie en un nombre approprié d'événements climatiques pour la simulation

Longshore Sediment Transport Measurements on Sandy Macrotidal Beaches Compared with Sediment Transport Formulae

In a context of global climate change, local sea level rise could affect the different coastal processes as erosion, transport and deposition which are responsible in maintaining the coastline. The study of sediment transport processes is one of the key for a better understanding of the coastal evolution which is needed for effective design of coastal engineering or to protect anthropogenic activities and population from marine submersion. One of the main processes that control coastal evolution is sediment transport. A number of studies have been focused on this topic, but they were mostly restricted to micro- to mesotidal beaches [1-3] and field investigations on sandy macrotidal beaches appear to be more limited, notably because these environments are less common along the worldwide coastline [4]. Only a few studies have been conducted for quantifying sediment flux on macrotidal beaches [5, 6] where sediment transport results from the complex interactions of tidal currents with longshore currents generated by obliquely incident breaking waves, this complexity being further increased by the large variations in water level that induce significant horizontal translations of the surf zone. Although a number of studies were recently conducted on the morphodynamics of the barred macrotidal beaches of Northern France [7-12], relatively little effort has been dedicated to measuring longshore sediment transport on these beaches, even though it is largely recognized that they are affected by significant longshore transport that plays a major role in the morphodynamics of the intertidal zone [10, 13]. Apart from some attempts to make estimates of longshore sediment transport from fluorescent tracers [10, 14-16] and to infer transport directions using grain-size trend analysis techniques..

Comparison of sediment transport formulae during a flood wave in the river: an application of Telemac teaching

Water Qualit

Comparison of sediment transport formulae with simulation of several storms on a Mediterranean beach and with in-situ sedimentary flux on a North Sea beach

Water Qualit

De l'espace au littoral

International audienc

Simulation for climate change and indicator of vulnerability on four French sandy beaches

International audienc

Methodology of seasonal morphological modelisation for nourishment strategies on a Mediterranean beach

International audienceA modified 2DH morphodynamical model was employed to simulate the evolution of large-scale features with major implications for beach nourishment. The study was focused on modelling the evolution of material artificially placed in different parts of the profile, extracting or adding material to the natural bars, and quantifying how the profile responds to different wave climates and nourishment placements. The simulated results were compared with field data from a Mediterranean beach

Long-term simulation with 2DH and 3D models for nourishment on Mediterranean beaches

A modified 2DH morphodynamic and a 3D model was employed to simulate the evolution of large-scale features with major implications for beach nourishment. The study is focused on modeling the evolution of material artificially placed in different parts of the profile, extracting or adding material to the natural bars, and quantifying how the profile responds to different wave climates and nourishment placements. The simulated results were compared with field data from a Mediterranean beach