Multi-scale morphodynamics of sand barrier driven by Monsoon/typhoon conditions - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2014

Multi-scale morphodynamics of sand barrier driven by Monsoon/typhoon conditions

Résumé

Island barriers are common features along the world coastlines. They have a crucial role in protecting inland and rich lagoonal ecosystems. Erosion and sand transfers on these island barriers during extreme events such as tropical storms or typhoons remain poorly investigated. This work focuses on a multi-scales nalysis (season to decade) of the morphodynamics of Wan-Tzu-Liao sand barrier subjected to extreme waves and sea surges. We combine topographic measurements of the emerged beach at seasonal scale between 2011 to 2012 and long-term (1993-2009) shoreline changes using aerial photographs and satellite images. At the seasonal scale, during Monsoon, the sand was taken from the beach-front and transported seaward outside the study area. During typhoons season, 12 typhoons drove a beach recovery process resulting in a seaward shoreline shift. This annual behavior is discussed in term of roll-over process of the barrier. At the decadal scale, the shoreline changes evidence cross-shore processes in the north part of the barrier and longshore processes in the south. Although the chronic landward migration displays several stages, the strong losses of the barrier area occurs only since 2004 and call into question the general concept of conservation of mass during the roll-over of a barrier.
Fichier non déposé

Dates et versions

hal-01018203 , version 1 (03-07-2014)

Identifiants

  • HAL Id : hal-01018203 , version 1

Citer

Lucie Campmas, François Sabatier, Samuel Meulé, Jying Li Liou, Lise Petitjean, et al.. Multi-scale morphodynamics of sand barrier driven by Monsoon/typhoon conditions. XIIIème Journées Nationales Génie CIvil Génie Côtier, Jul 2014, Dunkerque, France. pp.xx-xx. ⟨hal-01018203⟩
460 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More