The impact of Cyclone Nargis on the Ayeyarwady (Irrawaddy) River delta shoreline and nearshore zone (Myanmar): Towards degraded delta resilience? - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Comptes Rendus Géoscience Année : 2017

The impact of Cyclone Nargis on the Ayeyarwady (Irrawaddy) River delta shoreline and nearshore zone (Myanmar): Towards degraded delta resilience?

Résumé

The Ayeyarwady River delta (Myanmar) is exposed to tropical cyclones, of which the most devastating has been cyclone Nargis (2-4 May 2008). We analysed waves, flooded area, nearshore suspended sediments, and shoreline change from satellite images. Suspended sediment concentrations up to 40% above average during the cyclone may reflect fluvial mud supply following heavy rainfall and wave reworking of shoreface mud. Massive recession of the high-water line resulted from backshore flooding by cyclone surge. The shoreline showed a mean retreat of 47 m following Nargis. Erosion was stronger afterwards (-148 m between August 2008 and April 2010), largely exceeding rates prior to Nargis (2000-2005: -2.14 m/year) and over 41 years (1974-2015: -0.62 m/year). This implies that resilience was weak following cyclone impact. Consequently, the increasingly more populous Ayeyarwady delta, rendered more and more vulnerable by decreasing fluvial sediment supply, could, potentially, become more severely impacted by future high-energy events.
Fichier principal
Vignette du fichier
1-s2.0-S1631071317301074-main(1).pdf (3.77 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01765609 , version 1 (13-04-2018)

Identifiants

Citer

Manon Besset, Edward J. Anthony, Philippe Dussouillez, Marc Goichot. The impact of Cyclone Nargis on the Ayeyarwady (Irrawaddy) River delta shoreline and nearshore zone (Myanmar): Towards degraded delta resilience?. Comptes Rendus Géoscience, 2017, 349 (6-7), pp.238-247. ⟨10.1016/j.crte.2017.09.002⟩. ⟨hal-01765609⟩
257 Consultations
231 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More