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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Realignment Strategy in the Rhone Delta: Consequences for Geomorphological Dynamics in a Context of Climate Change
Auteurs :	Cecile Puigserver, Auteur ; Francois Sabatier, Auteur ; Philippe Larroude, Auteur ; Olivier Boutron, Auteur
Type de document :	Chapitre
Editeur :	[S.l.] : World Scientific, 2023
Format :	2293-2306
Langues:	Anglais
Mots-clés :	TdV ; Camargue ; salin ; Modèle ; tempête ; Digue ; Zone littorale ; Erosion
Résumé :	The Former Saltworks, located in the south-eastern part of the Rhone delta with an area of about 6500 ha was acquired by French State between 2008 and 2012. A large-scale realignment strategy has been implemented: the sea-dikes protection of the former salt production site is no longer maintained. This induced since 2008 a complex geomorphological dynamic. In this paper we aim to qualitatively estimate the specific contribution of storms on the dynamics of the site’s connections with the sea and of the beaches areas. A statistical analysis allowed us to identify the occurrence of storms in this area based on data from the ERA5 model. Two calibrated and validated models were used (TOMAWAC and XBeach) to understand the geomorphological evolution due to the storm of the site after this strategic realignment. The results for the simulations show a predominance for erosion and channel creation. However, these results must be qualified because the unmaintained dike, composed of rocks and pieces of geotextile torn and scattered in a non-uniform manner, is represented in the modelling approach as being entirely composed of sand. This site with riprap presents an exceptional opportunity to observe a. The results of the shoreline leave-behind operation at this site with riprap has implications for re-naturalization in terms of ecological, economic and political interests
En ligne :	https://www.worldscientific.com/doi/10.1142/9789811275135_0211
contenu dans :	Coastal Sediments 2023

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