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Les levées de tête du Marais poitevin - Voyage sur des digues vivantes

Authors: Pernet, Alexis; Frileux, Pauline; Morera, Raphaël; Goeldner-Gianella, Lydie; Bouju, Héloïse; Gabillard, Simon;

Les levées de tête du Marais poitevin - Voyage sur des digues vivantes

Abstract

L'exposition "Les levées de tête du Marais poitevin - Voyage sur des digues vivantes" a été conçue comme un livrable dans le cadre du projet de recherche ANR DIGUES (2019-2023). Elle présente les résultats issus d'une analyse du paysage, d'une enquête ethnoécologique, d'une enquête sur la perception des risques, d'une enquête historique et enfin d'une prospective déclinée en trois scénarios d'évolution du système d'endiguement, entre maintien, ouverture et renforcement des digues. Le terrain d'étude concerne un ensemble de digues fluviales à l'amont des secteurs poldérisés du Marais poitevin (Vendée, Charente-Maritime (France)). Ces digues, érigées à partir du 17e siècle, comportent la particularité d'avoir été volontairement boisées (majoritairement en frêne, arbre de production de bois de chauffe) et rendues habitables (pour la surveillance et la maintenance). A l'heure de la Chalarose du frêne, pathologie qui affecte les peuplements de frênes en Europe, et de l'incertitude quant aux impacts du changement climatique sur la zone humide, à la fois proche du littoral et soumise aux crues du bassin versant de la Sèvre niortaise, cette recherche témoigne de la diversité des usages qui affectent ces digues, ainsi que leur caractère hybride, à la fois objets artificiels, patrimoine et milieu vivants. Cette recherche à la fois rétrospective et prospective offre aux populations locales et aux décideurs un support pour préparer le territoire à des ruptures (ouverture ou renforcement de digues) tout en préservant la multifonctionnalité des espaces et des paysages.

The exhibition "Les levées de tête du Marais poitevin - Voyage sur des digues vivantes" was conceived as a deliverable in the framework of the ANR DIGUES research project (2019-2023). It presents the results of a landscape analysis, an ethnoecological survey, a survey of risk perception, a historical survey and, finally, a prospective study based on three scenarios for the evolution of the dike system, between maintaining, opening up and reinforcing the dikes. The study area concerns a set of river dikes upstream of the polderized sectors of the Marais Poitevin (Vendée, Charente-Maritime (France)). These dykes, erected from the 17th century onwards, have the particularity of having been deliberately wooded (mainly with ash, a tree used to produce firewood) and made habitable (for surveillance and maintenance). At a time when Chalara fraxinea, a pathology affecting ash populations in Europe, is on the rise, and the impact of climate change on the wetlands, which are both close to the coast and subject to flooding in the Sèvre Niortaise watershed, is uncertain, this research bears witness to the diversity of uses that affect these dykes, as well as their hybrid character as artificial objects, heritage and living environment. This research, which is both retrospective and prospective, offers local populations and decision-makers a basis for preparing the territory for disruptions (opening or reinforcing dykes) while preserving the multifunctionality of spaces and landscapes.

Keywords

climate change, ethnoecology, mediation, Marais poitevin, landscape, prospective, dykes

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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