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Apports d'une observation précoce de la végétation spontanée pionnière pour la renaturation des rives de la rivière Sélune

Abstract : The restoration of ecological continuity along the Sélune River (Normandy, France) involves the removal of two tall hydroelectric dams (36 m and 16 m high), a project without precedent in Europe. In the pre-removal phase, the reservoir’s slow draining (2014–2018) allowed to conduct a showcase engineering project focused on sediment management in order to avoide excessive delivery to the river’s downstream sections. Progressive spontaneous revegetation of Sélune Riverbanks, as sediments were exposed, has been surveyed since 2015 depending on modalities for conducting civil engineering works aiming to stabilize sediments. Lessons from the information gathered can inform the ecological restoration approaches implemented: oA great diversity and a habitat mosaic characterize spontaneous vegetation colonizing an old reservoir (90 years) highlight an opportunity to consider the options of a full and fast revegetation and a sediment stabilization over several dozen hectares. oEcological functions provided by this vegetation reinforce this opportunity oHowever, season of the water level decrease affects patterns of these initial development oMoreover, riverbank profiling works, that where late execute, negatively affect community trajectory oThe relevance of considering preliminary field observations along reservoirs can help limit profiling works, which goes against the advantages obtained after 2,5 years of passive ecological restoration
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Charlotte Ravot, Marianne Laslier, Laurence Hubert-Moy, Simon Dufour, Didier Le Coeur, et al.. Apports d'une observation précoce de la végétation spontanée pionnière pour la renaturation des rives de la rivière Sélune. Sciences Eaux & Territoires , INRAE, 2020, ⟨10.14758/SET-REVUE.2020.HS.02⟩. ⟨hal-02613954⟩

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