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Open AccessArticle

Nature-Based Solution along High-Energy Eroding Sandy Coasts: Preliminary Tests on the Reinstatement of Natural Dynamics in Reprofiled Coastal Dunes

1
University Bordeaux, CNRS, UMR EPOC, 335615 Pessac, France
2
Office National des Forêts, 75012 Paris, France
3
University Rennes, CNRS, IPR (Institut de Physique de Rennes), UMR 6251, 35700 Rennes, France
4
University Rennes, INSA, 35700 Rennes, France
5
University Nantes, CNRS, UMR 6607, 44306 Nantes, France
6
University Paris, Institut de Physique du globe de Paris, CNRS, 75005 Paris, France
*
Author to whom correspondence should be addressed.
Water 2019, 11(12), 2518; https://doi.org/10.3390/w11122518
Received: 28 October 2019 / Revised: 22 November 2019 / Accepted: 25 November 2019 / Published: 28 November 2019
(This article belongs to the Special Issue Nature-Based Solutions for Coastal Engineering and Management)
This paper describes a large-scale experiment designed to examine if reinstating natural processes in the coastal dune systems of Southwest France can be a relevant nature-based adaptation in chronically eroding sectors and a nature-based solution against coastal hazards, by maintaining the coastal dune ecological corridor. An experiment started in late 2017 on a 4-km-long stretch of coast at Truc Vert, where experimental notches were excavated and intensively monitored in the incipient and established foredunes. Preliminary results indicate that most of the excavated notches did not develop into blowout. Only the larger elongated notches subsequently excavated in the established foredune in 2018 showed evidence of development, acting as an effective conduit for aeolian landward transport into the dunes. All notches were found to have a statistically significant impact on vegetation dynamics downwind, even those that did not develop. The area of bare sand landward and within the elongated notches notably increased implying a loss of vegetation cover during this first stage of development. Observations of a nearby coastal dune system that has been in free evolution over the last 40 years also indicate that, although the dune migrated inland by more than 100 m, it is now mostly made of bare sand. Further work is required to explore if and how dunes maintained as dynamic systems can become an efficient nature-based solution along this eroding coastline. View Full-Text
Keywords: coastal dunes; erosion; resilience; vegetation dynamics; blowouts; nature based solution; coastal management; photogrammetry coastal dunes; erosion; resilience; vegetation dynamics; blowouts; nature based solution; coastal management; photogrammetry
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Castelle, B.; Laporte-Fauret, Q.; Marieu, V.; Michalet, R.; Rosebery, D.; Bujan, S.; Lubac, B.; Bernard, J.-B.; Valance, A.; Dupont, P.; Ould El Moctar, A.; Narteau, C. Nature-Based Solution along High-Energy Eroding Sandy Coasts: Preliminary Tests on the Reinstatement of Natural Dynamics in Reprofiled Coastal Dunes. Water 2019, 11, 2518.

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