Impact de l'élévation du niveau marin sur l'évolution future d'un cordon littoral lagunaire : une méthode d'évaluation. : Exemple des étangs de Vic et de Pierre-Blanche (littoral méditerranéen, France)

Abstract : Assuming a 22 cm sea level rise by 2050, a map was elaborated, which shows the expected changes which probably will affect the barrier-lagoon system in the Vic and Pierre-Blanche area. The research was supported by the French Conservatoire du littoral and the Procter and Gamble Foundation. According to the linear regression method and using aerial photographs dating back to 1937, the shoreline position in 2050 was predicted. The barrier surface loss due to a 22 cm elevation of the lagoon water level was calculated using a SIG software and accurate topographic data supplied by a GPS survey with sub-centimetric precision. As a result, it is forecasted -within the limits inherent to the methods which were used- that a landward migration of the shoreline over a distance up to 70 m will occur by 2050 as well as a loss of the barrier surface of about 15,76 hectares. Such an evolution which started several centuries ago is likely to be enhanced by the expected sea level rise. The present continuous barrier probably would be transformed in a string of islands through inlet opening.
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Submitted on : Friday, January 30, 2009 - 9:24:32 PM
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Paul Durand, Hugues Heurtefeux. Impact de l'élévation du niveau marin sur l'évolution future d'un cordon littoral lagunaire : une méthode d'évaluation. : Exemple des étangs de Vic et de Pierre-Blanche (littoral méditerranéen, France). Annales de Géomorphologie / Annals of Geomorphology / Zeitschrift für Geomorphologie, Schweizerbart und Borntraeger, 2006, pp.221-244. ⟨hal-00357624⟩

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