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Évolution du niveau marin relatif à l'Holocène le long des côtes françaises de l'Atlantique et de la Manche : réactualisation des données par la méthode des "sea-level index points"

Pierre Stéphan 1 Jérôme Goslin 1
1 LETG - Brest - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : This study aims to produce a relative sea-level database for the English Channel and Atlantic coasts of France. Data collected from 54 research papers were reassessed by using SLIP methodology in order to propose a reliable reconstruction of Holocene relative sea-level rise. From 451 radiocarbon-dated sediment records, 264 index points were produced covering the last 11,000 years. The database is subdivided into nine regions along the coast. The post-glacial relative sea-level rise shows: (i) a decreasing of the rates of change over the time especially from 7-6,000 cal. yr BP; (ii) the linear rates of relative sea-level rise did not exceed 1 mm/yr from 7-6,000 cal. yr BP to present; (iii) the relative sea-level has never risen above present (0 m); (iv) no significant sea-level oscillations during the Holocene. Despite the high number of sea-level records available, the number of reliable data is still low and limits the quantification of isostatic trends. Nevertheless, the database should prove to be a valuable resource to researchers working on coasts of mesotidal to macrotidal environments of France and Atlantic Europe.
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Pierre Stéphan, Jérôme Goslin. Évolution du niveau marin relatif à l'Holocène le long des côtes françaises de l'Atlantique et de la Manche : réactualisation des données par la méthode des "sea-level index points". Quaternaire, AFEQ-CNF INQUA, 2014, 25 (4), pp.295-312. ⟨10.4000/quaternaire.7269⟩. ⟨hal-01148328⟩

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