Stages of sedimentary infilling in a hypertidal bay using a combination of sedimentological, morphological and dynamic criteria (Bay of Somme, France)

Charlotte Michel (1) , Sophie Le Bot (1) , Flavie Druine (1) , Stéphane Costa (2) , Franck Levoy (1) , Carole Dubrulle-Brunaud (1) , Robert Lafite (1)

1 M2C - Morphodynamique Continentale et Côtière
2 LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554

In the context of rising sea level, many estuaries and bays show an overall trend to sedimentary infilling. Among these coastal environments, the Bay of Somme is a hypertidal tide and wave-dominated estuary, filled in by marine sands, with a superficy of 70 km 2. This study proposes a spatial zonation of the intertidal area of the bay based on the combination of information on sediments, seabed morphology and dynamics. Data come from a surficial sediment sampling campaign and six airborne LiDAR topographic surveys, acquired over the period 2011-2013, providing information on grain size, carbonate content, bedform occurrence and seabed dynamics. The Main Map shows the morpho-sedimentary and-dynamic zonation used as a basis to describe infilling stages in the bay

Mots clés: intertidal; hypertidal estuary; Sedimentary infilling; Bay of Somme; sediment grain-size; sediment dynamics; LiDAR; hydraulic dunes

Domaines: Planète et Univers [physics]; Interfaces continentales, environnement

Charlotte Michel, Sophie Le Bot, Flavie Druine, Stéphane Costa, Franck Levoy, et al.. Stages of sedimentary infilling in a hypertidal bay using a combination of sedimentological, morphological and dynamic criteria (Bay of Somme, France). Journal of Maps, 2017, 13 (2), pp.858-865. ⟨10.1080/17445647.2017.1389663⟩. ⟨hal-02119165⟩