The morpho-sedimentology of an artificial roadstead (Cherbourg, France)

Type Article
Date 2019-07
Language English
Author(s) Gregoire G.1, 2, Méar Y.1, 2, Poizot E.1, 2, Marion C.1, 2, Murat A.1, 2, Hebert B.3
Affiliation(s) 1 : Conservatoire National des Arts et Métiers, Intechmer, Cherbourg-en-Cotentin, France
2 : Laboratoire Universitaire des Sciences Appliquées de Cherbourg, Normandie Université, Unicaen, LUSAC, Cherbourg-en-Cotentin, France
3 : Cefrem, Université de Perpignan, Perpignan, France
Source Journal Of Maps (1744-5647) (Informa UK Limited), 2019-07 , Vol. 15 , N. 2 , P. 677-685
DOI 10.1080/17445647.2019.1642247
WOS© Times Cited 1
Keyword(s) Morphology, sedimentology, morphodynamic, granulometry, bathymetry, Cherbourg roadstead

Because of its size and geographical position, the Cherbourg roadstead appears as a favourable site for Marine Renewable Energy (MRE) industry. As a result, Cherbourg harbour has undergone profound changes (2015 and 2016) due to the installation of industrial infrastructures to service the needs of expanding MRE further offshore. However, little is known about the morpho-sedimentary distribution and associated dynamics of seabed sediments before and after harbour transformations. This study focuses on sedimentary dynamics using detailed morphological and sedimentological analyses based on data acquired before changes (2012). The main map includes a unique bathymetric map (1:35,000) and sedimentary maps showing the percentage of the characteristic grain size fractions of 184 seabed samples. Despite the high tidal conditions, the roadstead construction had a significant impact on the sedimentary facies and distribution. This study provides a basis for future investigations on geomorphological evolution linked to the impact of anthropogenic development.

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