La déformation gravitaire des côtes à falaises sédimentaires : Modélisations numériques et expérimentales du secteur côtier Le Havre - Antifer (Haute-Normandie)
Identifieur interne : 000738 ( France/Analysis ); précédent : 000737; suivant : 000739La déformation gravitaire des côtes à falaises sédimentaires : Modélisations numériques et expérimentales du secteur côtier Le Havre - Antifer (Haute-Normandie)
Auteurs : Jérôme Le Cossec [France]Source :
Descripteurs français
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Abstract
This study focuses on the effect of clay and sand layers on the gravity instabilities affecting the coastal chalk cliffs located along the French eastern English Channel coastline. The impact of these potential detachment layers is investigated using finite element numeric simulations and experimental modelling under conditions of pore-fluid overpressure. Results indicate that the cliff sliding ratio is linked to the clays layers position with regard to cliff base. The cliff instability is characterized by horizontal seaward sliding guided by the Kimmeridgian clays at the base of the cliff or by the Albian Gault clays at a variable elevation in the cliff. The gravitational deformation is associated with a normal fault network in the chalk and with an inland propagation as a function of the clays layer elevation. Moreover, the clay layer stops the downward propagation of the deformation and acts as a decoupling layer.
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Hal:tel-00531742Le document en format XML
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The impact of these potential detachment layers is investigated using finite element numeric simulations and experimental modelling under conditions of pore-fluid overpressure. Results indicate that the cliff sliding ratio is linked to the clays layers position with regard to cliff base. The cliff instability is characterized by horizontal seaward sliding guided by the Kimmeridgian clays at the base of the cliff or by the Albian Gault clays at a variable elevation in the cliff. The gravitational deformation is associated with a normal fault network in the chalk and with an inland propagation as a function of the clays layer elevation. 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