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Dynamique de l'érosion fluviatile consécutive à une chute du niveau de base. L'exemple de la Crise de Salinité Messinienne

Abstract : Base-level variations involve a perturbation of the erosional dynamics of a continental system. A base-level drop results in the upstream propagation of an incision that rejuvenates the landscape. This work aims to show how this erosional stage will affect the evolution of a landscape, depending on the parameters of the preexisting morphological system. It is based on an example of preserved base-level drop of large amplitude, which occurred during the Mediterranean Messinian Salinity Crisis, 5.5 Ma ago. Morphological analysis combined with a numerical modeling show that there is a divergence between the network growth and its effects on the long-term evolution of a landscape due to the occurrence of a regional slope line. The absence of a regional slope line can result in a major change such as the capture of the Atlantic waters in the Gibraltar Strait area, inducing the end of the Messinian Salinity Crisis.
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https://tel.archives-ouvertes.fr/tel-00011641
Contributor : Isabelle Dubigeon <>
Submitted on : Friday, February 17, 2006 - 4:48:56 PM
Last modification on : Thursday, January 14, 2021 - 11:38:24 AM
Long-term archiving on: : Saturday, April 3, 2010 - 8:12:34 PM

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  • HAL Id : tel-00011641, version 1

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Nicolas Loget. Dynamique de l'érosion fluviatile consécutive à une chute du niveau de base. L'exemple de la Crise de Salinité Messinienne. Géomorphologie. Université Rennes 1, 2005. Français. ⟨tel-00011641⟩

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