New modelling of submarine gravity flows: application to the Nice collapse in 1979.

Type Article
Date 2001-07
Language English
Author(s) Hugot Alexandre, Joseph Philippe, Savoye Bruno, Zaleski Stéphane
Affiliation(s) Inst Francais Petr, Div Geol Geochim, F-92852 Rueil Malmaison, France.
Inst Francais Rech Exploitat Mer, Lab Environm Sedimentaires, F-29280 Plouzane, France.
Univ Paris 06, Modelisat Mecan Lab, F-75252 Paris, France.
Source Comptes Rendus de l'Academie des Sciences - Series IIA - Earth and Planetary Science (1251-8050) (Elsevier), 2001-07 , Vol. 333 , N. 2 , P. 133-139
DOI 10.1016/S1251-8050(01)01606-8
WOS© Times Cited 2
Keyword(s) France, 1979 Nice airport collapse, Inverse problem, Flow object, Turbidity current, Gravity flow
Abstract We propose to apply in this note a simple mathematical model for the sedimentation of gravity deposits in deep water. An inverse method has been developed in order to characterize the parameters associated with the submarine flow. This method also provides the initial conditions, which constitute a major uncertainty in geoscience modelling. Application of the inverse method to the 1979 Nice air-port collapse (southern France), constrained by cable breaks and/or deposit thicknesses, leads, for example, to the estimation of the initial volume and/or the physical parameters of the flow (friction coefficient, modified turbulent Schmidt number, etc.). The application of the model to this real case shows that only the simultaneous inversion of dynamic (cable break times) and sedimentological (deposit) data allows a satisfactory reconstruction of the flow.
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