Simulating the 1999 Capbreton canyon turbidity current with a Cellular Automata model |
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| Authors: | T Salles T Mulder M Gaudin MC Cacas S Lopez P Cirac |
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| Institution: | aCSIRO Petroleum Resources, 26 Dick Perry Avenue, Kensington WA 6151, Australia;bUniversité Bordeaux 1, UMR CNRS 5805 EPOC, av. des Facultés, 33405 Talence Cedex, France;cInstitut Français du Pétrole, Département Géologie-Géochimie-Géophysique, 4 av. de Bois Préau, 92852 Rueil Malmaison Cedex, France |
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| Abstract: | A numerical model has been developed for the simulation of turbidity currents driven by nonuniform, non cohesive sediment and flowing over a complex three dimensional submarine topography. The model is based on an alternative approach known as Cellular Automata paradigm. The model is validated by comparing a simulation with a reported field-scale event. The chosen case is a turbidity current which occurred in Capbreton Canyon and was initiated by a storm in December 1999. Using data from recent oceanographic cruises, the deposit of the event has been precisely described, which constrain values of model parameters. The model simulates the 1999 turbidity current over the actual canyon topography and related turbidite using three different types of particle. The model successfully simulates areas of erosion and deposition in the canyon. It predicts the vertical and longitudinal grain size evolution, and shows that the fining-up sequence can be deposited by several phases of deposition and erosion related to the current energetic variation during its evolution. This result could explain the presence of intrabed contacts or the frequent lack of facies in Bouma sequences. |
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| Keywords: | Turbidity current modeling Capbreton canyon Deposits composition and architecture Cellular Automata |
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