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LINKING CONTINENTAL EROSION AND MARINE MULTI-LITHOLOGY COUPLING TRANSPORT AND DEPOSITION: AN APPLICATION TO THE OGOOUÉ DELTA, GABON

Abstract : Limited attention has been given to linking continental erosion to marine transport and sedimentation in large-scale landscape evolution models. Although either of the two environments has been thoroughly investigated, the details of how erosional events are recorded in the sedimentary and stratigraphic records have not been studied in a consistent quantitative manner. Here we present results obtained from a new numerical model for marine multi-lithology (sand and silt) coupling transport and deposition that is directly coupled to FastScape, a landscape evolution model that solves the continental stream power law and hillslope diffusion equation using fully implicit and O(n) algorithms. The model of marine multi-lithology coupling transport and deposition is simulated by a nonlinear 2D diffusion model where a source term represents mass flux arising from continental river erosion. We are trying to develop a Bayesian inversion and optimisation scheme with synthetic data to validate the model. The efficient model will then be used to undertake an inversion of stratigraphic data on a natural example, Ogooué Delta, Gabon, by performing a large number of simulations. By comparing cross-section of that delta and sand and silt fraction through depth, the transport coefficients of sand and silt in the ocean environment and variations in sea level are hopefully obtained. Using our model, we will not only show the manner in which the stratigraphic record of the Ogooué Delta responds to tectonic and climate events on adjacent continents but also shows how it is controlled by the coefficients for continental river erosion, and better constrains the nature and timing of erosional events
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https://hal-insu.archives-ouvertes.fr/insu-01718247
Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, February 27, 2018 - 11:23:52 AM
Last modification on : Monday, June 22, 2020 - 7:54:04 AM

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  • HAL Id : insu-01718247, version 1

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Yuan Xiaoping, Jean Braun, Laure Guerit, Brendan Simon. LINKING CONTINENTAL EROSION AND MARINE MULTI-LITHOLOGY COUPLING TRANSPORT AND DEPOSITION: AN APPLICATION TO THE OGOOUÉ DELTA, GABON. International Meeting of Sedimentology 2017, Oct 2017, Toulouse, France. pp.1003. ⟨insu-01718247⟩

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