Summary
In this paper, we study a multi-lithology diffusion model used to simulate the evolution through time of a sedimentary basin composed of several lithologies such as sand or shale. It is a simplified model for which the surficial flux in lithology i is taken proportional to the slope and to a lithology fraction c s i in lithology i at the top of the basin with a unitary diffusion coefficient. Thus, the sediment thickness variable satisfies a linear parabolic problem and decouples from the other unknowns. The remaining equations couple, for each lithology, a first order linear equation for the surface concentration c s i with a linear advection equation for the basin concentration, for which c s i appears as an input boundary condition at the top of the basin in case of sedimentation. The existence and uniqueness of a weak solution in L ∞ is proved for this problem.
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References
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Eymard, R., Gallouët, T., Gervais, V., Masson, R. (2004). Existence and Uniqueness of a Weak Solution to a Stratigraphic Model. In: Feistauer, M., Dolejší, V., Knobloch, P., Najzar, K. (eds) Numerical Mathematics and Advanced Applications. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18775-9_25
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DOI: https://doi.org/10.1007/978-3-642-18775-9_25
Publisher Name: Springer, Berlin, Heidelberg
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