An operational discontinuous Galerkin shallow water model for coastal flood assessment - BRGM - Bureau de recherches géologiques et minières
Journal Articles Ocean Modelling Year : 2024

An operational discontinuous Galerkin shallow water model for coastal flood assessment

D. Lannes
Fabien Marche
Sebastien de Brye
  • Function : Author
Simon Delmas
  • Function : Author
  • PersonId : 974796

Abstract

Hydrodynamic modeling for coastal flooding risk assessment is a highly relevant topic. Many operational tools available for this purpose use numerical techniques and implementation paradigms that reach their limits when confronted with modern requirements in terms of resolution and performances. In this work, we present a novel operational tool for coastal hazards predictions, currently employed by the BRGM agency (the French Geological Survey) to carry out its flooding hazard exposure studies and coastal risk prevention plans on International and French territories. The model, called UHAINA (wave in the Basque language), is based on an arbitrary high-order discontinuous Galerkin discretization of the nonlinear shallow water equations with SSP Runge–Kutta time stepping on unstructured triangular grids. It is built upon the finite element library AeroSol, which provides a modern C++ software architecture and high scalability, making it suitable for HPC applications. The paper provides a detailed development of the mathematical and numerical framework of the model, focusing on two key-ingredients : (i) a pragmatic treatment of the solution in partially dry cells which guarantees efficiently well-balancedness, positivity and mass conservation at any polynomial order; (ii) an artificial viscosity method based on the physical dissipation of the system of equations providing nonlinear stability for non-smooth solutions. A set of numerical validations on academic benchmarks is performed to highlight the efficiency of these approaches. Finally, UHAINA is applied on a real operational case of study, demonstrating very satisfactory results.
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hal-04761792 , version 1 (31-10-2024)

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Andrea Gilberto Filippini, Luca Arpaia, Vincent Perrier, Rodrigo Pedreros, Philippe Bonneton, et al.. An operational discontinuous Galerkin shallow water model for coastal flood assessment. Ocean Modelling, 2024, 192, pp.102447. ⟨10.1016/j.ocemod.2024.102447⟩. ⟨hal-04761792⟩
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