A reduced-complexity shoreline change model combining longshore and cross-shore processes: The LX-Shore model

Arthur Robinet (1) , Déborah Idier (1) , Bruno Castelle (2) , Vincent Marieu (3)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 UB - Université de Bordeaux
3 EPOC - Environnements et Paléoenvironnements OCéaniques

A reduced-complexity numerical model, LX-Shore, is developed to simulate shoreline evolution along wave-dominated sandy coasts. The model can handle any sandy shoreline geometries (e.g. sand spits, islands), including non-erodible areas such as coastal defenses and headlands, and is coupled with a spectral wave model to cope with complex nearshore wave fields. Shoreline change is primarily driven by the gradients in total longshore sediment transport and by the cross-shore transport owing to variability in incident wave energy. Application to academic cases and a real coast highlights the potential of LX-Shore to simulate shoreline change on timescales from hours (storm) to decades with low computational cost. LX-Shore opens new perspectives in terms of knowledge on the primary mechanisms locally driving shoreline change and for ensemble-based simulations of future shoreline evolution.

Mots clés: Numerical model; shoreline change; sandy coasts; cross-shore transport; longshore transport

Domaines: Planète et Univers [physics]; Sciences de l'environnement

Arthur Robinet, Déborah Idier, Bruno Castelle, Vincent Marieu. A reduced-complexity shoreline change model combining longshore and cross-shore processes: The LX-Shore model. Environmental Modelling and Software, 2018, 109, pp.1-16. ⟨10.1016/j.envsoft.2018.08.010⟩. ⟨hal-02734892⟩