Modelling and simulation of coastal lagoons

Céline Acary-Robert (1) , Loïc Dagnas (2) , Antoine Rousseau (3, 4)

1 LAMA - Laboratoire de Mathématiques
2 Inria Chile
3 IMAG - Institut Montpelliérain Alexander Grothendieck
4 LEMON - Littoral, Environment: MOdels and Numerics

The objective of this work is to provide a numerical model for the hydrodynamics of a lagoon located on the chilean coastline, characterized by an intermittent connection to the sea and a regular fresh water input coming from the Andes mountains. The model consists in a two-dimensional nonlinear shallow water system, including tracer equations for the time evolution of temperature and salinity. The water circulation in the lagoon accounts for external forcings such as water exchanges (with the atmosphere, rivers and sea), wind effects and external pumping. The paper includes a validation of the numerical method with respect to an analytical solution; numerical illustrations of involved geophysical processes and realistic simulation of typical scenarios of the Tunquén lagoon are provided. Software availability. The software sources will be made available for download on a free accessible repository .

Mots clés: Hydrodynamic modeling; Shallow water model; Finite volumes; Temperature and salinity simulations; Tunquen lagoon

Domaines: Modélisation et simulation

Céline Acary-Robert, Loïc Dagnas, Antoine Rousseau. Modelling and simulation of coastal lagoons: Application to the Tunquén lagoon, Chilean pacific coast.. 2016. ⟨hal-01921054v1⟩