Esdeveniments

Generation, propagation and dissipation of internal waves in the coastal ocean

15 Abril 2016
12:15
Ubicació: 
Sala d'Actes
Impartida per: 
Dr. Daniel Bourgault
Filiació: 
Institut des Sciences de la Mer, Rimouski, Canadà

Summary

Internal waves are fascinating flow disturbances that are now routinely observed in lakes, oceans and the atmosphere. However, their origin remains elusive as there is only a handful number of known generation mechanisms to guide the interpretation of field measurements, but these alone cannot explain the richness of the observed internal wave field. Their fate is also enigmatic. Where do they go and how do they loose their energy remain outstanding oceanographic questions. Given that internal waves can travel tens and hundreds of kilometers, it is likely that at some point they will interact with the sloping topography, especially in the coastal ocean and semi-enclosed seas, where they can possibly break, as do surface waves on beaches, and interact with the bottom sediment. This talk will provide a few answers to those questions by presenting direct field observations as well as results from idealized numerical simulations of internal wave generation, propagation and dissipation along sloping bottom in the coastal ocean.

 

Brief biography

Dr. Daniel Bourgault, Professeur-chercheur, océanographie physique, Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski. Daniel Bourgault's research focuses on coastal oceanographic processes related to turbulence and internal waves. He is particularly interested in multidisciplinary oceanographic problems in which physical processes impact chemical, biological and geological processes. In that regards he has contributed to the understanding of vertical turbulent nutrient fluxes, coastal hypoxia and sediment resuspension caused by shoaling internal waves.