Tidal and residual circulations in coupled restricted and leaky lagoons |
| |
| Authors: | Thomas Guyondet Vladimir G Koutitonsky |
| |
| Institution: | Institut des Sciences de la Mer de Rimouski (ISMER), Université du Québec à Rimouski, 310 Allée des Ursulines, Rimouski, QC G5L 3A1, Canada |
| |
| Abstract: | Finite element numerical modelling based on field data is used to study the tidal and tidally induced residual circulation dynamics of a coupled “restricted” and “leaky” coastal lagoon system located in the Magdalen Islands, Gulf of Saint-Lawrence. Havre-aux-Maisons Lagoon (HML) is of a “restricted” nature with a neutral inlet in terms of tidal asymmetry. Grande-Entrée Lagoon (GEL) is of a “leaky” nature with a marked ebb dominance at the inlet due to direct interactions between the main astronomical tidal constituents. The imbalance caused by the different tidal filtering characteristics of both inlets combines with the internal morphological asymmetries of the system to produce a residual throughflow from HML to GEL. The residual circulation is also characterized by strongest values at both inlets, very weak residual currents in HML deep basin and a dipole of residual eddies over the deeper areas of GEL. Further investigations including numerical tracer experiments will be necessary to achieve a full understanding of the long term circulation of this lagoonal system. |
| |
| Keywords: | coastal lagoons hydrodynamics residual flow inlet morphology tidal asymmetry Canada Gulf of Saint-Lawrence Magdalen Islands 47° 30&prime N 61° 40&prime W |
| 本文献已被 ScienceDirect 等数据库收录！ |
