An Unstructured Numerical Model to Study Wind-Driven Circulation Patterns in a Managed Coastal Mediterranean Wetland: The Vaccares Lagoon System
|Author(s)||Boutron Olivier1, Bertrand Olivier2, Fiandrino Annie3, Hoehener Patrick4, Sandoz Alain1, 5, Cherain Yves6, Coulet Eric6, Chauvelon Philippe1|
|Affiliation(s)||1 : Fondat Tour Valat, Ctr Rech Conservat Zones Humides Mediterraneennes, F-13200 Arles, France.
2 : ARTELIA, F-38130 Echirolles, France.
3 : IFREMER, F-34203 Sete, France.
4 : Univ Aix Marseille, Lab Chim Environm, F-13331 Marseille 3, France.
5 : Univ Aix Marseille, UFR Sci, F-13331 Marseille 3, France.
6 : SNPN, Ctr Informat Reserve Natl Camargue, F-13200 Arles, France.
|Source||Water (2073-4441) (Mdpi Ag), 2015-11 , Vol. 7 , N. 11 , P. 5986-6016|
|WOS© Times Cited||12|
|Keyword(s)||coastal lagoon, mathematical model, hydrodynamics, calibration, validation, wind-driven circulation|
|Abstract||The spatiotemporal structure of wind-driven circulation patterns and associated water exchanges can drive important bio-hydrodynamic interactions in shallow lagoons. The Vaccares lagoon system is a complex shallow hydrosystem located in the central part of the Rhone Delta (France). It is internationally recognized as part of a biosphere reserve within the framework of UNESCO's Man and Biosphere Programme, and as a RAMSAR site. Due to its frequent occurrence in this area, and considering the shallowness of the Vaccares lagoon system, wind is assumed to play a major role in the hydrodynamic and biological processes. In this study, a hydrodynamic model was developed to investigate the structure of wind-driven circulations in the Vaccares lagoon system, to provide insights into their role in transport and water exchange processes. The implementation and assessment (calibration and validation) of the model is presented first. Simulations were then performed for two typical steady wind conditions and for one measured unsteady wind event. The results illustrate the influence of the complex geometry of the Vaccares lagoon system on the wind-driven circulations, and the differences observed between the different sub-lagoons in this system. The differences in wind-induced water exchanges between these sub-lagoons are also discussed.|