title: Spatial patterns in coastal lagoons related to the hydrodynamics of seawater intrusion.
abstract: Marine intrusion was simulated in a choked and in a restricted coastal lagoon by using a 3D-hydrodynamic model. To study the spatiotemporal progression of seawater intrusion and its mixing efficiency with lagoon waters we define Marine Mixed Volume (VMM) as a new hydrodynamic indicator. Spatial patterns in both lagoons were described by studying the time series and maps of VMMtaking into account the meteorological conditions encountered during a water year. The patterns comprised well-mixed zones (WMZ) and physical barrier zones (PBZ) that act as hydrodynamic boundaries. The choked Bages-Sigean lagoon comprises four sub-basins: a PBZ at the inlet, and two WMZ's separated by another PBZ corresponding to a constriction zone. The volumes of the PBZ were 2.1 and 5.4 millions m3with characteristic mixing timescale of 68 and 84days, respectively. The WMZ were 12.3 and 43.3 millions m3with characteristics mixing timescale of 70 and 39days, respectively.
authors.affiliation: Ifremer, UMR MARBEC (IRD, Ifremer, CNRS, Université de Montpellier, CNRS), Av. Jean Monnet, CS F-34203 Sète Cedex, France. Electronic address: annie.fiandrino@ifremer.fr.
authors.forename: Annie
authors.initials: A
authors.lastname: Fiandrino
authors.affiliation: Ifremer, UMR MARBEC (IRD, Ifremer, CNRS, Université de Montpellier, CNRS), Av. Jean Monnet, CS F-34203 Sète Cedex, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Ouisse
authors.affiliation: Service Hydrographique et Océanographique de la Marine, 13, rue du Chatelier, CS 92803, 29228 Brest Cedex 2, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Dumas
authors.affiliation: Ifremer, UMR MARBEC (IRD, Ifremer, CNRS, Université de Montpellier, CNRS), Av. Jean Monnet, CS F-34203 Sète Cedex, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Lagarde
authors.affiliation: Ifremer, UMR MARBEC (IRD, Ifremer, CNRS, Université de Montpellier, CNRS), Av. Jean Monnet, CS F-34203 Sète Cedex, France.
authors.forename: Romain
authors.initials: R
authors.lastname: Pete
authors.affiliation: Ifremer, Laboratoire Environnement Ressources Provence-Azur-Corse, Station de Bastia, Z.I. Furiani, Im. Agostini, 20600 Bastia, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Malet
authors.affiliation: Ifremer, Laboratoire Environnement Ressources de Bretagne Nord, Station de Dinard, CRESCO, 38 rue du Port-Blanc, BP 70134 35801 Dinard Cedex, France.
authors.forename: Sandrine
authors.initials: S
authors.lastname: Le Noc
authors.affiliation: CNRS, UMR MARBEC (IRD, Ifremer, CNRS, Université de Montpellier, CNRS), Place Eugène Bataillon Université de Montpellier, Case 093, F-34095 Montpellier Cedex 5, France.
authors.forename: Rutger
authors.initials: R
authors.lastname: de Wit
mesh_terms: D057446:Hydrodynamics; D012623:Seawater; D014872:Water Movements
keywords: Hydromorphological zonations; Mediterranean coastal lagoons; Mixing efficiency; Numerical model; Transport timescale; Water renewal