Related Experiment Video
Updated: Mar 5, 2026

Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
Published on: April 18, 2025
Spatial patterns in coastal lagoons related to the hydrodynamics of seawater intrusion
Annie Fiandrino1, Vincent Ouisse1, Franck Dumas2
1Ifremer, UMR MARBEC (IRD, Ifremer, CNRS, Université de Montpellier, CNRS), Av. Jean Monnet, CS F-34203 Sète Cedex, France.
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 VMM taking 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 m3 with characteristic mixing timescale of 68 and 84days, respectively. The WMZ were 12.3 and 43.3 millions m3 with characteristics mixing timescale of 70 and 39days, respectively.
More Related Videos
Related Concept Videos
Effect of Sea Water on Concrete
Concrete in areas between tide marks,...
Distribution and Dispersion
Plane Potential Flows
Uniform...
Aquaporins
Design Example: Measuring Distance Between Two Points with Obstructions
Disorder of Water Balance
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...

