Le Havre-Plage

21.5°C Water temp · Jul 22

France Coastal 1 - Excellent 21.5°C

Satellite image of LE HAVRE-PLAGE — Satellite image © Esri

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Water

Coastal waters of the English Channel (Baie de Seine) and the Seine estuary. The study area includes a 3D hydrodynamic model covering the Seine estuary and surrounding coastal zones with varying bathymetry and tidal conditions.

Location

Three bathing beaches are studied: Saint-Jouin-Bruneval, Sainte-Adresse, and Le Havre, located along the coast between Le Havre and Saint-Jouin-Bruneval in France.

Water Quality

Water quality assessment focuses on E. coli contamination levels measured in colony-forming units per 100 millilitres (CFU/100ml). Threshold exceedances at 500 CFU/100ml and 1000 CFU/100ml are monitored. Bacterial decay modelling uses T90 values of 20, 30, and 40 hours. Background E. coli levels are measured and modelled.

Risks

Contamination from wastewater discharges and combined sewer overflows during dry weather and rainfall events. E. coli pollution is dispersed through hydrodynamic processes including tidal currents, river flow, and meteorological conditions. Discharge points along the Seine and coastal outfalls represent identified pollution sources.