GAMAR real ocean hydrodynamic hindcast 2001-2023 (WP3 RiOMAR)

Funded by the Priority Research Programme “Ocean & Climate”, the RiOMar project is studying how the coastal environment is changing under the influence of rivers in the 21st century. It is focusing on five coastal zones in metropolitan France: the English Channel–Seine, Southern Brittany–Loire, Pertuis–Charente, Bay of Biscay–Gironde, and the Gulf of Lion–Rhône. The project aims to answer two important questions: what will happen to vulnerable ocean environments at river mouths due to human activity and climate pressures in the 21^(st) century, and how can we work with environmental managers to improve the condition and functioning of ecosystems using science.

CROCO / GAMAR “real ocean”

• Domain : 43.3°N - 50.9°N / 8°W - 1.7°E
• Horizontal resolution : 1km
• Grid size : 727 x 838 x 40
• Vertical coordinates : Generalized sigma coordinates
• Rivers : 23
• Simulated period : 2000-2023
• River runoff data : Observations from: - French hydrology database (http ://www.hydro.eaufrance.fr) - Emodnet Physics (https://emodnet.ec.europa.eu/) - Gipuzkoako Foru Aldundia (https://www.gipuzkoa.eus/en/web/obrahidraulikoak/hidrologia-eta-kalitatea/aforaleku-iraunkorren-sarea). - In Situ Thematic Centre from Copernicus Marine Service (https://marine.copernicus.eu/about/producers/insitu-tac)
• Tidal forcing : FES2014 - Lyard et al., 2021
• Open Boundary conditions (West and North) : Global Reanalysis GLORYS12V1 (CMEMS, 2024)
• Atmospheric forcings : ERA5 reanalysis (Hersbach et al., 2020)
• Initial condition : Atlantic-Iberian Biscay Irish- Ocean Physics Reanalysis (IBI_MULTIYEAR_PHY_005_002) - https://data.marine.copernicus.eu/product/IBI_MULTIYEAR_PHY_005_002/description?pk_vid=e9cba7958a7b645c1777560067f5af48

This work was supported by the PPR-RiOMar project, a French government grant managed by the Agence Nationale de la Recherche under the France 2030 program, reference ANR 22 POCE 0006.