Gironde Estuary Mouth MEasurement Stations (GEMMES)

Date 2021
Temporal extent 2016-11 -2017-12
Author(s) Grasso FlorentORCID1, Bocher Alan2, Jacquet MatthiasORCID1, Le Berre DavidORCID1, Lecornu Fabrice1
Affiliation(s) 1 : IFREMER - DYNECO/DHYSED, Centre de Bretagne, CS 10070, F-29280 Plouzané, France
2 : IFREMER - RDT/SIIM, Centre de Bretagne, CS 10070, F-29280 Plouzané, France
DOI 10.17882/78968
Publisher SEANOE
Keyword(s) Gironde Estuary, Bay of Biscay, Hydrodynamics, Sediment dynamics, Turbidity, Current velocity, Continental shelf, Buoy measurement, Benthic mooring
Abstract

In the framework of the ANR AMORAD project, the METEOR cruises (Grasso, 2017) aimed at deploying the ‘Gironde Estuary Mouth MEasurement Stations’ (GEMMES) to measure hydrodynamics and sediment dynamics at the mouth of the Gironde Estuary and on the West Gironde Mud Patch (SW France, Bay of Biscay). Measurements were carried out between November 2016 and December 2017: i) from a buoy station around 20-m water depth (GEMMES-20), collecting sub-surface data of temperature, salinity and turbidity; and ii) a benthic station around 40-m water depth (GEMMES-40), collecting data of current velocity and turbidity. Bottom and surface water samples were regularly collected to calibrate turbidity measurements to SPM concentrations.

Licence CC-BY
Utilisation Ifremer
Acknowledgments This work was done as part of the AMORAD project and received a state fund managed by the Agence Nationale de la Recherche (ANR) under the program Investissements d′avenir (AMORAD‐ANR‐11‐RSNR‐0002). Measurements were carried out in the framework of the METEOR cruises (Grasso, 2017). GRASSO F. (2017). METEOR 2017 cruise, RV Côtes De La Manche, https://doi.org/10.17600/17010200
Sensor metadata

The GEMMES dataset includes measurements collected at two locations (GEMMES-20 and GEMMES-40).

 

1/ GEMMES-20 (N 45.6375; W 1.3917), in front of the Gironde Estuary Mouth:

  • Surface measurements from a buoy station moored around 20-m water depth (CTD Sea-Bird SBE19+, turbidimeter Wetlab FLNTU, 1-m below mean sea level, every 15 minutes), data file ‘GEMMES-20_hydrosed.txt’ with Time, Temperature (°C), Salinity (PSU), Turbidity (NTU) and SPM concentration (g/l).
  • Water samples at the sea surface (1-m below mean sea level) and at the bottom (1-m above bed level), data file ‘Samples_NISKIN_GEMMES-20.txt’ with Time, Water depth (Bottom/Surface) and SPM concentration (g/l).

 

2/ GEMMES-40 (N 45.7167; W 1.5750), on the West Gironde Mud Patch offshore of the Gironde Estuary Mouth:

  • Bottom measurements from a benthic station at around 40-m water depth:
    • data file ‘GEMMES-40_hydrosed.txt’ (turbidimeter Wetlab FLNTU, 1-m above bed level, every 15 minutes) with Time, Turbidity (NTU) and SPM concentration (g/l);
    • data folder ‘GEMMES-40_ADCP’ (ADCP 600 WORKHORSE, 1-m above bed level, every 10 minutes) with vertical profiles (50-cm cells) of Time, 3D current velocities (u, v, w), Water Depth, Backscatter Index, Significant wave height, Wave peak period.
  • Water samples at the sea surface (1-m below mean sea level) and at the bottom (1-m above bed level), data file ‘Samples_NISKIN_GEMMES-40.txt’ with Time, Water depth (Bottom/Surface) and SPM concentration (g/l).

 

Data
File Size Format Processing Access
GEMMES_dataset 25 MB TEXTE Processed data Open access
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How to cite 

Grasso Florent, Bocher Alan, Jacquet Matthias, Le Berre David, Lecornu Fabrice (2021). Gironde Estuary Mouth MEasurement Stations (GEMMES). SEANOE. https://doi.org/10.17882/78968