Gironde Estuary Mouth MEasurement Stations (GEMMES)

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.

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.

Disciplines

Environment, Physical oceanography

Keywords

Gironde Estuary, Bay of Biscay, Hydrodynamics, Sediment dynamics, Turbidity, Current velocity, Continental shelf, Buoy measurement, Benthic mooring

Location

45.72N, 45.63S, -1.39E, -1.58W

Devices

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

FileSizeFormatProcessingAccess
GEMMES_dataset
25 MoTEXTProcessed data
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

Copy this text