Metocean Research at Ifremer

Hydrodynamics & Metocean
RDT/HO
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Brest
Boulogne/Mer
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Hydrodynamics & Metocean
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Hydrodynamics
www.ifremer.fr
Ocean engineering basin in Brest
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Water circulation tank in Boulogne sur Mer
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Hydrodynamics
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Water circulation tank in Boulogne sur Mer
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Hydrodynamics
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Ocean engineering basin in Brest
Wedge type generator
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Porous damping beach
50m
0
10m
20m
12,5m
0.8  T  3s
H  55cm
H s  30cm
Sea water
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Hydrodynamics
Publications :
Barge pour environnement Brésil : essais en bassin
M. LE BOULLUEC, C. MAISONDIEU, Du PLESSIX G., CORDEAU C.
Actes 10ème Journées de l'Hydrodynamique, Nantes, Mars 2005
Well head production floater : Experimental and numerical investigation
M. LE BOULLUEC, C. MAISONDIEU, Du PLESSIX G., CORDEAU C.
Proc. OMAE 2005, Halkidiki, Grèce, Juin 2005
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Well Head Production Floater WHPF ®
Moon Pool
Run up
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Hydrodynamics
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Well Head Production Floater WHPF ®
Head seas
Diffraction & Radiation
AQUA+
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Free surface elevation
measurements
at 24 locations
Quartering seas
Beam seas
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Metocean
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Metocean
9
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Metocean
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Metocean
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www.ifremer.fr
Metocean
W est
A frica
S well
P roject
Characterization of swell spectra in West Africa
-> statistics of non-linear roll movements
-> statistics of low frequency behavior (QTF)
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Design of FPSO
FPSO (Floating Production Storage & Offloading)
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Metocean
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Sea States description
Advanced Multimodal parametric representation of complex sea-states :
Complex sea-states consist in superimposition of at least 2 wave systems
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(wind-sea+swell, 2 or more swells…)
S(f,)
in
i1
 F  Hsi,Tpi, i, i 
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lfremer
www.ifremer.fr
Sea States partitioning
Development of tools for sea-states partitioning.
After the partitioning process, a sea-state can be described as a summation of
spectral functions characterised by quintuplets of parameters :
S(f,)
i n
i 1
 F  Hsi,Tpi, i, i, i 
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Sea States description
lfremer
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Multi-modal parametric representation
S(f,)
in
i1 F  Hsi,Tpi, i, i 
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Sea States description
Major outputs :
-Parametric representation of each wave system (synthetic database)
-Statistics of wave systems (Climatologies)
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-Wind-sea/swell systems identification (Sea-states classification)
Directional Spreading
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Wave Power Harnessing
SEAREV
Wave energy Converter
Point Absorber type
Annual mean produced power
Captured wave power
 Ph ([fpi, Hsi, i, i, i] )  Ph ([fp, Hs, , , ] )
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Standard Fatigue Design Procedure :
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Usual (H, T, θ ) is no longer sufficient
We cannot avoid moving to a wave systems database:
H1,T1,1, H2,T2,2, H3,T3,3, joint probability of occurrence
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Sea States Time Evolution
Wind-sea events
Statistic description of
events
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Time tracking of Swell &
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Spatiotemporal coherence of Wave Systems from
multi-system analysis :
 Extraction of WS in several sea points (available dir. spectra)
at each time step using partitionning process
 Time tracking of identified structures
>> Algorithm for the automatic space and time tracking of WS
(illustration in the Bay of Biscay, 9 points)
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 WS grouping into homogeneous SW and W-S structures
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Spatiotemporal coherence of Wave Systems from
multi-system analysis :
Space-coherent
structures
Time-coherent spatial
structures
Vector field
representation
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Multi-variable Co-variogram
 the space-coherence
decreases with inter-distance
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Drift Forecast Model
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Quality of environmental forecast data
FORECAST
HF Radar
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PREVIMER
French coastal operational forecasting system
Objectives
• PREVIMER provides coastal synoptic observations and 4 to 6 day forecast
in regional areas (the English Channel, the Bay of Biscay and NW
Mediterranean) down to very local areas on the following parameters:
– direction and intensity of currents,
– sea-surface and bottom temperature,
– sea level and storm surge,
– waves: frequency, direction and height,
– salinity,
– nutrients and phytoplankton concentration,
– water quality…
• 2006-2007 : phase 1 based on demonstrators
• 2008-2012 : phase 2 toward an operational system
www.previmer.org
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PREVIMER
French coastal operational forecasting system
Spatial data
SST, Ocean colour
Reference data
Bathymetry (SHOM, IFREMER), coastline
PREVIMER Models
www.ifremer.fr
7 models, 1 run per day
1 waves model, 2 runs per day
CDOCO
Monitoring of the system
Model results = NetCDF files
(24 Gigabytes per day)
Delayed mode
Forcing data
River flow, rainfall and
evapotranspiration, atmospheric data,
model results (MERCATOR, WW3,…),
climatologies
Real time
Quality checks
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PREVIMER Web site
Forecasts on currents, waves, sea
level, temperature and salinity on the
French coastline at different scales.
In situ data
Vessel data (CTD,TSG, ADCP, …)
T,S (Recopesca, island Network)
Tide Gauge (SHOM)
Swell buoys (CETMEF, Météo-France)
Turbidity buoy (MOLIT)
Marel Buoys (Roslit, Gironde)
Radars (VIGICOTE)
Archive RDBMS + hard disk
Data users
Access through FTP,
OpenDap, Thredds, http
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PREVIMER
French coastal operational forecasting system
lfremer
www.ifremer.fr
Better Wave forecast with current forcing
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lfremer
www.ifremer.fr
Ocean Space Laboratory
CERSAT (Centre ERS d'Archivage et de Traitement French ERS Processing and Archiving Facility) is part of
IFREMER.
It was created in 1991 as a node of the ESA (European
Space Agency) ground segment for the ERS-1 and ERS-2
Earth observation satellites, performing off-line processing of
the ERS-1 and ERS-2 "low-bit rate" sensors.
CERSAT has then evolved towards a multi-mission data
centre for archiving, processing and validating data from
spaceborne sensors (such as altimeters, scatterometers,
radiometers, SAR,...).
It is intended for the oceanographic community, making
available homogeneous time series of value-added data
relevant to the sea surface state (wind fields, fluxes, waves
or sea-ice).
Pierre
Queffeulou
http://www.ifremer.fr/cersat/en/welcome.htm
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Ocean Space Laboratory
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www.ifremer.fr
GlobWave
The ESA GlobWave project is a three year initiative
funded by the European Space Agency (and subsidised
by CNES) to service the needs of satellite wave product
users across the globe.
The project will provide free access to satellite wave
data and products in a common format, both historical
and in near real time from various European and
American satellites.
The project aims to stimulate increased use and
analysis of satellite wave products.
In addition to common format satellite data GlobWave
shall provide comparisons with in situ measurements,
interactive data analysis tools and an enhanced wave
forecast verification scheme for operational forecast
production centres.
www.globwave.org
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Hydrodynamics & Metocean
lfremer
www.ifremer.fr
Thank You
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