1. Laboratory of Oceanography & Geosciences, Wimereux, France
The role of Academia
Alexei Sentchev, PhD
Laboratory of Oceanography & Geosciences, Wimereux, France
Conference
30TH SEPTEMBER – 1ST OCTOBER, PORT OF DOVER

2. Laboratory of Oceanography & Geosciences UMR 8187 LOG (CNRS - UL1 - ULCO)
htpp://log.univ-littoral.fr

3. Facilities Oceanographic vessel Sepia II (INSU) Zodiac Lab rooms
Cytometer
Thermostated rooms
Chemical analyses (CHN, HPLC…)
Many different sensors for in situ physico-chemical measurements (velocimeters, oxygen, pH, temperature, salinity, PAR, swell, fluorometers…)
Numeric cameras, High speed camera
MInversed microscope
Epifluorescence microscope
Scanning Electron Microscopy (SEM)
Optic grape
ROV

4. Academia - Industry partnership … and the Progress
Igor Kourchatov
Vagn Walfrid Ekman

5. Wind industry Turbine test in wind tunnel is not sufficient
Geophysical flow dynamics is 3-dimensional:
- Variation in wind speed coupled with variation in direction causes hard damage
- Re nb increases along with the device size: more load – more fatigue – more damage
Significant increase of damage is observed as the size of wind turbines increases

6. Resource characterization in the Iroise Sea (W.Brittany)
Two HF radars operating at 12.4 MHz since July 2006.
Resolution: 1.5 km along beam, 2° angular, 20 min temporal resolution
Velocity times series available since 04/2007 (corrected for sea state)
Iroise Sea and radar coverage zone
Surface currents measured by the radar during a tidal cycle

7. Principle of velocity measurements
Remote sensing of currents by HF radars – continuously operating system – velocity measurements over a large area, in the surface layer (not so critical for barotropic tidal flow) – provides all major metrics of a flow
Principle of velocity measurements
Transmitting/Receiving antenna arrays
Bragg peaks in backscattered energy spectra
Radial velocities from 2 radars are combined to form current vectors
Bragg peak shift provides radial velocity estimate of the current
U = f r/2

8. Radar data processing Routinely used
Direction finding (MUSIC) provides high resolution radial velocity maps
BEAM FORMING
DIRECTION FINDING
10° x 1.5 km
2° x 1.5 km
Routinely used
Variational interpolation (2dVar) - performs gap filling, smoothing, - provides velocity vector maps, curl v, div v & error estimates
more realistic
Pb: gappy data

9. Tidal flow characterization Probability density of velocity
Loc. B Fromveur Strait
Loc. A NW of the Ushant Is.

10. Asymmetry of current velocity and direction
Δθ = | θ flood - θ ebb – 180° |
0.5 < a < 2.5
12°
Neap
43° 3°
a = <Vflood>/<Vebb>

11. HFR velocities vs ADCP velocity profiles
Velocity time series in the Fromveur St.
Off-shore location
ADCP vel profile approximation
V(z)=V0 (z/d)1/α
Fromveur: α = 5.8 (ebb/flood flow)
NW Ushant: α = 6.5 (flood flow) α = 6.9 (ebb flow)
Location C
<V(avg)/V(sur)>
Mean Err (%)
NW Ushant
0.82
0.83 4
Fromveur
0.86
0.78 3

12. Power density: overall mean estimates
good location
<Pspring>
<Pneap>
<Pflood>
<Pebb>
<Psurface>
<Pbottom> A
2.8
0.3
1.9
1.5
1.6
0.5 B
2.2
0.7
1.8
1.3
0.6 Bn
1.4
0.2
0.9 Bs
2.6
1.1
kW/m2
NW U
Fromv
best location
Surface layer
Maximum P: 20 kW/m2 annual mean > 1.5 kW/m2
Bottom layer: 3 times lower
Power density: maximum (color shading) annual mean (white contour)
Fromveur: P variations during a day & a month

13. Resource assessment in Raz Blanchard
Channel Isles region
Tidal turbine farm

14. Recommendations and concluding remarks
Partnership with Academia is a good way for saving money
It offers solution to many issues
Academia is looking for applications (sharing the knowledge and technology)
There are many highly qualified people motivated for cooperation and joint activities
(we want to maintain traditions of Tesla, Kourchatov and many others …)
If you are looking for a partnership, visit our web site: log.univ-littoral.fr