The role of Academia

Conference

30TH SEPTEMBER – 1ST OCTOBER, 2015 PORT OF DOVER

Alexei Sentchev, PhD Laboratory of Oceanography & Geosciences, Wimereux, France

Laboratory of Oceanography & GeosciencesUMR 8187 LOG (CNRS - UL1 - ULCO)

htpp://log.univ-littoral.fr

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

Facilities

Igor Kourchatov Vagn Walfrid Ekman

Academia - Industry partnership… and the Progress

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

Wind industry

Significant increase of damage is observed as the size of wind turbines increases

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

Radial velocities from 2 radars are combined to form current vectors

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

Transmitting/Receiving antenna arrays

Bragg peak shift provides radial velocity estimate of the current

U = f r/2

Principle of velocity measurements

Bragg peaks in backscattered energy spectra

Direction finding (MUSIC) provides high resolution radial velocity maps

BEAM FORMING DIRECTION FINDING

Variational interpolation (2dVar) - performs gap filling, smoothing,- provides velocity vector maps, curl v, div v & error estimates

10° x 1.5 km 2° x 1.5 km

Pb: gappy data

Radar data processingRo

utine

ly u

sed

more realistic

Probability density of velocity

Loc. B Fromveur Strait

Loc. A NW of the Ushant Is.

Tidal flow characterization

12°

3°43°

Δθ = | θ flood - θ ebb – 180° |

Asymmetry of current velocity and direction

0.5 < a < 2.5

Neap

a = <Vflood>/<Vebb>

HFR velocities vs ADCP velocity profiles

Location C <V(avg)/V(sur)>

Mean Err (%)

NW Ushant 0.82 0.83 4

Fromveur 0.86 0.78 3

Velocity time series in the Fromveur St.

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)

Off-shore location

good location

Power density: overall mean estimates

kW/m2

NW U

Fro

mv

best location Surface layerMaximum P: 20 kW/m2

annual mean > 1.5 kW/m2Bottom layer: 3 times lower

Power density: maximum (color shading) annual mean (white

contour) Fromveur: P variations during a day & a month

Resource assessment in Raz BlanchardChannel Isles region

Tidal turbine farm

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