Wind resources and wind farm wake effects offshore observed from satellite
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Wind resources and wind farm wake effects offshore observed from satellite. Charlotte Bay Hasager Poul Astrup Merete Bruun Christiansen Morten Nielsen Rebecca Barthelmie Risø National Laboratory, Wind Energy Department. Motivation. Satellite data are complementary to:

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Wind resources and wind farm wake effects offshore observed from satellite

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Wind resources and wind farm wake effects offshore observed from satellite

Wind resources and wind farm wake effects offshore observed from satellite

Charlotte Bay Hasager

Poul Astrup

Merete Bruun Christiansen

Morten Nielsen

Rebecca Barthelmie

Risø National Laboratory, Wind Energy Department


Motivation

Motivation

Satellite data are complementary to:

offshore in-situ data……….that are costly

offshore model results…….that are not fully verified

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

1800 km

400 km

100 km

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

Physics

Ocean surface is roughened

by wind interaction such that

capillary and short gravity

waves are generated.

More wind causes

more steep waves that

causes higher backscatter.

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

Horns Rev, Elsam A/S

Courtesy: NOAA

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

QuikScat Mean wind speed 5 years

Grid cell:

ca. 25 km

Number of observations: 3650 (twice per day for 5 years)

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

QuikScat North

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

QuikScatEast

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

QuikScatSouth

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

QuikScat West

Weibull A and k per sector in WASP tab-file format available

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

Horns Rev, Elsam A/S

Wind field from Envisat ASAR WSM (Courtesy: JHU/APL)

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

Envisat processed at JHU/APL

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

Horns Rev (Denmark)

ERS Mean wind speed for 30 daysGrid cell: 400 m

5 km

From Nielsen et al. 2004, Risø-R-1479(EN)

EWEC 2006, Athens 27 February to 2 March 2006


91 sar wind maps

Directions from met. mast

Directions from image, LG supervised

U = 7.3 m/s

E = 421 W/m2

U = 7.8 m/s

E = 496 W/m2

91 SAR wind maps

In situ measurements (Sommer, 2003):

U = 7.6 m/s

E = 422 W/m2

Directions from image, LG automatic

U = 7.7 m/s

E = 510 W/m2

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

EWEC 2006, Athens 27 February to 2 March 2006


Wind farm sites

Wind farm sites

Blaavandshuk

Met. mast

Horns Rev

Offshore Wind Farm

N

ERS (no wind)

EWEC 2006, Athens 27 February to 2 March 2006


Wind farm wake effects

Wind farm

Wind farm wake effects

Reduced mean wind speed

Enhanced turbulence

ERS

Horns Rev

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

Y

X

x

y

EWEC 2006, Athens 27 February to 2 March 2006


Airborne sar e sar

Wind

Met. mast

5 flight tracks in C-band VV

Airborne SAR (E-SAR)

12 October 2003

EWEC 2006, Athens 27 February to 2 March 2006


Winds from e sar in cvv

Winds from E-SAR in CVV

Wind farm

Wind farm

Wind

Wind

Wind speed

Velocity deficit

EWEC 2006, Athens 27 February to 2 March 2006


Wind resources and wind farm wake effects offshore observed from satellite

Christiansen & Hasager (2006), Using airborne SAR for wake mapping offshore. Wind Energy (in press).

EWEC 2006, Athens 27 February to 2 March 2006


Conclusions

Conclusions

Wind resources can be estimated from satellite wind maps as a supplement to in-situ data.

Wake velocity deficit can be quantified from satellite wind maps.

Acknowledgements:

Danish Research Agency SAT-WIND and SAR-WAKE projects;

ESA EO-windfarm and EO-1356 projects;

Elsam A/S Meteorological data.

EWEC 2006, Athens 27 February to 2 March 2006


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