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Direct Comparison of Spaceborne SAR and On-Site LIDAR Measurements of Small-Scale Wind Variations around Offshore Wind Farms

Jacobsen, Sven und Lehner, Susanne und Hieronimus, Julian und Schneemann, Jörge und Rosenthal, Wolfgang (2016) Direct Comparison of Spaceborne SAR and On-Site LIDAR Measurements of Small-Scale Wind Variations around Offshore Wind Farms. ESA Living Planet Symposium 2016, 2016-05-09 - 2016-05-13, Prague, Czech Republic.

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Kurzfassung

The increasing popularity of renewable energy resources has promoted the construction of offshore wind farms, particularly in the German Bight. While the wind farm layout consists of an array of large turbines, the interrelation of wind turbine wakes with the remaining array is of substantial interest. The downstream spatial evolution of turbulent wakes is very complex and depends on manifold parameters such as wind speed, wind direction and ambient atmospheric stability conditions. Besides the wake properties of single turbines, the interrelation of adjacent wind farms is a major subject of interest. To complement and validate existing numerical models, corresponding observations with high spatial resolution are needed. Over the past four decades, spaceborne remote sensing of sea surface winds with microwave sensors has developed into a mature technology. It is now playing an important role in Earth Observation (EO) due to the capability to measure with high spatial coverage and almost unaffected by weather conditions. Hence, the observations are commonly used for the improvement of numerical weather prediction (NWP). While scatterometers yield only coarse-resolution data, synthetic aperture radar (SAR) has proven to measure local wind related sea surface roughness with both, high resolution and wide coverage. On the other hand, earth-bound remote sensing techniques have evolved significantly. Especially Doppler LiDAR has become an important tool for offshore wind energy related research in the last years. Ground-based LiDAR windscanners enable to measure vertical wind profiles or horizontal planar scans of the radial wind speed within a range of several kilometres. While both methods have been successfully validated against meteorological models and in-situ point measurements, we present a direct comparison of platform based LiDAR measurements and high resolution 2D sea surface wind fields derived from spaceborne SAR. The analysis is further supported by a comparison with data from the numerical meteorological model COSMO-DE run by the German Weather Service (DWD). Our contribution will contain a comparison of a series of simultaneous wind field observations around the offshore wind farms “alpha ventus” and “Riffgat” in the North Sea taken with TerraSAR-X, Sentinel-1 and two scanning long range LiDAR systems. Both techniques are compared with a special focus on small scale variations in wind fields both, upstream and downstream from the wind facilities. Methods that have been developed to account for different measuring heights and scan duration of the two independent datasets will be presented and discussed regarding the applicability for turbulent atmospheric conditions predominant in the wake structures downstream of the wind turbines. Our initial results indicate that high resolution SAR-based wind fields are well-suited to identify and quantify small scale wind variations and therefore represent a valuable complementary data source for numerical models of offshore wind farms and NWP in general.

elib-URL des Eintrags:https://elib.dlr.de/98744/
Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen:Conference: http://lps16.esa.int/ Talk (abstract): http://lps16.esa.int/page_session173.php#1898p
Titel:Direct Comparison of Spaceborne SAR and On-Site LIDAR Measurements of Small-Scale Wind Variations around Offshore Wind Farms
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Jacobsen, SvenSven.Jacobsen (at) dlr.dehttps://orcid.org/0000-0003-4810-4186NICHT SPEZIFIZIERT
Lehner, SusanneSusanne.Lehner (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hieronimus, JulianJulian.Hieronimus (at) uni-oldenburg.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schneemann, JörgeJ.Schneemann (at) uni-oldenburg.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Rosenthal, WolfgangWolfgang.Rosenthal (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2016
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Ocean Winds retrieval and applications, SAR, Renewable energy, Wind and Wave
Veranstaltungstitel:ESA Living Planet Symposium 2016
Veranstaltungsort:Prague, Czech Republic
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:9 Mai 2016
Veranstaltungsende:13 Mai 2016
Veranstalter :ESA & Ministry of Transport, Ministry of Environment and Ministry of Education, Youth and Sports of the Czech Republic and the local support from Charles University in Prague
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (alt)
Standort: Bremen , Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung
Institut für Methodik der Fernerkundung > SAR-Signalverarbeitung
Hinterlegt von: Kaps, Ruth
Hinterlegt am:22 Jan 2016 11:36
Letzte Änderung:24 Apr 2024 20:04

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