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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 and Lehner, Susanne and Hieronimus, Julian and Schneemann, Jörge and 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, 09. – 13. May 2016, Prague, Czech Republic.

Full text not available from this repository.

Abstract

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.

Item URL in elib:https://elib.dlr.de/98744/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Conference: http://lps16.esa.int/ Talk (abstract): http://lps16.esa.int/page_session173.php#1898p
Title:Direct Comparison of Spaceborne SAR and On-Site LIDAR Measurements of Small-Scale Wind Variations around Offshore Wind Farms
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jacobsen, SvenSven.Jacobsen (at) dlr.deUNSPECIFIED
Lehner, SusanneSusanne.Lehner (at) dlr.deUNSPECIFIED
Hieronimus, JulianJulian.Hieronimus (at) uni-oldenburg.deUNSPECIFIED
Schneemann, JörgeJ.Schneemann (at) uni-oldenburg.deUNSPECIFIED
Rosenthal, WolfgangWolfgang.Rosenthal (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Ocean Winds retrieval and applications, SAR, Renewable energy, Wind and Wave
Event Title:ESA Living Planet Symposium 2016
Event Location:Prague, Czech Republic
Event Type:international Conference
Event Dates:09. – 13. May 2016
Organizer: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 - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Bremen , Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Kaps, Ruth
Deposited On:22 Jan 2016 11:36
Last Modified:24 Aug 2016 10:43

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