JOINT OFFSHORE WIND FIELD MONITORING WITH SPACEBORNE SAR AND PLATFORM-BASED DOPPLER LIDAR MEASUREMENTS
The increasing demand for renewable energy resources has promoted the construction of offshore wind farms e.g. in the North Sea. 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 downstr...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-04-01
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| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/959/2015/isprsarchives-XL-7-W3-959-2015.pdf |
| Summary: | The increasing demand for renewable energy resources has promoted the construction of offshore wind farms e.g. in the North Sea.
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 wind turbine wakes is very complex and depends on manifold
parameters such as wind speed, wind direction and ambient atmospheric stability conditions.
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To complement and validate existing numerical models, corresponding observations are needed. While in-situ measurements with
e.g. anemometers provide a time-series at the given location, the merits of ground-based and space- or airborne remote sensing
techniques are indisputable in terms of spatial coverage. Active microwave devices, such as Scatterometer and Synthetic Aperture
Radar (SAR), have proven their capabilities of providing sea surface wind measurements and particularly SAR images reveal wind
variations at a high spatial resolution while retaining the large coverage area. Platform-based Doppler LiDAR can resolve wind fields
with a high spatial coverage and repetition rates of seconds to minutes. In order to study the capabilities of both methods for the
investigation of small scale wind field structures, we present a direct comparison of observations obtained by high resolution
TerraSAR-X (TS-X) X-band SAR data and platform-based LiDAR devices at the North Sea wind farm alpha ventus. We
furthermore compare the results with meteorological data from the COSMO-DE model run by the German Weather Service DWD.
Our study indicates that the overall agreement between SAR and LiDAR wind fields is good and that under appropriate conditions
small scale wind field variations compare significantly well. |
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| ISSN: | 1682-1750 2194-9034 |