Li, Xiao-Ming and Chi, Lequan and Chen, Xueen and Ren, YongZheng and Lehner, Susanne (2014) SAR observation and numerical modeling of tidal current wakes at the East China Sea offshore wind farm. Journal of Geophysical Research - Oceans, 119 (8), pp. 4958-4971. Wiley. doi: 10.1002/2014JC009822. ISSN 0148-0227.
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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/jgrc.v119.8/issuetoc
Abstract
A TerraSAR-X (TS-X) Synthetic Aperture Radar (SAR) image acquired at the East China Sea offshore wind farm presents distinct wakes at a kilometer scale on the lee of the wind turbines. The presumption was that these wakes were caused by wind movement around turbine blades. However, wind analysis using spaceborne radiometer data, numerical weather prediction, and in situ measurements suggest that the prevailing wind direction did not align with the wakes. By analyzing measurement at the tidal gauge station and modeling of the tidal current field, these trailing wakes are interpreted to have formed when a strong tidal current impinged on the cylindrical monopiles of the wind turbines. A numerical simulation was further conducted to reproduce the tidal current wake under such conditions. Comparison of the simulated surface velocity in the wake region with the TS-X sea surface backscatter intensity shows a similar trend. Consequently, turbulence intensity (T.I.) of the tidal current wakes over multiple piles is studied using the TS-X observation. It is found that the T.I. has a logarithmic relation with distance. Furthermore, another case study showing wakes due to wind movement around turbine blades is presented to discuss the differences in the tidal current wakes and wind turbine wakes. The conclusion is drawn that small-scale wakes formed by interaction of the tidal current and the turbine piles could be also imaged by SAR when certain conditions are satisfied. The study is anticipated to draw more attentions to the impacts of offshore wind foundations on local hydrodynamic field.
Item URL in elib: | https://elib.dlr.de/90803/ | ||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||
Additional Information: | Article first published online : 11 AUG 2014 | ||||||||||||||||||
Title: | SAR observation and numerical modeling of tidal current wakes at the East China Sea offshore wind farm | ||||||||||||||||||
Authors: |
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Date: | 11 August 2014 | ||||||||||||||||||
Journal or Publication Title: | Journal of Geophysical Research - Oceans | ||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||
Open Access: | No | ||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||
Volume: | 119 | ||||||||||||||||||
DOI : | 10.1002/2014JC009822 | ||||||||||||||||||
Page Range: | pp. 4958-4971 | ||||||||||||||||||
Publisher: | Wiley | ||||||||||||||||||
ISSN: | 0148-0227 | ||||||||||||||||||
Status: | Published | ||||||||||||||||||
Keywords: | SAR, numerical simulation, tidal current wakes, wind turbulence wakes, offshore wind farm | ||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||
HGF - Program: | Space | ||||||||||||||||||
HGF - Program Themes: | Earth Observation | ||||||||||||||||||
DLR - Research area: | Raumfahrt | ||||||||||||||||||
DLR - Program: | R EO - Earth Observation | ||||||||||||||||||
DLR - Research theme (Project): | R - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old) | ||||||||||||||||||
Location: | Bremen , Oberpfaffenhofen | ||||||||||||||||||
Institutes and Institutions: | Remote Sensing Technology Institute > SAR Signal Processing | ||||||||||||||||||
Deposited By: | Kaps, Ruth | ||||||||||||||||||
Deposited On: | 15 Dec 2014 09:34 | ||||||||||||||||||
Last Modified: | 06 Sep 2019 15:27 |
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