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SAR observation and numerical modeling of tidal current wakes at the East China Sea offshore wind farm

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

Full text not available from this repository.

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/
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:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Li, Xiao-MingXiao.Li (at) dlr.de und lixm (at) radi.ac.cnUNSPECIFIED
Chi, LequanCollege of Physical and Environmental Oceanography, Ocean University of China, Qingdao, ChinaUNSPECIFIED
Chen, XueenCollege of Physical and Environmental Oceanography, Ocean University of China, Qingdao, ChinaUNSPECIFIED
Ren, YongZhengChinese Academy of Sciences, Institute of Remote Sensing and Digital Earth, Beijing, ChinaUNSPECIFIED
Lehner, SusanneSusanne.Lehner (at) dlr.deUNSPECIFIED
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 - 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 > 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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