WIND SPEED RETRIEVAL FROM SATELLITE-BORNE SYNTHETIC APERTURE RADAR IN JAPANESE COASTAL WATERS
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- OHKUBO Ryoya
- 東京海洋大学大学院 海洋科学技術研究科
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- TAKEYAMA Yuko
- 東京海洋大学 学術研究院
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- IKEYA Tsuyoshi
- 東京海洋大学 学術研究院
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- OHSAWA Teruo
- 神戸大学 海事科学研究科
Bibliographic Information
- Other Title
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- Sentinel-1搭載合成開口レーダを用いた日本沿岸の海上風推定
- Sentinel-1 トウサイ ゴウセイ カイコウ レーダ オ モチイタ ニホン エンガン ノ カイジョウフウ スイテイ
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Abstract
<p> Coastal wind speeds retrieved from Sentinel-1 synthetic aperture radar (SAR) was compared with in-situ data observed in five coastal waters to develop more reliable methods for offshore wind assessments. All SAR images was resampled with a resolution of 100 m and 500 m to reduce speckle noise. As a result, Biases and RMSEs of SAR retrieved wind speeds with the 500 m spatial resolution are -0.62 to 0.88 m/s and 1.31 to 1.75 m/s, respectively. Additionally, the SAR wind speeds with the 500 m spatial resolution have higher accuracies than those with the 100 m spatial resolution in all coastal waters. That is why the 500 m spatial resolution can reduce an effect of strong backscatters from artificial structures (e.g. observation masts, buoys and ships) in SAR images. It is also found that breaking waves, which often occur in shallow waters, lead to the strong backscatter in SAR images. Consequently, the SAR wind speed shows higher than the in-situ wind speed in such coastal waters though the effect of breaking waves does not appear when the wind speed is more than 12 m/s.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 76 (2), I_49-I_54, 2020
Japan Society of Civil Engineers