Estimation of Directional Wave Spectra from HF Radar Sea Echo Doppler Spectra

Shoichiro Kojima, Noriaki Hashimoto, Yuji Sato

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

2 被引用数 (Scopus)

抄録

The use of oceanic radar to measure currents at the sea's surface has become practicable. Many observations of currents in coastal zones have, in fact, provided quite worthwhile results. In contrast to this, the measurement of ocean waves by oceanic radar is still at the theoretical level. Bayesian estimation may be applied to obtain directional wave spectra from Doppler spectra. This method is, in theory, applicable, but noise contaminates the measured Doppler spectra so that they deviate significantly from the ideal. Bayesian estimation relies solely on second-order backscattering components, yet accurate estimation of directional wave spectra from observed Doppler spectra requires the proper separation of the first- and second-order backscattering components of the Doppler spectra; this is a difficult task because of the great variety of observed Doppler spectra. A method where we apply wavelet multiple-resolution analysis to separate out the first- and second-order backscattering components of the spectra is discussed. In addition, a new method where we apply both the first- and second-order backscattering components to obtain directional wave spectra that have better resolution is described. Finally, HF oceanic-radar facilities along the Kashima coast were used to conduct a series of field measurements of Doppler spectra, from which the directional wave spectra were then estimated. Simultaneous observations were made with a wave-gage array, and subsequent comparison showed good agreement with the results obtained from the HF oceanic radar observations.

本文言語英語
ホスト出版物のタイトルProceedings of the 28th International Conference on Coastal Engineering 2002
ホスト出版物のサブタイトルSolving Coastal Conundrums, ICCE 2002
編集者Jane McKee Smith
出版社American Society of Civil Engineers (ASCE)
ページ109-120
ページ数12
ISBN(電子版)9812382380, 9789812382382
DOI
出版ステータス出版済み - 2003
外部発表はい
イベント28th International Conference on Coastal Engineering, ICCE 2002 - Cardiff, Wales, 英国
継続期間: 7 7 20027 12 2002

出版物シリーズ

名前Proceedings of the Coastal Engineering Conference
2003-January
ISSN(印刷版)0161-3782

その他

その他28th International Conference on Coastal Engineering, ICCE 2002
国/地域英国
CityCardiff, Wales
Period7/7/027/12/02

All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 海洋工学
  • 海洋学

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