Determination of the spatial pattern of wave directions in the Inhomogeneous coastal ocean by marine radar image sequences

Research output: Contribution to journalArticle

Abstract

Remotely sensed images of the ocean are a useful tool for revealing wave direction information in the spatial domain. Considering wave inhomogeneities in a coastal area, this paper addresses issues concerning the analysis of local wave directions using a simultaneous time series of X-band radar echo intensities. The method employed to analyze the directional wave information in our paper is based on a cross-spectral analysis of radar echo intensity time series from several neighboring locations constituting a spatial array within a small area. Compared with simultaneous sea surface elevation records, which have demonstrated their efficacy for estimating directional wave information, the spatial wave features present in radar image sequences are more sensitive to environmental factors and image noise. To confirm the practicality of this approach, we examined the relationship between the wave directions estimated from the X-band radar and moored buoy data. Most mean wave directions and dominant wave directions estimated from the radar images are consistent with the buoy results. In most cases, the differences between the radar and buoy wave directions are within ±30°. We also present a radar image case with an obvious refracted wave pattern. The results estimated from this image case demonstrate the feasibility of determining the spatial pattern of wave directions from a highly inhomogeneous wave field.

Original languageEnglish
Article number8438447
Pages (from-to)45762-45771
Number of pages10
JournalIEEE Access
Volume6
DOIs
Publication statusPublished - 2018 Aug 16

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Marine radar
Radar
Direction compound
Time series

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)

Cite this

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title = "Determination of the spatial pattern of wave directions in the Inhomogeneous coastal ocean by marine radar image sequences",
abstract = "Remotely sensed images of the ocean are a useful tool for revealing wave direction information in the spatial domain. Considering wave inhomogeneities in a coastal area, this paper addresses issues concerning the analysis of local wave directions using a simultaneous time series of X-band radar echo intensities. The method employed to analyze the directional wave information in our paper is based on a cross-spectral analysis of radar echo intensity time series from several neighboring locations constituting a spatial array within a small area. Compared with simultaneous sea surface elevation records, which have demonstrated their efficacy for estimating directional wave information, the spatial wave features present in radar image sequences are more sensitive to environmental factors and image noise. To confirm the practicality of this approach, we examined the relationship between the wave directions estimated from the X-band radar and moored buoy data. Most mean wave directions and dominant wave directions estimated from the radar images are consistent with the buoy results. In most cases, the differences between the radar and buoy wave directions are within ±30°. We also present a radar image case with an obvious refracted wave pattern. The results estimated from this image case demonstrate the feasibility of determining the spatial pattern of wave directions from a highly inhomogeneous wave field.",
author = "Doong, {Dong Jiing} and Wu, {Li Chung} and Lai, {Jian Wu}",
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Determination of the spatial pattern of wave directions in the Inhomogeneous coastal ocean by marine radar image sequences. / Doong, Dong Jiing; Wu, Li Chung; Lai, Jian Wu.

In: IEEE Access, Vol. 6, 8438447, 16.08.2018, p. 45762-45771.

Research output: Contribution to journalArticle

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