Non-homogeneity of nearshore wave field from X-band radar images

Xiangbo Feng, Yixin Yan, Chia Chuen Kao, Li Chung Wu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In the application of remote sensing, X-band radar based on the land is an appropriate technique to monitor sea states and to provide time-dependent wave field. Fourier transform (FT) is the common algorithm to capture the wave information from radar images, under the assumption of homogeneous wave field. However, the nearshore wave field is non-homogeneous for the local refraction, shoaling and other nonlinear mechanisms, leading to ambiguity of wave characteristics if calculated by FT. The two-dimensional wavelet transform (2-D WT), which is skillful in catching local information, is introduced here to analyze radar images. The spatial spectrums of six different space locations are used here to compare the performance of FT and 2-D WT. The conclusion indicates that the 2-D WT implemented here is better than the FT for capturing non-homogeneous characteristics of nearshore wave filed from radar images.

Original languageEnglish
Title of host publicationThe Proceedings of the 19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE
Number of pages6
Publication statusPublished - 2009 Dec 1
Event19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE - Osaka, Japan
Duration: 2009 Jun 212009 Jun 26

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792



All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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