IMPROVED DETERMINATION OF DIRECTIONAL WAVE SPECTRUM FOR SWELL WAVES USING X-BAND RADAR IMAGING

Title
IMPROVED DETERMINATION OF DIRECTIONAL WAVE SPECTRUM FOR SWELL WAVES USING X-BAND RADAR IMAGING
Author(s)
유제선; 이동영; 전기천; 윤종주
KIOST Author(s)
Yoo, Je Seon(유제선)Jun, Ki Cheon(전기천)
Publication Year
2010-07-05
Abstract
Typically, estimation of wave and current information from radar image sequences involves the following steps: 3-D discrete fast Fourier transform (FFT), surface current determination, filtering the 3-D FFT result, integration of the 3-D FFT result over the positive frequency domain, transformation of the 2-D image spectrum to a 2-D wave spectrum using a modulation transfer function, and conversion of the 2-D wave spectrum from the wavenumber domain to the frequency direction space. The spurious clutter speckles appearing below a certain wind speed (e.g. 3 m/s) tend to scatter in all directions in the image frame, while intermitted wave patches move with specific directions. In order to eliminate the drifting spurious speckles all around and retain wave features in directional motions in an image sequence, a backward image frame differencing scheme, a 2-D band-pass image filter, and a 2-D elliptic Butterworth filter are additionally applied to each individual images prior to the 3-D FFT processing step. Compared to the in situ measurements, the 2-D spectrum result of the processed image data lead to better agreements than that of the original image data
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/28816
Bibliographic Citation
32nd International Conference on Coastal Engineering, pp.61, 2010
Publisher
American Society of Civil Engineers
Type
Conference
Language
English
Publisher
American Society of Civil Engineers
Related Researcher
Research Interests

Marine meteorology,Wave modeling,Storm surge,해양기상,파랑모델링,폭풍해일

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