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Journal of Korean Society of Coastal and Ocean Engineers > Volume 31(6); 2019 > Article
J Korean Soc Coast Ocean Eng 2019;31(6): 485-492. doi: https://doi.org/10.9765/KSCOE.2019.31.6.485
항해용 X-band 레이다를 이용한 해운대해수욕장 이안류 자동탐지 및 특성 분석
오찬영1, 안경모2, 천세현3
1한동대학교 건설환경연구소
2한동대학교 공간환경시스템공학부
3Department of Ocean, Earth and Atmospheric Sciences, Old Dominion University, Norfolk, Virginia, USA
Automatic Detection and Analysis of Rip Currents at Haeundae Beach using X-band Marine Radar
Chanyeong Oh1, Kyungmo Ahn2, Se-Hyeon Cheon3
1Institute of Construction & Environmental Research Handong Global University
2School of Spatial Environment System Engineering, Handong Global University, Handong-ro, 558, Pohang, Kyeongbuk 37554, Korea
3Department of Ocean, Earth and Atmospheric Sciences, Old Dominion University, Norfolk, Virginia, USA
Corresponding author: Kyungmo Ahn ,Tel: +82-54-260-1421, Email: kmahn@handong.edu
Received: December 11, 2019;  Revised: December 24, 2019.  Accepted: December 26, 2019.
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ABSTRACT
The observation system has been developed to investigate the rip currents at Haeundae beach using Xband marine radar. X-band radar system can observe shape, size, and velocity of rip currents, which is difficult to obtain through field observation by conventional device. Algorithms which automatically detect locations, shapes, and magnitudes of rip currents were developed using time averaged X-band radar sea clutter images. X-band sea clutter images are transformed through 3D FFT into 2D wave number spectrum and frequency spectrum. Rip current velocities were estimated using differences in wave-number spectra and wave frequency spectra due to Doppler shift. The algorithm was verified by drift experiments. At Haeundae beach, the radar system exactly located the rip currents and found to be sustained for 1-2 days at fixed locations.
Keywords: rip current, X-band RADAR, remote sensing, Haeundae beach, image processing
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