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Journal of Korean Society of Coastal and Ocean Engineers > Volume 32(6); 2020 > Article
J Korean Soc Coast Ocean Eng 2020;32(6): 587-601. doi: https://doi.org/10.9765/KSCOE.2020.32.6.587
초고해상도 둥지격자 수치모델을 이용한 울릉도-독도 해역 해양순환 모의
김대혁1, 신홍렬2, 최민범3, 최영진4, 최병주5, 서광호6, 권석재7, 강분순8
1공주대학교 대학원 대기과학과 대학원생
2공주대학교 대기과학과 교수
3(주)지오시스템리서치 해양예보사업부 전임
4(주)지오시스템리서치 해양예보사업부 책임
5전남대학교 해양학과 교수
6국립해양조사원 해양과학조사연구실 연구사
7국립해양조사원 해양과학조사연구실 연구관
8국립해양조사원 해양과학조사연구실 연구사
Simulation of the Ocean Circulation Around Ulleungdo and Dokdo Using a Numerical Model of High-Resolution Nested Grid
Daehyuk Kim1, Hong-Ryeol Shin2, Min-bum Choi3, Young-Jin Choi4, Byoung-Ju Choi5, Gwang-Ho Seo6, Seok-Jae Kwon7, Boonsoon Kang8
1Ph.D. Candidate, Department of Atmospheric Science, Kongju National University
2Professor, Department of Atmospheric Science, Kongju National University, 56 Gongjudaehak-ro, Gongju, Chungcheongnam-do 32588, Korea
3Engineer, Dept. of Marine Forecast, GeoSystem Research Corporation
4Director, Dept. of Marine Forecast, GeoSystem Research Corporation
5Professor, Department of Oceanography, Chonnam National University
6Researcher, Ocean Research Division, Korea Hydrographic and Oceanographic Agency
7Senior Researcher, Ocean Research Division, Korea Hydrographic and Oceanographic Agency
8Researcher, Ocean Research Division, Korea Hydrographic and Oceanographic Agency
Corresponding author: Hong-Ryeol Shin ,Tel: +82-41-850-8532, Email: hrshin@kongju.ac.kr
Received: November 17, 2020;  Revised: December 21, 2020.  Accepted: November 24, 2020.
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ABSTRACT
The ocean circulation was simulated in the East Sea and Ulleungdo-Dokdo region using ROMS (Regional Ocean Modeling System) model. By adopting the East Sea 3 km model and the HYCOM 9 km data, Ulleungdo 1 km model and Ulleungdo-Dokdo 300 m model were constructed with one-way grid nesting method. During the model development, a correction method was proposed for the distortion of the open boundary data which may be caused by the bathymetry data difference between the mother and child models and the interpolation/extrapolation method. Using this model, a super-high resolution ocean circulation with a horizontal resolution of 300 m near the Ulleungdo and Dokdo region was simulated for year 2018. In spite of applying the same conditions except for the initial and boundary data, the numerical models result indicated significantly different characteristics in the study area. Therefore, these results were compared and verified by using the surface current data estimated by satellites altimeter data and temperature data from NIFS (National Institute of Fisheries Science). They suggest that in general, the improvement of the one-way grid nesting with the HYCOM data on RMSE, Mean Bias, Pattern correlation and Vector correlation is greater in 300 m model than in the 1 km model. However, the nesting results of using East Sea 3 km model showed that simulations of the 1 km model were better than 300 m model. The models better resolved distinct ridge/trough structures of isotherms in the vertical sections of water temperature when using the higher horizontal resolution. Furthermore, Karman vortex street was simulated in Ulleungdo-Dokdo 300 m model due to the terrain effect of th islands that was not shown in the Ulleungdo 1 km model.
Keywords: ROMS (Regional Ocean Modeling System) model, the East Sea, super high-resolution numerical model, grid nesting method, Ulleungdo-Dokdo 300 m model
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