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Characteristics of Tidal Flow Simulation of Real Tide in West-South Coastal Waters of Korea

실조석에 의한 한국 서남해 연안역에서 해수유동의 재현특성

  • Jeong, Seung-Myong (Department of Naval Architecture and Ocean Engineering, Chonnam National University) ;
  • Park, Il-Heum (Department of Naval Architecture and Ocean Engineering, Chonnam National University)
  • 정승명 (전남대학교 조선해양공학과) ;
  • 박일흠 (전남대학교 조선해양공학과)
  • Received : 2020.07.21
  • Accepted : 2020.08.28
  • Published : 2020.08.31

Abstract

In this study, a computed tide of a real tide was introduced to improve the numerical solutions for tides and tidal flow simulations. The real tide was defined considering the nodal modulation amplitude, phase correction factor, astronomical argument, and tidal harmonic constants of all the constituents. The numerical simulation was performed using the real tide parameters for the west-south coastal waters of Korea, where the observation data for tides, tidal currents, waves, and winds over two seasons exist. The tidal flow simulation of the real tide was simulated successfully. The correlation coefficient between the observed and calculated values was 1.0, which indicated both accurate amplitude and phase. The U- and V-components of the tidal current obtained for the real tide had average valid correlations of 0.83 and 0.936, respectively. The speed error for the residual current was 0.006 m/s on the average, which indicated an insignificant difference, and the directional behavior of the residual current was very similar. In addition, the velocity error was attributed to various weather effects, such as high waves and wind storms. Therefore, this model is expected to improve current solutions provided that weathering forces, such as waves and winds, are considered.

우리나라 서남해 연안역에서 해수유동을 재현하기 위해 모든 분조를 포함하고 절점변조진폭, 위상보정인자 및 천문인수를 적용한 완전한 형태의 실조석(Real Tide)을 도입하였다. 실조석으로 해수유동을 재현한 결과, 조석의 관측치와 계산치의 상관계수는 1.0으로 진폭 및 위상의 정확도가 매우 우수하였고, U성분 및 V성분으로 구분하여 나타낸 조류는 각각 평균 0.883과 0.936의 높은 상관도를 보여 실조석으로 재현하는 것이 타당한 것으로 보였다. 그리고 잔차류의 관측치와 계산치의 차는 평균 0.006 m/s로 유의미하지 않았고, 그 진행방향은 서로 매우 유사하였다. 그리고 본 연구의 계산결과에서 관측치와 계산치 간에 나타난 유속성분 오차는 주로 고파랑이나 폭풍을 비롯한 남풍계열의 강한 바람과 같은 기상적 요인에 의한 것이 원인으로 분석되었다. 향후 해수유동 수치모형 실험에서 하나의 변수로 작용하는 기상적 요인을 고려하고 본 연구의 실조석을 재현한다면 계산결과는 더욱 향상될 것으로 기대된다.

Keywords

References

  1. Bell, C., J. M. Vassie, and P. L. Woodworth(1999), POL/ PSMSL Tidal Analysis Software Kit 2000 (TASK-2000), Permanent Service for Mean Sea Level, CCMS Proudman Oceanographic Laboratory, Bidston Observatory, Birken-head, UK, p. 15.
  2. Cho, Y. J., S. S. Hwang, I. H. Park, Y. H. Choi, S. H. Lee, Y. G. Lee, J. G. Kim, and H. C. Shin(2010), Prediction of Cohesive Sediment Transport and Flow Resistance around Artificial Structures of the Beolgyo Stream Estuary. Fisheries and Aquatic Sciences, The Korean Society of Fisheries and Aquatic Science, 13(2), pp. 167-181. https://doi.org/10.5657/fas.2010.13.2.167
  3. Choi, B. H. and Y. D. Kang(1990), Preliminary Estimation of barrier Effects on Tides in Saemangeum Area, Journal of Korean Society of Coastal and Ocean Engineers, 2(1), pp. 34-42.
  4. Falconer, R. A.(1976), Mathematical modelling of jet- forced circulation in reservoirs and harbours. Thesis submitted to Univ. of London in partial fulfillment of degree of Ph.D., Nov.
  5. Falconer, R. A.(1991), Review of modelling flow and pollutant transport processes in hydraulic basins. Proc. 1st Int. Conf. on Water Pollution: Modelling, Measuring and Prediction, Southampton, Computational Mechanics Publications, pp. 3-23.
  6. Falconer, R. A. and P. H. Owens(1987), Numerical simulation of flooding and drying and wind stress effects in a twodimensional tidal numerical model. Proc. Inst. of Civil Eng., 83, Part 2, Mar, pp. 161-180.
  7. Jeong, S. M., K. H. Kwon, J. S. Lee, and I. H. Park(2019), Prediction of Seabed Topography Change Due to Construction of Offshore Wind Power Structures in the West-Southern Sea of Korea, Journal of Korean Society of Coastal and Ocean Engineers, 31(6), pp. 423-433. https://doi.org/10.9765/KSCOE.2019.31.6.423
  8. KHOA(2017), Korea Hydrographic and Oceanographic Agency, http://www.khoa.go.kr/oceangrid/khoa/koofs.do, available at http://www.khoa.go.kr/.
  9. KMA(2017), Korea Meteorological Administration, https://data.kma.go.kr/data/sea/selectFargoBuoyRltmList.do?pgmNo=55, available at https://data.kma.go.kr/.
  10. Koo, Y. H.(1998), Changes of Tidal Characteristics due to Development of West Coastal Area. Thesis submitted to Univ. of Chungnam in partial fulfillment fo degree of Ph.D., Oct.
  11. Lee, J. S. and I. H. Park(1995), Evaluation and Numerical Model of Hydraulic Resistance by Hanging Aquaculture Facilities, Journal of the Korea Fisheries Society, 28(5), pp. 607-623.
  12. Park, I. H.(2004), Evaluation of Tidal Flow around the Pile supported Pier Structures, Journal of the Korea Society for Marine Environmental Engineering, 7(2), pp. 82-88.
  13. Park, I. H., J. S. Lee, and M. O. Lee(1998), A Numerical Model of Large Scale Grid for Two-Dimensional wake behind bodies, Journal of Korean Society of Coastal and Ocean Engineers, 10(2), pp. 83-92.