Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Evaluation of Harbour Tranquility Improvement in Pohang New Port by Detached Breakwater

포항신항 도제 축조에 따른 정온도 개선 효과분석

  • Ryu, Kyong Ho (Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology) ;
  • Jeong, Weon Mu (Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology) ;
  • Kwon, Jinseong (Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology) ;
  • Chang, Yeon S. (Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology) ;
  • Baek, Won-Dae (Maritime ICT R&D Center, Korea Institute of Ocean Science and Technology) ;
  • Kim, Won Goung (Overseas Civil Engineering and Construction Dept., Ssangyong Engineering and Construction Co.)
  • 류경호 (한국해양과학기술원 해양ICT융합연구센터) ;
  • 정원무 (한국해양과학기술원 해양ICT융합연구센터) ;
  • 권진성 (한국해양과학기술원 해양ICT융합연구센터) ;
  • 장연식 (한국해양과학기술원 해양ICT융합연구센터) ;
  • 백원대 (한국해양과학기술원 해양ICT융합연구센터) ;
  • 김원종 (쌍용건설 포항신항 스웰 개선대책 시설 공사 현장사무소)
  • Received : 2020.07.31
  • Accepted : 2020.08.14
  • Published : 2020.08.31
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Abstract

Since the construction of Pohang New Port, the problems of the low harbor tranquility caused by decreasing port operation rate has been continuously reported. In order to improve the harbor tranquility, a detached breakwater (DB) has been constructed outside the outer breakwater of Pohang New Port in 2018~2020. In this study, the effectiveness of the DB was proved by comparing the reduction rates of wave heights that were observed before and after the construction of the DB. First, the observed data were compared with the numerical model results available from a previous study, and the model data showed reasonable agreement with measured data at 3 out of 4 locations inside the port. The discrepancy in one of the locations was because the model could not accurately calculated the effect of wave interference in the inner corner of the port. The observation data showed excellent results that the number of waves that exceeded 0.3 m, the critical value to reach desired harbor tranquility, was significantly reduced after the construction of the DB. In addition, the reduction rate, the ratio of wave heights between outside and inside of the port, was decreased after the DB construction, which proved that properly designed coastal structures such as DB in this study could be effective in improving the port tranquility. The results of this study can be usefully applied for solving problems in similar cases.

포항신항이 단계별로 완공된 후 제기되어 온 항내정온도 불량 문제는 항만가동율 저하의 주요 원인으로 제기되어 왔으며 이의 개선을 위해 2018~2020년 포항신항 외항방파제의 외해 측에 도제(Detached breakwater)를 건설하고 있다. 본 연구에서는 도제의 효과를 검증하기 위하여 도제 설치 전후로 취득된 항내외의 파랑 관측자료를 분석하여 항내에서의 파고감소율을 비교한 결과를 제시한다. 먼저 이전 수치모델 연구를 통해 예측된 파고는 항내 4개 지점 중 3개 지점에서 관측값과 비슷하게 나타났으며 나머지 1개 지점에서의 오차는 수치모델이 부두 안쪽에 발생하는 중복파 현상을 잘 재현하지 못했기 때문으로 판단된다. 도제 건설 전후 기간의 관측값을 비교한 결과 도제 설치가 항내정온도 개선에 기여한 것으로 나타났는데, 항내 4개 관측지점 모두에서 포항신항 정온 목표파고인 0.3 m를 초과하는 파고의 출현빈도가 도제 건설 후에 크게 감소하였다. 또한 항내외 파고를 비교한 항내 파고 감소율도 모든 파향에 대해 도제 건설 후에 유의미하게 개선된 것으로 나타났다. 본 연구결과는 적절하게 설치된 연안구조물이 항내정온도 향상에 기여하는 효과를 증명한 것으로 향후 유사한 경우의 문제 해결에 유용하게 적용될 수 있음을 보여준다.

Keywords

References

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