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

  • 제33권6호
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  • Pages.298-307
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  • 2021
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  • 1976-8192(pISSN)
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  • 2288-2227(eISSN)
한국해안·해양공학회 (Korean Society of Coastal and Ocean Engineers)
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하계 해수면 상승이 폭풍해일고 분석에 미치는 영향

Effect of Summer Sea Level Rise on Storm Surge Analysis

  • 김아정 ((주)더해본) ;
  • 이명희 (군산대학교 해양산업공학과) ;
  • 서승원 (군산대학교 해양건설공학과, (주)더해본)
  • Kim, A Jeong (The sea-born eXperts) ;
  • Lee, Myeong Hee (Department of Ocean Science & Engineering, Kunsan National University) ;
  • Suh, Seung Won (Department of Coastal Construction Engineering, Kunsan National University, The sea-born eXperts)
  • 투고 : 2021.12.07
  • 심사 : 2021.12.20
  • 발행 : 2021.12.31
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초록

태풍은 7~10월에 집중적으로 발생하며, 이 시기에 해수면도 가장 높게 나타난다. 특히 우리나라 하계 해수면은 연평균과 비교했을 때 서해안 약 14.5 cm, 남해안 약 9.0~14.5 cm, 동해안 약 9.0 cm 내외로 더 높게 나타난다. 하계에 상승하는 해수면과 대형 태풍이 겹치면 연안 저지대에 침수, 범람 등의 피해를 야기할 수 있다. 따라서 연안저지대의 피해를 저감하기 위해 해안 구조물 설계 및 안정성 검토 시 정확한 해일고 산정이 필수적이다. 본 연구에서는 태풍이 영향을 미친 하계 해수면 상승이 고려된 해당 월의 평균 해수면으로부터 산정된 해일고(SH_m)를 산정하고 이를 연평균 해수면이 고려된 기존 해일고(SH_a)와 비교하여 특이현상 분석의 타당성을 재검토하였다. 연구 결과, 연평균 해수면 대비 해수면 상승 폭이 가장 큰 8~9월에 발생한 BOLAVEN(SANBA)의 직접 영향을 받은 남서(남동)해안에서 SH_a, SH_m의 해일고(cm) 차이는 7.8~24.5(23.6~34.5), 간접 영향권에 속한 남동(남서)해안에서 -1.0~0.0(8.3~12.2)로 나타난다. 그러나, 연평균 및 월평균 해수면이 비슷한 높이를 가지는 10월에 남동해안에 직접적 영향을 미친 CHABA(KONG-REY)의 경우 5.2~14.2(19.8~21.6), 간접 영향을 미친 서해안에서 3.2~6.3(-3.2~3.7)으로 직·간접 영향권 모두 SH_a와 SH_m의 차이가 작아진다. 연평균 해수면을 기준으로 산정한 기존 해일고는 상승된 하계 해수면이 고려되지 못하여, 실제 태풍 시 발생하는 해일고에 비해 과대 산정된 것으로 평가된다. 따라서 정확한 해일고 개념 정립과 함께 기존의 연평균 해수면을 고려한 해일고 기준으로 설계된 연안 시설물 마루높이 등의 타당성 검토가 재논의되어야 할 것으로 판단된다.

Typhoons occur intensively between July and October, and the sea level is the highest during this time. In particular, the mean sea level in summer in Korea is higher than the annual mean sea level about 14.5cm in the west coast, 9.0 to 14.5cm in the south coast, and about 9.0 cm in the east coast. When the rising the sea level and a large typhoon overlap in summer, it can cause surges and flooding in low-lying coastal areas. Therefore, accurate calculation of the surge height is essential when designing coastal structures and assessing stability in order to reduce coastal hazards on the lowlands. In this study, the typhoon surge heights considering the summer mean sea level rise (SH_m) was calculated, and the validity of the analysis of abnormal phenomena was reviewed by comparing it with the existing surge height considering the annual mean sea level (SH_a). As a result of the re-analyzed study of typhoon surge heights for BOLAVEN (SANBA), which influenced in August and September during the summer sea level rise periods, yielded the differences of surge heights (cm) between SH_a and SH_m 7.8~24.5 (23.6~34.5) for the directly affected zone of south-west (south-east) coasts, while for the indirect southeast (south-west) coasts showed -1.0~0.0 (8.3~12.2), respectively. Whilst the differences between SH_a and SH_m of typhoons CHABA (KONG-REY) occurred in October showed remarkably lessened values as 5.2~ 14.2 (19.8~21.6) for the directly affected south-east coasts and 3.2~6.3 (-3.2~3.7) for the indirectly influenced west coast, respectively. The results show the SH_a does not take into account the increased summer mean sea level, so it is evaluated that it is overestimated compared to the surge height that occurs during an actual typhoon. Therefore, it is judged that it is necessary to re-discuss the feasibility of the surge height standard design based on the existing annual mean sea level, along with the accurate establishment of the concept of surge height.

키워드

과제정보

이 논문은 2021년 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구이며(연안활동장소에 대한 위험도 평가 및 예측체계 개발), 또한 2021년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2020R1I1A3071573).

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