제주 우도 홍조단괴해빈의 태풍 시기 지형변화
Topographic Variability during Typhoon Events in Udo Rhodoliths Beach, Jeju Island, South Korea
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Udo Rhodolith Beach is a small-scale, mixed sand-and-gravel beach embayed on the N–S trending rocky coast of Udo, Jeju Island, South Korea. This study analyzes the short-term topographic changes of the beach during the extreme storm conditions of four typhoons from 2016 to 2020: Chaba (2016), Soulik (2018), Lingling (2019), and Maysak (2020). The analysis uses the topographic data of terrestrial LiDAR scanning and drone photogrammetry, aided by weather and oceanographic datasets of wind, wave, current and tide. The analysis suggests two contrasting features of alongshore topographic change depending on the typhoon pathway, although the intensity and duration of the storm conditions differed in each case. During the Soulik and Lingling events, which moved northward following the western sea of the Jeju Island, the northern part of the beach accreted while the southern part eroded. In contrast, the Chaba and Maysak events passed over the eastern sea of Jeju Island. The central part of the beach was then significantly eroded while sediments accumulated mainly at the northern and southern ends of the beach. Based on the wave and current measurements in the nearshore zone and computer simulations of the wave field, it was inferred that the observed topographic change of the beach after the storm events is related to the directions of the wind-driven current and wave propagation in the nearshore zone. The dominant direction of water movement was southeastward and northeastward when the typhoon pathway lay to the east or west of Jeju Island, respectively. As these enhanced waves and currents approached obliquely to the N-S trending coastline, the beach sediments were reworked and transported southward or northward mainly by longshore currents, which likely acts as a major control mechanism regarding alongshore topographic change with respect to Udo Rhodolith Beach. In contrast to the topographic change, the subaerial volume of the beach overall increased after all storms except for Maysak. The volume increase was attributed to the enhanced transport of onshore sediment under the combined effect of storm-induced long periodic waves and a strong residual component of the near-bottom current. In the Maysak event, the raised sea level during the spring tide probably enhanced the backshore erosion by storm waves, eventually causing sediment loss to the inland area.
Abstract
Udo Rhodolith Beach is a small-scale, mixed sand-and-gravel beach embayed on the N–S trending rocky coast of Udo, Jeju Island, South Korea. This study analyzes the short-term topographic changes of the beach during the extreme storm conditions of four typhoons from 2016 to 2020: Chaba (2016), Soulik (2018), Lingling (2019), and Maysak (2020). The analysis uses the topographic data of terrestrial LiDAR scanning and drone photogrammetry, aided by weather and oceanographic datasets of wind, wave, current and tide. The analysis suggests two contrasting features of alongshore topographic change depending on the typhoon pathway, although the intensity and duration of the storm conditions differed in each case. During the Soulik and Lingling events, which moved northward following the western sea of the Jeju Island, the northern part of the beach accreted while the southern part eroded. In contrast, the Chaba and Maysak events passed over the eastern sea of Jeju Island. The central part of the beach was then significantly eroded while sediments accumulated mainly at the northern and southern ends of the beach. Based on the wave and current measurements in the nearshore zone and computer simulations of the wave field, it was inferred that the observed topographic change of the beach after the storm events is related to the directions of the wind-driven current and wave propagation in the nearshore zone. The dominant direction of water movement was southeastward and northeastward when the typhoon pathway lay to the east or west of Jeju Island, respectively. As these enhanced waves and currents approached obliquely to the N-S trending coastline, the beach sediments were reworked and transported southward or northward mainly by longshore currents, which likely acts as a major control mechanism regarding alongshore topographic change with respect to Udo Rhodolith Beach. In contrast to the topographic change, the subaerial volume of the beach overall increased after all storms except for Maysak. The volume increase was attributed to the enhanced transport of onshore sediment under the combined effect of storm-induced long periodic waves and a strong residual component of the near-bottom current. In the Maysak event, the raised sea level during the spring tide probably enhanced the backshore erosion by storm waves, eventually causing sediment loss to the inland area.
참고문헌 (24)
- 김진경, "제주도 우도의 홍조단괴 해빈 퇴적물의 특징과 형성조건 : 예비연구 결과", 바다, 8(4), pp.6~410 (2003), 한국해양학회
- 우경식, "제주도 우도 지역 내 지질유산의 다양성과 가치", 헤리티지:역사와 과학, 46(1), pp.290~317 (2013), 국립문화유산연구원
- 제주 우도 홍조단괴 해빈 모니터링및 조사연구 보고서, "제주특별자치도", ㈜미래해양, 198~, pp.79-6510000-000048-01 (2015)
- 제주 우도 홍조단괴 해빈 2차 모니터링및 조사연구 보고서, "제주특별자치도", 제주대학교 산학협력단, 149~, pp.79-6500655-000007-01 (2017)
- 제주 우도 홍조단괴 해빈 4차 모니터링및 조사연구 보고서, "제주특별자치도", 제주대학교 산학협력단, 64~, pp.79-6500655-000035-01 (2020)
- 허남국, "제주도 우도 부근의 홍조단괴를 이용한 고수온과 단괴 성장률 추정: 고환경 복원에 대한 예비 연구 결과", 지질학회지, 48(4), pp.285~297 (2012), 대한지질학회
- 홍지석, "태풍 경로에 따른 제주 우도수로에서의 해류와 파랑 특성 변화", Ocean and Polar Research, 43(4), pp.205~217 (2021), 한국해양과학기술원[DOI]
- Adam DS, "Setup, deposition, and sedimentary characteristics of two storm overwash deposits, Abrahams Bosom Beach, Southeastern Australia", J Coastal Res, 24(sp1), pp.189~200 (2008)
- Basco DR, "Erosion of beaches on St. Martin Island during Hurricanes LUIS and MARILYN September 1995(Lesson for communities with beach-driven tourist economies)", Shore Beach, 64(4), pp.15~20 (1996)
- Cai F, "Xia DX(2007)Analysis on morphodynamics of sandy beach in South China", J Coastal Res, 23(1), pp.236~246 (2007)
- Cai F, "Study on the difference between storm effects of beaches on two sides of the tropical cyclone track", Adv Mar Sci, 22(4), pp.436~445 (2004)
- Cai F, "A rapid response of beach profiles to storm waves induced by No. 9914in Xiamen Island", Ocean Eng, 20(2), pp.85~90 (2002)
- Chen ZS, "The response of beaches in arc-shaped coasts to storm waves", Chinese Sci Bull, 40(23), pp.2168~2170 (1995)
- Davis Jr RA, "Beaches and coasts", pp.419~ (2004), Blackwell Science Ltd
- Jeong JB, "Influence of submarine topography and associated sedimentary processes on the distribution of live and dead rhodoliths near Udo Island, Korea", Geo-Mar Lett, 40, pp.35~51 (2020)
- Komar PD, "Beach processes and sedimentation", pp.429~ (1976)
- Lee GH, "Storm-driven variability of the beach nearshore profile at Duck, North Carolina, USA, 1981–1991", Mar Geol, 148, pp.163~177 (1998)
- Lei G, "Typhoon response model of sedimentary and geomorphological associations on Xiasha beach, Jiangtian, Fujian", J Oceanogr Taiwan Strait, 24(3), pp.395~403 (2005)
- Otvos EG, "Beach aggradation following hurricane landfall: impact comparisons from two contrasting hurricanes, Northern Gulf of Mexico", J Coastal Res, 20(1), pp.326~339 (2004)
- Qi H, "The response of three main beach types to tropical storms in South China", Mar Geol, 275, pp.244~254 (2010)
- Sallenger AH, "Hurricanes 2004: an overview of their characteristics and coastal change", Estuar Coast, 29, pp.880~888 (2006)
- Sallenger AH, "Storm impact scale for barrier island", J Coastal Res, 16(3), pp.890~895 (2000)
- Sohn YK, "The Udo tuff cone, Cheju Island, South Korea: transformation of pyroclastic fall into debris fall and grain flow on a steep volcanic cone slope", Sedimentology, 40(4), pp.769~786 (1993)
- Stockdon HF, "A simple model for the spatially-variable coastal response to hurricanes", Mar Geol, 238, pp.1~20 (2007)