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수치모델링을 통한 안목해안에서 계절에 따른 지형변동 패턴 분석
김무종(Mujong Kim),손동휘(Donghwi Son),유제선(Jeseon Yoo) 한국연안방재학회 2018 한국연안방재학회지 Vol.5 No.4
In recent years, coastal areas have been suffering from coastal erosion, such as destruction of coastal roads and military facilities. In this study, the Delft3D model was used to analyze the sediment transport pattern due to seasonal characteristics of summer and winter waves in Anmok beach of the East coast. Typhoon and high waves are mainly are coming from ENE direction in the summer season and the flows occur in the northward. In winter, high waves are incident from NE and the flows occur in the southward. These seasonal patterns were simulated by using Delft3D model. As for model input, reanalysis wave data of the past 38 years were used, and the seasonal patterns were analyzed by dividing the whole year into summer and winter season. The grid point of the 38 year reanalysis data is far from the Anmok beach, so the three model grid systems (wide grid -> intermediate grid -> detailed grid) are constructed. Most of the flows in the NW direction occurred in summer, but erosion and deposition was alternated along the coastline. In winter, sediment was deposited near Gangnung Port due to the southern flow and the southern port. Strong winter waves compared to summer tend to cause deposition around Gangnung Port throughout the year.
김선신(Kim, Sun-Sin),김무종(Kim, Mu-Jong),정종민(Jeong, Jong-Min),정진용(Jeong, Jin-Yong),유제선(Yoo, Je-Seon),심재설(Shim, Jea-Seol) 한국연안방재학회 2018 한국연안방재학회 학술발표대회 논문집 Vol.2018 No.1
스테레오 이미지를 이용한 파랑 관측기법은 WASS(Wave Acquisition Stereo System)라는 이름으로 이탈리아 ISMAR-CNR팀과 국제 공동연구로 수행하고 있으며 현재 신안 가거초 종합해양과학기지에 WASS를 구축하고 연구를 수행하고 있다. 본 연구에서는 WASS 소개와 파랑관측 결과를 제시하였다.
임학수(Hak Soo Lim),김무종(Mu jong Kim) 한국연안방재학회 2017 한국연안방재학회지 Vol.4 No.1
In this study, waves and currents observed by acoustic AWAC, VECTOR and Aquadopp Profiler in Anmok coastal waters were analysed to account for the variability of wave and current and to understand the mechanism of sediment transport generated by wave-induced current in the surf-zone. The monthly variation of wave and residual currents were analysed and processed with long-term observed AWAC data at station W1, located at the water depth of about 18m measured during from February 2015 to September 2016. Wave-induced currents were also analysed with intensive field measurements such as wave, current, suspended sediment, and bathymetry data observed at the surf-zone during in winter and summer. The statistical result of wave data shows that high waves coming from NNE and NE in winter (DEC-FEB) are dominant due to strong winds from NE. But in the other season waves coming from NE and ENE are prevalent due to the seasonal winds from E and SE. The residual currents with southeastern direction parallel to the shoreline are dominant throughout a year except in winter showing in opposite direction. The speed of ebb-dominant southeastern residual currents decreasing from surface to the bottom is strong in summer and fall but weak in winter and spring. By analysing wave-induced current, we found that cross-shore current were generated by swell waves mainly in winter with incoming wave direction about 45° normal to the shoreline. Depending on the direction of incoming waves, longshore currents in the surf-zone were separated to southeastern and northwestern flows in winter and summer respectively. The variation of observed currents near crescentic bars in the surf-zone shows different direction of longshore and cross-shore currents depending on incoming waves implying to the reason of beach erosion generating the beach cusp and sandbar migration during high waves at Anmok.
임학수(Lim, Hak-Soo),김무종(Kim, Mujong),이희준(Lee, Hee Jun),심재설(Shim, Jae-Seol) 한국연안방재학회 2017 한국연안방재학회 학술발표대회 논문집 Vol.2017 No.-
안목해안 외해에서 장기 관측한 파랑자료와 쇄파대 연안사주 인근 각부와 만부에서 집중 관측한 수리 파랑 및 표사이동 집중관측 자료를 분석하여 고파랑에 의한 해안선 방향의 흐름과 외해로 빠져나가는 흐름의 변동특성을 분석하였다. 안목해안으로 접근하는 고파랑은 동계 NNE 계열이 우세하고, 하계 ENE 계열이 우세하나 여름철 태풍과 겨울철 너울성 고파랑 모두 NE 계열로 해안선과 수직인 방향으로 전파되었다. 해안선 방향의 흐름(Longshore current)은 해안선과 비스듬하게 들어오는 파향에 의해 흐름의 방향이 결정되지만, 외해방향으로 빠져나가는 흐름(Cross-shore current)은 NE 방향으로 들어오는 파의 크기와 주기에 따라 유속의 크기가 변동되는 것으로 나타났다.
임학수(Hak Soo Lim),김무종(Mujong Kim),심재설(Jae-Seol Shim) 한국연안방재학회 2017 한국연안방재학회지 Vol.4 No.5
In this study, surface currents measured by small lagrangian GPS drifters (Aquadrifter) in Anmok coastal waters were analysed to account for the variability of nearshore surface current and wave-induced current to understand sediment transport mechanism near the crescentic bars in the surf-zone and near Kangneung breakwater and submerged breakwater in Anmok. The 8 times lagrangian drifter experiments were conducted mostly during in 2nd, 3rd, 4th intensive measurements in winter, summer, and spring seasons with long-term wave observation at the station W1. The analysed surface currents near the breakwaters in Anmok show that wave-induced currents at the middle of the submerged breakwater were separated and flowed toward the shoreline but offshore currents were dominant through the channels between the breakwaters. The longshore currents near the shoreline were flowed to the northwest (southeast) depending on the incoming waves from ENE (NNE). The surface nearshore offshore currents were generated mostly by waves and winds in case of high and low wave energy environments. Using the small-size lagrangian surface drifter experiments, we successfully measured longshore and offshore wave-induced currents in the surf-zone and near submerged breakwater close to Kangneung breakwater. The drifter experiment results show the availability of direct observation of nearshore surface currents to understand the mechanism of sediment transport analysing observed wave-induced current and ebb-current in the surf-zone generated by incoming waves and local winds.
임학수(Lim, Hak-Soo),김무종(Kim, Mu-jong),심재설(Shim, Jae-Seol),박현주(Park, Hyun-Joo) 한국연안방재학회 2017 한국연안방재학회 학술발표대회 논문집 Vol.2017 No.-
해운대 외해에서 2013년 7월부터 장기 관측한 파랑자료와 해운대 해수욕장 전면 수심이 낮은 해역에서 집중 관측한 수리·파랑 및 표사이동 집중관측 자료를 분석하여 고파랑에 의한 동백섬과 미포항 방향으로 외해로 빠져나가는 연안류의 계절별 변동특성을 분석하였다. 동계 고파랑은 ENE 계열이 우세하며 해변으로 접근 하면서 회절과 굴절에 의한 영향으로 파랑에너지가 감소하였다. 하계 고파랑은 S 계열이 우세하며 해변으로 접근하면서 천수효과에 의해 파랑에너지가 증가하였다. 해수욕장가까이 수심이 낮은 암반 위에서 주로 쇄파에 의해 발생하는 파랑류는 ENE 계열의 파랑에 의해 주로 동백섬 방향으로 외해로 빠져나가며, S 계열의 파랑도 조류와 상호작용에 의해 동백섬 방향으로 외해로 빠져 나가는 것으로 나타났다.