• 한국해안·해양공학회논문집
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• 제21권1호
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• pp.79-90
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• 2009

본 논문에서는 심해부터 천해에 까지 적용가능한 동적결합형 태풍 해일-조석-파랑 수치모델을 태풍 매미에 적용하여 모델의 안정성과 정확성을 검증하였다. 동적결합형 모델은 해수유동 모델인 POM을 수정한 모듈과 심해 풍파모델인 WAM을 심해부터 천해까지 적용가능하도록 수정한 모듈로 구성되어 있다. 수정 POM 모듈에서 조위, 조류 와 해일을 계산하며, 수정 WAM 모듈에서 풍파를 계산하여 상호 계산된 결과를 주고 받도록 결합된 동적결합형 모델이다. 수정 WAM 모듈에서는 잉여응력과 바람에 의한 마찰응력, 해수면 조도계수 등의 계산결과가 POM으로 제공되며 수정 POM 모듈에서는 유속, 조위면 등의 정보가 WAM으로 제공된다. 개발된 수치모델을 태풍 매미에 적용하여 계산된 결과를 관측된 파랑 및 조위자료와 비교하여 정확성을 검증하였다.

• 한국해안·해양공학회논문집
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• 제32권4호
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• pp.252-261
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• 2020

2018년 남해안에 내습한 태풍 콩레이에 의해 발생한 폭풍해일과 파랑을 일본 기상청의 기상자료인 JMA-MSM 기상 예보 자료를 이용하여 수치모의하고 남동 해안의 항만에서 관측된 폭풍해일 시계열 자료와 비교 검증하였다. 폭풍해일과 동시에 발생하는 파랑에 대해서는 국립해양조사원과 기상청에서 운영하는 해상 파고부이 자료 및 한국해양과학기술원에서 관측한 연안 AWAC 파고계 자료와 비교하여 검증하였다. 기상자료에 따른 폭풍해일과 파랑의 정밀도를 파악하기 위해 미국 합동태풍경보센터인 JTWC에서 제공하는 best track을 이용하여 생성된 기압장과 바람장을 이용한 수치모의를 수행하고 비교 분석하였다. 이 연구를 통하여 정도 높은 폭풍해일과 파랑을 추산하기 위해 신뢰도 높은 기상장이 필수적임을 알 수 있었다.

• Ocean and Polar Research
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• 제43권4호
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• pp.205-217
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• 2021

A shallow channel between Jeju and Udo Islands, which is located in the northeastern Jeju Island, is influenced by storm- or typhoon-induced currents and surface waves as well as strong tidal currents. This study examines the typhoon-induced current and wave patterns in the channel, using Acoustic Doppler Current Meter (ADCP) measurements and an ocean-wave coupled modeling experiment. Three typhoons were chosen - Chaba (2016), Soulik (2018), and Lingling (2019) - to investigate the responses of currents and waves in their pathways. During the pre-typhoon periods, dominant northward flow and wave propagation were observed in the channel due to the southeasterly winds before the three typhoons. After the passage of Chaba, which passed over the eastern side of Jeju Island, the northward flow and wave propagation were totally reversed to the opposite direction, which was attributed to the strong northerly winds on the left side of the typhoon. In contrast, in the cases of Soulik and Lingling, which passed over the western side of Jeju Island, strong southerly winds on the right side of the typhoons continuously intensified the northward current and wave propagation in the channel. The model-simulated current and wave fields reasonably coincided with observational data, showing southward/northward flow and wave propagation in response to the right/left side of the typhoon pathways. Typhoon-induced downwind flows, and surface waves could enhance up to 2m/s and 3m due to the strong winds that lasted for more than 12 hours. This suggests that the flow and wave patterns in the Udo channel are highly sensitive to the pathway of typhoons and accompanying winds; thus, this may be a crucial factor with regard to the movement of seabed sediments and subsequent coastal erosion.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.874-875
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• 2005

• 한국수산과학회지
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• 제26권6호
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• pp.567-579
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• 1993

태풍통과시 동해의 일본북구연안에서의 수위변동을 조사하기 위해 $1966{\sim}1986$년간의 시간별수위자료분석 및 고분해능($5'{\times}5'$)을 갖는 천해파모델상에서의 수치실험을 행하였다. 자료분석의 주결과는 1) 태풍통과시 Simonoseki(SS)와 Maizuru(MZ) 간에 약 4m/s의 위상속도를 갖는 진행파가 존재하나, 2) Sasebo(SB)와 Hakata(HK) 간에는 파속이 매우 느리고(약 1.7 m/s), 3) HK에서는 SS에 비해 약 반나절 늦게 최대수위에 도달하는 점등이었다. 실험결과는 관측결과와 좋은 대응을 보였다. 실험결과로 볼 때, 연안에 전파하는 진행파는 관측결과와 거의 같은 위상속도 약 4 m/s를 갖는 지형성파로서 확인된다. 태풍이 대한해협을 통과하기전에는 일본연안에 평행한 바람에 의해 생성된 남서방향의 연안젯트류에 의해 파의 전파가 영향을 받고, 태풍이 통과한 후에는 연안젯트류가 약해지면서 파가 전파하게 된다.

• 한국해양공학회지
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• 제19권2호
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• pp.12-18
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• 2005

Typhoon Maemi landed on the southeast coast of Korea and caused a severe storm surge in Jinhae Bay and Masan Bay. The tide gage in Masan Port recorded the storm surge of a maximum of more than 2m and the area of more than 700m from the Seo Hang Wharf was flooded by the storm surge. They had not met such an extremely severe storm surge since the opening of the port. Then storm surge was hindcasted with a numerical model. The typhoon pressure was approximated by Myers' empirical model and super gradient wind around the typhoon eye wall was considered in the wind estimation. The land topography surrounding Jinhae Bay and Masan Bay is so complex that the computed wind field was modified with the 3D-MASCON model. The motion of seawater due to the atmospheric forces was simulated using a one-layer model based on non-linear long wave approximation. The Janssen's wave age dependent drag coefficient on the sea surface was calculated in the wave prediction model WAM cycle 4 and the coefficient was inputted to the storm surge model. The result shows that the storm surge hindcasted by the numerical model was in good agreement with the observed one.

• 한국해안·해양공학회논문집
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• 제32권4호
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• pp.273-283
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• 2020

2012년 서해에 내습한 태풍 볼라벤에 의해 발생한 폭풍해일과 파랑을 일본 기상청의 JMA-MSM 기상 예보 자료를 이용하여 수치모의하고, 계산된 해일고를 전국 해안의 항만에서 관측된 폭풍해일 자료와 비교하였다. 폭풍해일과 동시에 발생하는 파랑에 대해서는 해양조사원과 기상청에서 운영하는 해상 파고부이 자료와 비교하여 검증하였다. 기상자료에 따른 폭풍해일과 파랑의 특성을 파악하기 위해 미국 합동태풍경보센터인 JTWC에서 제공하는 best track을 이용하여 생성된 기압장과 바람장을 이용한 수치모의를 수행하고 비교하여 분석하였다. JMA-MSM 기상장은 지형과 선행 배경 기상장이 잘 반영되어 태풍 통과 전후의 전 기간에 걸쳐 파랑과 폭풍해일을 비교적 잘 재현한 반면, JTWC best track을 이용하여 생성된 기상장은 태풍 영향 구역이 협소하여 파랑과 해일고의 시간적 변화 등 전반적인 추세를 반영하지 못하는 등 한계가 있었다. 이 연구를 통하여 폭풍해일과 파랑을 추산하기 위해 신뢰도 높은 기상장이 필수적임을 알 수 있었다.

• Ocean Science Journal
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• 제41권4호
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• pp.245-254
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• 2006

Long term wave climate of both extreme wave and operational wave height is essential for planning and designing coastal structures. Since the field wave data for the waters around Korean peninsula is not enough to provide reliable wave statistics, the wave climate information has been generated by means of long-term wave hindcasting using available meteorological data. Basic data base of hindcasted wave parameters such as significant wave height, peak period and direction has been established continuously for the period of 25 years starting from 1979 and for major 106 typhoons for the past 53 years since 1951 for each grid point of the North East Asia Regional Seas with grid size of 18 km. Wind field reanalyzed by European Center for Midrange Weather Forecasts (ECMWF) was used for the simulation of waves for the extra-tropical storms, while wind field calculated by typhoon wind model with typhoon parameters carefully analyzed using most of the available data was used for the simulation of typhoon waves. Design wave heights for the return period of 10, 20, 30, 50 and 100 years for 16 directions at each grid point have been estimated by means of extreme wave analysis using the wave simulation data. As in conventional methodsi of design criteria estimation, it is assumed that the climate is stationary and the statistics and extreme analysis using the long-term hindcasting data are used in the statistical prediction for the future. The method of extreme statistical analysis in handling the extreme vents like typhoon Maemi in 2003 was evaluated for more stable results of design wave height estimation for the return periods of 30-50 years for the cost effective construction of coastal structures.

• 한국지형학회지
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• 제23권1호
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• pp.129-140
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• 2016

Camera monitoring data for 5 years from January 2009 to January 2014 are analyzed to investigate changes in beach erosion on Sangju, Gujora and Haeundae beaches on the South sea and Jungmun beach on the south shore of Jeju Island. The data show the time series of beach area changes obtained from digital orthoimages rectified from oblique images taken near the beaches by cameras. Each beach has different sediment sizes and shapes, but faces the South and is eroded mainly during Typhoons. However, each beach often responds differently to the same Typhoon, and some beaches outside the influence of the Typhoon are also eroded. This study shows that high frequency data of beach area changes obtained from cameras can effectively analyze the seasonal changes in beach area.

• 대기
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• 제19권1호
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• pp.93-106
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• 2009

Analysis has been made on the wind wave characteristics in terms of significant wave height ($H_s$) near the Korean marginal seas in the 2006 - 2007 year using the third generation wave model, WAVEWATCH - III model. In order to evaluate its performance, its results were compared with the observed data using KMA ocean buoy. The two year average RMSE between modeled and observed Hs shows reasonably small value of about 0.37 m. The accuracy of predicted values in the year 2007 is increased mainly due to finer model grid size and better accurate wind field. The model used in this study predicts very well the characteristics ($H_s$) of wind waves near the Korean Peninsular. Simulated monthly wind waves show the evident seasonal variations due to Typhoons in summer season. When Typhoons approach to Korean Peninsular, the accuracy of wind waves predictions is lower than that of annual mean value.