• Title/Summary/Keyword: SWAN

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Inundation Analysis Considering Water Waves and Storm Surge in the Coastal Zone (연안역에서 고파랑과 폭풍해일을 고려한 침수해석)

  • Kim, Do-Sam;Kim, Ji-Min;Lee, Gwang-Ho;Lee, Seong-Dae
    • Journal of Ocean Engineering and Technology
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    • v.21 no.2 s.75
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    • pp.35-41
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    • 2007
  • In general, coastal damage is mostly occurred by the action of complex factors, like severe water waves. If the maximum storm surge height combines with high tide, severe water waves will overflow coastal structures. Consequently, it can be the cause of lost lives and severe property damage. In this study, using the numerical model, the storm surge was simulated to examine its fluctuation characteristics at the coast in front of Noksan industrial complex, Korea. Moreover, the shallow water wave is estimated by applying wind field, design water level considering storm surge height for typhoon Maemi to SWAN model. Under the condition of shallow water wave, obtained by the SWAN model, the wave overtopping rate for the dike in front of Noksan industrial complex is calculated a hydraulic model test. Finally, based on the calculated wave-overtopping rate, the inundation regime for Noksan industrial complex was predicted. And, numerically predicted inundation regimes and depths are compared with results in a field survey, and the results agree fairly well. Therefore, the inundation modelthis study is a useful tool for predicting inundation regime, due to the coastal flood of severe water wave.

Numerical Analysis of Turning Performance in Waves by Considering Wave Drift Forces (파랑 표류력을 고려한 선박의 파랑 중 선회성능 해석)

  • Seo, Min-Guk;Nam, Bo Woo;Kim, Yeongyu
    • Journal of the Society of Naval Architects of Korea
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    • v.55 no.2
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    • pp.103-115
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    • 2018
  • This paper performs a numerical computation of ship maneuvering performance in waves. For this purpose, modular-type model (MMG (Mathematical Modeling Group) model) is adopted for maneuvering simulation and wave drift force is included in the equation of maneuvering motion. In order to compute wave drift force, two different seakeeping programs are used: AdFLOW based on Wave Green function method and SWAN based on Rankine panel method. When wave drift force is calculated using SWAN program, not only ship forward speed but also ship lateral speed are considered. By doing this, effects of lateral speed on wave drift force and maneuvering performance in waves are confirmed. The developed method is validated by comparing turning test results in regular waves with existing experimental data. Sensitivities of wave drift force on maneuvering performance are, also, checked.

Surfing Resources Management for Sustainable Surfing in Surfable Region - Focusing on Jukdo, Yangyang, Gangwon Province (서핑가능 지역의 지속가능한 서핑을 위한 서핑자원 관리 - 강원도 양양군 죽도해변을 중심으로)

  • Baek, Seungjun;Park, Yong Sung
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.32 no.6
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    • pp.506-515
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    • 2020
  • Surfing is a sport sensitive to changes in the natural environment, using naturally occurring waves. In other words, factors such as the construction of coastal structures, coastal erosion, and sediment transportation could cause the wave to change into a direction inappropriate for surfing at the shore where surfable waves were reaching. In this study, we call the characteristics of the coastal environment that affect the formation of surfable waves as surfing resources, which is subsequently analyzed by coastal engineering methodologies. Also, using Delft3D-WAVE module (SWAN model), a way to evaluate sustainability of surfable wave is suggested through analysis of surfing resources at Jukdo, Yangyang, Gangwon Province, Republic of Korea.

Discovery of C2 Swan Band and CN emission in Spark Discharge Experiment

  • Song, In-Ok;Mo, Younghoon;Ryu, Jein;Chang, Hoyon;Hwang, Ki-Wook;Chun, Man-Seog;Oh, Jinho;Hahn, Sangjoon
    • The Bulletin of The Korean Astronomical Society
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    • v.46 no.2
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    • pp.74.1-74.1
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    • 2021
  • 밀러-유리 실험으로 알려진 전기방전 실험은 지구초기대기를 모사하여 아미노산을 합성하여, 지구에서 생명의 기원을 연구하는 실험중의 하나이다. 메탄(CH4), 암모니아(NH3), 질소(N2) 가스를 주입하고 전기방전으로 에너지를 가했다. 그 결과 용액에서는 아미노산인 글라이신(C2H5NO2), 알라닌(C3H7NO2), 히스티딘(C6H9N3O2), 프롤린(C5H9NO2), 발린(C5H11NO2)이 검출되었고, 기존 Miller 1953과 Parker et al. 2014의 결과와 비교하였다. 전기방전에서는 C2 Swan Band 와 CN emission을 발견하였다. 이 두 방출선들은 혜성에서도 일반적으로 보여지는 방출선들이다.

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Numerical Simulation of Regular Wave Transformation due to Wave-induced Current over a Submerged Elliptic Shoal (수중타원형 천퇴를 통과하는 규칙파의 파랑쇄파류에 의한 변형)

  • Choi, Jun-Woo;Baek, Un-Il;Yoon, Sung-Bum
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.19 no.6
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    • pp.557-564
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    • 2007
  • The effect of wave and current interactions on regular wave transformation over a submerged elliptic shoal is investigated based on numerical simulations of the Vincent and Briggs experiment [Vincent, C.L., Briggs, M.J., 1989. Refraction-diffraction of irregular waves over a mound. Journal of Waterway, Port, Coastal and Ocean Engineering, 115(2), pp. 269-284]. The numerical simulations are conducted by constituting two numerical model systems: a combination of SWAN(a wave model) plus SHORECIRC(a current model) and a combination of REF/DIF 1(a wave model) plus SHORECIRC. A time dependent phase-resolving wave-current model, FUNWAVE, is also utilized to simulate the experiment. In the simulations, the breaking-induced currents defocus waves behind the shoal and bring on a wave shadow zone that shows relatively low wave height distributions. The computed results of the two model systems agree better with the measurements than the computed results obtained by neglecting wave-current interaction do. However, it is found that the radiation stresses for standing waves are misevaluated in the wave models. In addition, the results of FUNWAVE show very good agreement with the measurements. The agreement indicates that it is necessary to take into account the effect of breaking-induced current on wave refraction when wave-breaking occurs over a submerged shoal.

Analysis of Littoral Currents by the Coupled Hydrodynamic Model (복합해수유동 수치모형에 의한 조간대 연안류의 해석)

  • Lee, Jong-Sup;Kwon, Kyong-Hwan;Park, Il-Heum
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.20 no.2
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    • pp.247-258
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    • 2014
  • To evaluate the influence of the external force components on the littoral currents in the Gusipo beach, Jeonbuk, West Coast of Korea where a wide tidal sand flat developed, a coupled hydrodynamic model considered real time tidal currents and wave-induced currents was constructed in which the EFDC for tides and tidal currents, the SWAN for waves and the SHORECIRC for wave-induced currents were used as the hindcasting models. A series of field observations for tides, tidal currents and incident waves were carried out and especially to observe the littoral currents in the tidal sand flat, the GPS mounted and light weight drogues were used. Also wind data were collected from the adjacent weather station. To analyze the littoral current components, the numerical drogue tracking results considered real time winds, tides and waves were compared with the field drogue data. The drift speed of numerical drogues was reproduced as the range of 68.0~105.2% compared with the field data and the velocity error of main direction component showed a good result as -16.7~10.0%. As a result, in the mild slope tidal flat including wide surf zone, the tides and winds were the major affection component of the littoral currents, on the other hand, the wave-induced currents seemed the minor component when the incident wave heights were relatively small.

Shallow-water Design Waves at Gangreung Beach through the Analysis of Long-term Measured Wave Data and Numerical Simulation Using Deepwater Wave Conditions (장기 파랑관측자료 분석 및 천해파 수치실험에 의한 강릉 해역의 천해설계파)

  • Jeong, Weon Mu;Jun, Ki Cheon;Kim, Gunwoo;Oh, Sang-Ho;Ryu, Kyong-Ho
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.24 no.5
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    • pp.343-351
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    • 2012
  • In this study, shallow-water design waves are calculated for the return period of 10, 20, 30, and 50 years, based on the extreme value analysis of the wave measurement data at Gangneung beach. These values are compared with the results of SWAN simulation with the boundary condition of the deep-water design waves of the corresponding return periods at the Gangneung sea area provided by the Fisheries Agency (FA, 1988) and Korea Ocean Research & Development Institute (KORDI, 2005). It is found that the shallow-water wave heights at Gangneung beach calculated by the deep-water design waves were significantly less than the observation data. As the return period becomes higher, the significant wave heights obtained by the extreme value analysis becomes higher than those computed by SWAN with the deep-water design waves of the corresponding return periods. KORDI computed the hindcast wave data from January 2004 to August 2008 by WAM with a finer-grid mesh system than those of previous studies. Comparisons of the wave hindcast results with the wave observation show that the reproducibility of the winter-season storm wave was considerably improved compared to the hindcast data from 1979 to 2003. Hereafter, it is necessary to carry out hindcast wave data for the years before 2004 using WAM with the finer-grid mesh system and to supplement the deep-water design wave.

A Becoming-Nonhuman Animal in the Neurological State of Exception: Black Swan and Birdman (신경학적 예외상태에서 비인간적 동물-되기: <블랙스완>과 <버드맨>)

  • Park, Jecheol
    • Cross-Cultural Studies
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    • v.50
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    • pp.1-29
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    • 2018
  • In the contemporary American cinematic landscape, there is a distinctive tendency to depict the disturbing ways in which characters with brain damages perceive, remember, and think about the world. Despite its attempts to examine the socio-political implications of these characters' subjectivities, the previous scholarship on this trend of film was limited in being either too pessimistically deterministic or too euphorically optimistic. Critically reading neuroscientific discourses on the brain-damaged subject from the perspective of Giorgio Agamben's critique of biopolitics, this paper explores how the contemporary American cinema of the impaired brain attempts to mediate the neurologically inexplicable affects of those subjects who are in the neurological state of exception and to express their experiences of a becoming-nonhuman. By closely reading Darren Aronofsky's Black Swan and Alejandro $Gonz{\acute{a}}lez$ $I{\tilde{n}}{\acute{a}}rritu^{\prime}s$ Birdman in this regard, I show how the two films, by employing different sets of cinematic free indirect techniques, express the neurologically impaired subject's affective experience of a becoming-nonhuman animal in different ways, and thereby to a more or less extent act as 'profaned' neuro-biopolitical apparatuses.

A Study on National Response Strategies of Large-scale Marine Disaster (대규모 해양재난의 국가적 대응전략에 관한 연구)

  • Lee, Choonjae
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.25 no.5
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    • pp.550-559
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    • 2019
  • The sinking of the M/V SEWOL in April 2014 was not a mere marine accident, but a marine catastrophe. This grim case developed into a social tragedy that impinged the national sentiment and communal integrity. It is imperative that thorough provisions and measures be outlined at the national level with regard to massive marine accidents, oil pollution, and natural disasters that might critically affect government affairs. Pivoting on "The Black Swan Theory," a concept of improperly rationalizing a national crisis based on uncertainties, this research assesses a variety of response strategies that minimize the national economic and social damage caused by a large-scale marine disaster. Along with the effort of minimizing any potential defects in each protective barrier, the "Black Swan Detection System of the Marine Disaster" needs to be incorporated to prevent cases wherein such defects lead to an actual crisis. Maritime safety must be systematically unified under a supervisory organization, and a structure for maritime crisis on-scene command and cooperation must likewise be established in order that every force on the scene of a marine disaster may act effectively and consistently under the direction of an on-scene commander.

A Study on the Improvement of Wave and Storm Surge Predictions Using a Forecasting Model and Parametric Model: a Case Study on Typhoon Chaba (예측 모델 및 파라미터 모델을 이용한 파랑 및 폭풍해일 예측 개선방안 연구: 태풍 차바 사례)

  • Jin-Hee Yuk;Minsu Joh
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.35 no.4
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    • pp.67-74
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    • 2023
  • High waves and storm surges due to tropical cyclones cause great damage in coastal areas; therefore, accurately predicting storm surges and high waves before a typhoon strike is crucial. Meteorological forcing is an important factor for predicting these catastrophic events. This study presents an improved methodology for determining accurate meteorological forcing. Typhoon Chaba, which caused serious damage to the south coast of South Korea in 2016, was selected as a case study. In this study, symmetric and asymmetric parametric vortex models based on the typhoon track forecasted by the Model for Prediction Across Scales (MPAS) were used to create meteorological forcing and were compared with those models based on the best track. The meteorological fields were also created by blending the meteorological field from the symmetric / asymmetric parametric vortex models based on the MPAS-forecasted typhoon track and the meteorological field generated by the forecasting model (MPAS). This meteorological forcing data was then used given to two-way coupled tide-surge-wave models: Advanced CIRCulation (ADCIRC) and Simulating Waves Nearshore (SWAN). The modeled storm surges and waves correlated well with the observations and were comparable to those predicted using the best track. Based on our analysis, we propose using the parametric model with the MPAS-forecasted track, the meteorological field from the same forecasting model, and blending them to improve storm surge and wave prediction.