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柳演善,柳靑魯 釜山水産大學校 1987 釜山水産大學 硏究報告 Vol.27 No.1
The purposes of this paper are to identify the existing state-of-the-art and to present the synthetic review and critical discussions on the analyses of coastal structures. Various methods or procedures which are currently used for the analyses of stability and functions are reviewed to define the applicability of empirical/experimental formulas and theoretical results. From the study, a useful monograph on the stability and function analyses of coastal structures is made.
韓國沿岸의 外力要素別 極値統計解析 1.長週期性 海面變動
柳靑魯,朴鍾和 釜山水産大學校 1988 釜山水産大學 硏究報告 Vol.28 No.1
The purposes of this paper are to estimate extreme water levels according to the return period from statistical analysis of annual maximum extreme seawater level data observed at 12 coastal stations in Korean peninsula by applying the Gumbel and Weibull distributions and to establish reasonable design water levels for coastal structures around the Korean peninsula. The result shows that the approximated higher high water level and the lower low water level, which have been used as design water levels, are underestimated even than the water levels of the return period 10 years. Reasonable design water levels according to the importance and the function of structures are proposed in the result.
Cheong Ro Ryu 한국해안해양공학회 1999 학술강연회 발표논문초록집 Vol.2 No.1
The aim of this study is to check the application criteria of the conventional techniques and to clarify the effects of breaker depth, sea-bed and structural core conditions on the stability in relation to the effects of uncertainty of storm duration and directional irregular waves. As the results: The destruction modes are defined, and some criteria on the damage modes and scouring/deposition in relating the wave-bottom-structural conditions using the results from field monitoring on a coastal dike and physical model experiments. It can be also emphasized that the spatial variation of the wave overtopping and toe erosion/deposition gives rise to the variation of damage level along the coastal structures. The 3-D effects on the stability should be analyzed in the design of multi-purpose/function coastal structures in consideration of the evaluation of spatial variation of damage modes and hydraulic characteristics as well as the wave distributions along the structures. It is strongly stressed what we should do under the guide of conventional studies/design processes.
The Tidal Water-Exchange Estimation Method based on Particle Tracking Model
Cheong-Ro Ryu(류청로),Jong-Kyu Kim(김종규),Dong-Guan Seol(설동관) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.4
외해와 연결된 입구를 통한 내만의 해수교환율을 파악하는 것은 내만의 수질을 관리하는 데 있어서 매우 중요하다. 본 연구에서는 마산만을 대상표로 수치적 입자추적모델을 이용하여 해수교환율의 조령에 따른 변화 및 만내의 공간적 특성 즉 지역에 따른 변화를 검토하면서 내만의 해수교환율 산정상의 문제를 논의하고, 조류에 의한 내만의 해수교환율 산정방법에 대해 정리하였다. 조령 및 조시에 따라 시시각각 산정된 해수교환율로부터 선형회귀식을 구하고, 그로부터 내만에 유입된 오염물질의 체류시간을 추정하였다. 이러한 결과를 기존의 현장관측된 결과와 비교함으로써 모델의 유용성을 검증하였다. 이 모델에 의해 계산한 해수교환율은 소조기에는 3~12 % 정도의 비율을 나타내었고, 대조기에는 20~30 % 정도의 교환율을 보여 조령에 따라 상이한 결과를 나타내었다. 구역별로 실시한 입자추적의 결과로부터 유속이 빠른 만 중앙부의 체류시간은 38일, 그리고 만내부와 외해와 연결되는 업구구역에서는 60~63일로 나타났다.
류청로(CHEONG-RO RYU),김홍진(HONG-JIN KIM) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.4
There has been increasing offshore oil exploration, drilling, and production activities, as well as a huge amount of petroleum being transported by tankers and pipelines through the ocean and costal environment. Assessment must be made of the potential risk of damage resulting from the exploration, development and transportation activities. This is achieved through predictive impact evaluations of the fate of hypothetical or real oil spills. When an oil spill occurs, planning and execution of cleanup measures also require the capability to forecast the short-term and long-term behavior of the spilled oil. A great amount of effort has been spent by government agencies, oil industries, and researchers over the past decade to develop more realistic models for oil spills. Numerous oil spill models have been developed and applied, most of which attempt to predict the oil spill fate and behavior. For an actual contingency planning, the oil fate and behavior model should be combined with an oil spill incident model, an environmental impact and risk model and a contingency planning model. The purpose of this review study is to give an overview of existing oil spill models that deal with the physical, chemical, biological, and socio-economical aspects of the incident, fate, and environmental impact of oil spills. After reviewing the existing models, future research needs are suggested. In the study, available oil spill models are separated into oil spill incident, oil spill fate and behavior, environmental impact and risk, and contingency planning models. The processes of the oil spill fate and behavior are reviewed in detail and the characteristics of existing oil spill fate and behavior models are examined and classified so that an ideal model may be identified. Finally, future research needs are discussed.
생태계 제어 시설물의 설계 및 배치 최적화 ( 2 ) - 흐름장에서의 인공어초의 침하 및 매몰 특성 -
류청로(Cheong Ro Ryu),김현주(Hyeon Ju Kim),이한수(Han Su Lee),신동일(Dong Il Shin) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.1
Sediment transport around artificial habitat which is induced by the change of flow due to installation of the structure plays a role not only as a defect function of subsidence and burial but also bottom-environment control function. This study examined the characteristics of local scouring and deposition with sediment sizes, current velocities and installation direction of artificial habitat in flow field. Resultant subsidence and burial processes are investigated and discussed with Reynolds number. Together with sediment number and dimensionless time elapse, prediction formulas are established by combining these relationships. Bottom control function as cultivating effects is discussed with installation direction, and applicability of countermeasures is compared and stone pavement method is recommended.
연안해역의 기상 파랑관측망 설계 및 해석기술의 구축 - 해양파랑관측자료의 해석방법 -
류청로(Cheong Ro Ryu),김희준(Hee Joon Kim),손병규(Byung Kyu Shon) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.1
Application of digital filter to the wave analysis is studied using the observed data by wave gauge. Sea wave data obtained from wave gauge always include long wave frequency components. In order to estimate the sea wave parameters, we must re-analyzed wave data by using a digital filter and the concept of mean sea level correction method. By the wave by wave analysis and spectral methods, sea wave parameters on the basis of wave data obtained by the conventional method and digital filter are compared. The best-fitted design filter determined by the necessary conditions of frequency responses, can be obtained by calculating various transfer functions. Thus, to get the best the digital filter design, both Butterworth filter and Savitzky-Golay filter of digital filter are used in the frequency and time domain, respectively. Three cases of observation wave data are calculated by applying digital filter. The components of different frequency bands in the surf zone are coexisted in three cases. The wave data for wind wave components is computed using the digital filter in the surf cone and off-surf zone, and based on the filtered data, wave parameters are calculated by the spectral analysis and wave by wave analysis methods, respectively. As a results, when sea wave data observed by wave gauge are analyzed, the Savitzky-Golay method is recommended which can well appear cut-off frequency by experimental choosing filter length in the time domain. The better mean sea level correction method is the Butterworth filter in the frequency domain.
한국 연안의 극치 파랑환경과 Freak Wave의 특성에 관한 연구
류청로,윤홍주,박종화,김현주 한국환경과학회 1993 한국환경과학회지 Vol.2 No.3
Extreme environments and freak wave characteristics in the coastal waters of Korean Peninsula are analyzed using the observed wave data. Freak wave has been intensely emphasized as an important environmental force parameter in several recent research works. However, the mechanism and occurrence probability of freak wave are not clarified. The aims of this study are: to summarize the distribution of extreme environment for wind waves, and to find occurrence probability of freak wave in the coastal waters of Korean Peninsula. These extreme sea conditions are discussed by applying extreme value analysis method, and the statistic characteristics are summarized which can be used to the design and analysis of coastal structures. The mechanism and the occurrence probability of freak wave are also discussed in detail using wave parameters in considered with wave deformation in the coastal waters.