• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.2
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• pp.394-405
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• 2022

This paper presents the numerical estimation results of oil outflows from damaged single-hull and double-hull ships by using computational fluid dynamics (CFD) simulations. A CFD method for multi-phase flow analysis was used, and the effects of numerical parameters on oil flows was investigated. Numerical simulations were conducted to predict the changes in oil outflows under various damage conditions owing to grounding or collision accidents and verified through available experimental results. The present numerical results showed a good agreement with the experimental results according to the geometrical characteristics of single and double hulls. In particular, the oil outflows from double hulls accompanying complex interactions between water and oil were reasonably predicted a shown in the experiment. This study established a reliable CFD technique necessary for estimating the oil outflows of damaged ships.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.402-403
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• 2010

Hebei Spirit Oil Spill in the West Coast in 2007 happened catastrophic environment and economy damage. Refer to the limitation of current oil spill response methods. and oil spill response in the Yellow sea coast of korea, effective measures are considered.

• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.4
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• pp.620-631
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• 2022

This paper shows the numerical prediction of the change in oil outflow rate according to the orifice shape of a damaged ship by using the computational fluid dynamics (CFD) analysis method. It also provides discharge coefficients for various orifice shapes to be used in theoretical prediction approaches. The oil outflow from the model ship was analyzed using a multiphase flow method under the condition that the Froude and Reynolds number similitudes were satisfied. The present numerical results were verified by comparing them with the available experimental data. Along with the aspect ratio of the orifice and the wall thickness of the cargo tank, the effects of the orifice shapes defined by mathematical figures on the oil outflow were investigated. To consider more realistic situations, the investigation of the ef ect of the crushed iron plate around the damaged part was also included. The numerical results confirmed the change in oil outflow time for various shapes of the damaged part of the oil tank, and discharge coefficients that quantify the viscous effects of those orifice shapes were extracted. To verify the predicted discharge coefficients, they were applied to an oil spill estimation equation. As a result, a good agreement between the CFD and theoretical results was obtained.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.291-292
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• 2011

우리나라 뿐만 아니라 미국 해양에서도 기름 유출사고가 발생하여 많은 생태계 피해가 있었으며, 앞으로도 발생할 가능성이 크다. 해수유동예측모델 실행 웹 포털은 기름 유출과 같은 해양사고에 빠르게 대응하기 위해 고안되었다. 한국과학기술정보연구원에서 제공하는 그리드 자원을 이용하여 신속한 관측자료 수집 및 입력자료 생성으로 해수흐름을 빠르고 정확하게 예측하기 위해 개발되었으며, 사고 발생 시 해수유동예측으로 오염물질의 경로 예측과 생태계 피해를 최소화하는데 기여하고자한다.

• Korean Journal of Remote Sensing
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• v.37 no.6_1
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• pp.1773-1784
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• 2021

In order to minimize damage to oil spill accidents in the ocean, it is essential to collect a spilled area as soon as possible. Thus satellite-based remote sensing is a powerful source to detect oil spills in the ocean. With the recent rapid increase in the number of available satellites, it has become possible to generate a status report of marine oil spills soon after the accident. In this study, the oil spill area was calculated using various satellite images for the Symphony oil spill accident that occurred off the coast of Qingdao Port, China, on April 27, 2021. In particular, improving the accuracy of oil spill area determination was applied using high-resolution commercial satellite images with a spatial resolution of 2m. Sentinel-1, Sentinel-2, LANDSAT-8, GEO-KOMPSAT-2B (GOCI-II) and Skysat satellite images were collected from April 27 to May 13, but five images were available considering the weather conditions. The spilled oil had spread northeastward, bound for coastal region of China. This trend was confirmed in the Skysat image and also similar to the movement prediction of oil particles from the accident location. From this result, the look-alike patch observed in the north area from the Sentinel-1A (2021.05.01) image was discriminated as a false alarm. Through the survey period, the spilled oil area tends to increase linearly after the accident. This study showed that high-resolution optical satellites can be used to calculate more accurately the distribution area of spilled oil and contribute to establishing efficient response strategies for oil spill accidents.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.06a
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• pp.23-24
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• 2009

허베이스피리트호 원유유출 사고는 2007년 12월7일 아침 7시6분경 서해안 만리포 북서쪽 10km 해상에서 크레인을 적재한 1만1800t급 바지선이 정박 중인 홍콩 선적 유조선 허베이 스피리트호(14만6000t급)와 부딪치면서 발생했다. 이와 같은 기름 유출 사고의 경우, 유출 범위를 정확하게 이해하는 것이 중요하다. 여기서는 위 사고 기간에 얻어진 인공위성 자료를 이용하여 기름 유출을 탐지하기 위한 연구결과를 소개한다. 광학과 마이크로파데이터에 대해 유출 범위의 계산 및 해석 알고리듬에 대한 현재까지의 결과를 소개한다. 광학데이터로는 아리랑 2호(다목적실용위성 2호, KOMPSAT II)) MSC(Multi Spectral Camera)자료가 사용되었으며, 합성개구레이더로는 ENVISAT ASAR, TerraSAR-X 및 ALOS PALSAR의 자료가 사용되었다.

• 해운
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• no.12 s.46
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• pp.11-19
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• 2007

다사다난했던 정해년(丁亥年)은 이제 노을 속으로 사라지고 곧 무자년(戊子年) 새해를 맞는다. 2007년 한해도 여느 때와 마찬 가지로 나라 안팎에서 크고 작은 사건이 끊이지 않았으며, 특히 해운부문에서도 예외없이 크고 작은 이슈들로 인해 희비가 교차되기도 했다. 특히, 부정기건화물선시황이 폭등하여 발틱운임지수(BDI)가 사상 최초로 1만포인트를 넘어섰는가 하면, 한해를 마무리하는 마지막달인 12월에는 서해안에서 대규모 기름유출사고가 발생하여 모든 이들의 가슴을 졸이게 했다. 다음은 2007년도 외항해운업계의 주요이슈를 정리한 것이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.29 no.1
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• pp.299-303
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• 2005

A new method of oil separation from oil-contaminated seawater based on electromagnetic forces, so-called MHD method was designed and formulated. MHD method has advantages of easy treatment of separated oil as well as little effect upon the environment, comparing with a conventional separation method using magnetic powders. Assuming high polymer particles instead of oil, the separation ratio (the mass of simulation particles / the total mass of simulation particles) for the sample fluid was calculated as fuction of electric current, magnetic field and seawater velocity.

• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.1
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• pp.61-65
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• 2012

Once oil has spilled, oil spill responders use a variety of countermeasures to reduce the adverse effects of spilled oil on the environment. Mechanical methods of containment and recovery are preferred as the first response when the use of other methods fail or are ineffective. In these cases, the application of oil dispersants shall be use only as a last resort. While effectiveness of dispersants in removing oil form the sea surface is proven, the use of dispersants is controlled in almost all countries due to the toxicity of their active agents and the dispersed oil on the marine environment. However, according to reports, after dispersant application, no significant toxicity to fish or shrimp was observed in the field-collected samples. Moreover, the results also indicate that dispersant-oil mixtures are generally no more toxic to the aquatic test species than oil alone. During the Deepwater Horizon Incident, dispersants were applied to floating oil and injected into the oil plume at depth. These decisions were carefully considered by state and federal agencies, as well as BP, to prevent as much oil as possible from reaching sensitive shoreline habitats. Net Environmental Benefit Analysis for dispersant use assumed that dispersants appear to prevent long-term contamination resulting absence of oil in the substrate and will benefit marine wildlife by decreasing the risk of significant contamination to feathers or fur. Further study to use dispersants with scientific baseline is needed for our maritime environment which consistently threaten huge oil spill incidents occurrence.

• 한국석유지질학회:학술대회논문집
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• autumn
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• pp.68-84
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• 1999

Biodegradation is a natural weathering process by microorganisms to decompose spilled oil or environmental contaminants. To accelerate this process, applying nutrients (fertilizer) or more microorganisms to naturally occurring microorganisms is called 'Bioremediation.' Presently, most popular response technique to spilled oil is mechanical cleanup using booms or skimmers. For the alternative to this technique, chemical dispersants, in-situ burning are used. Another promising alternative is bioremediation and it can clean oil contaminated seashore during enough time. In this paper, types of bioremediation technologies, its usage potential, and important consideration issues when applying this technique were summarized.