• Title/Summary/Keyword: 주묘

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VTS 해역에서 주묘 사례를 통한 주묘 위험성 판단 프로그램의 활용과 시스템 개선방안에 관한 연구

  • Im, Se-Uk;Ji, Min-Gu;Jeong, Chang-Hyeon;Kim, Ju-Seong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2019.11a
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    • pp.1-3
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    • 2019
  • 최근 선박의 대형화, 태풍 및 돌풍 등 급격한 자연환경의 변화, 한정된 정박지의 과밀 등으로 VTS 해역에서 선박 주묘가 자주 발생하고 있다. 선박의 주묘를 예측하기 위해서는 기상 조건에 의한 외력과 선박의 묘, 묘쇄 등 대항력의 정확한 비교, 현수부 및 파주부를 고려한 주묘 발생 가능 시점 예측 등의 노력이 요구된다. 본 연구에서는 VTS 관제 구역에서의 주묘 사고 사례 분석을 통하여 주묘 위험성 판단 프로그램을 검증하고, 관제 시스템에서 활용을 위한 시스템 개선 방안을 제안하고자 한다. 향후 관제 시스템의 주묘 위험성 판단 기능 도입을 통하여 주묘 사고의 예방 및 조기 대응이 가능할 것으로 기대한다.

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정박선 주묘판별 프로그램 개발에 관한 연구

  • Kim, Gwang-Il;Jeong, Jung-Sik;Park, Gye-Gak;Choe, Un-Seong;Kim, Wan-Uk;Lee, In-Beom
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2013.06a
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    • pp.371-373
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    • 2013
  • 정박중인 선박의 안전을 위하여 항해사 및 선장, 해상교통관제사(VTSO, Vessel Traffic Service Operator)는 수시로 선박이 주묘가 되는지 확인하여야 한다. 일반적으로 정박선의 주묘여부 판별은 선위측정에 의한 방법과 선체움직임을 감지하여 확인하는 방법이 있다. 하지만 VTSO는 실제 선박의 구체적인 정박상황 파악이 어려우므로 수신되는 위치정보를 바탕으로 주묘여부를 판별해야 한다. 본 연구는 VTS에서 AIS에 의해 수집되는 데이터를 활용하여 VTSO의 경험적 주묘여부 판별 알고리즘을 토대로 VTS에서 활용가능한 정박선 주묘판별 프로그램을 제시하고자 한다. 또한 구성된 프로그램을 완도주변해역에 적용하여 선박주묘여부를 판별하였다.

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Analysis on the Pattern of Dragging Anchor in Actual Ship (실선 계측에 의한 주묘패턴 분석에 관한 연구)

  • Jung, Chang-Hyun;Kong, Gil-Young;Bae, Byung-Deug;Lee, Yun-Sok
    • Journal of Navigation and Port Research
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    • v.33 no.8
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    • pp.505-511
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    • 2009
  • Vessels on anchoring are frequently dragged due to the increased area of wind pressure by enlargement of ship's size and sudden gust of winds in recent years. In the view point of the ship's navigators, the proper measurements corresponding to the dragging of anchor should be taken into account concerned about the time for the occurring of dragging by the external forces such as wind and wave, the pattern and speed of dragging and the possibility of collisions with any other vessels or obstacles. In this paper, it was examined the actual dragging anchor in T.S. HANBADA due to the wind and waves. From this case, it was found the critical external forces by which she was begun to dragged comparing the force by the wind, frictional resistance, drifting force and ship motion moment with the holding power. Also, through the analysis of the dragging pattern, it was known the alteration range of heading angle, swinging width and dragging speed etc.

The Development of the Anchor Dragging Risk Assessment Program (선박 주묘 위험성 판별 프로그램 개발에 관한 연구)

  • Kim, Joo-Sung;Park, Jun-Mo;Jung, Chang-Hyun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.6
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    • pp.646-653
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    • 2018
  • Marine accidents caused by dragging anchors occur constantly due to enlargement of ships' size and unusual weather conditions. Nevertheless, vessel operators rely on their experience because the calculations of actual holding power and external forces are complex and inconvenient. The purpose of this study was to propose a program for the anchor dragging risk assessment in order to provide crew and VTSO with the information to determine easily the danger of dragging and take appropriate action. The input data in this program were composed of the ship's basic particulars, anchoring condition, and external environment etc. on calculating for the wind pressure, frictional force, drift force, and holding power. Three dragging anchor accidents were applied to the program's data input at the time of the day, then the result was assessed by 'warning', which was verified with a high confidence. As a result, the risk of dragging anchors can be predicted in advance through this program. In further studies, it is necessary to simplify the input data and improve user convenience through automatic input from various equipment.

A Study on the Limit of Anchor Dragging for Ship at Anchor( II ) (묘박 중인 선박의 주묘 한계에 관한 연구( II ))

  • Bae, Suk-Han;Jung, Yun-Chul;Kim, Se-Won;Yun, Jong-Hwui;Lee, Yun-Sok;Nguyen, Phung-Hung
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.29 no.1
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    • pp.173-179
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    • 2005
  • In succession to previous study(A Study on the Limit of Anchor Dragging for Ship at Anchor sim I), the experiment of anchor dragging by ship handling simulator was performed to investigate the anchoring stability of ship at anchor in this study. The purpose of this experiment is to check the behavior charateristics of ship being dragged and the limit of anchor dragging for ship at anchor. A small tanker ship, which had been anchored in Jinhae Bay when the typhoon MAEMI passed on September 2003, was chosen as model ship for the experiment of anchor dragging and the result of experiment was confirmed to be very similar to the result of theoretical review and field report.

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Minimum Wind Speed of Dragging Anchor for Ships in Jinhae Bay Typhoon Refuge (진해만 태풍 피항 선박의 주묘 한계 풍속에 관한 연구)

  • Kang, Byung-Sun;Jung, Chang-Hyun;Park, Young-Soo;Kong, Gil-Young
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.27 no.4
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    • pp.474-482
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    • 2021
  • An average of two to three typhoons that occur in the Philippines or Taiwan pass through Korea each year owing to the influence of the geographical location and western winds. Because Jinhae Bay is known as Korea's representative typhoon refuge, it is filled with ships during typhoons and later becomes saturated with ships anchored to the surrounding routes. If a strong wind drags an anchored ship, a collision accident may occur because of the short distance between the ships. Therefore, a systematic anchoring safety management of Jinhae Bay is required. In this study, the minimum wind speeds of a dragging anchor based on the water depths of Jinhae Bay anchorages were investigated. When 7-9 shackles were given, the minimum wind speeds were 48-63, 46-61, and 39-54 knots at depths of 20, 35, and 50 m, respectively. As the water depth increased, the length of the cable laid on the sea bed became shorter than 5 m owing to the external force, and the minimum wind speed showed a significant difference of 4-8 knots. In addition, ships with high holding power anchors (AC-14 type) had higher minimum wind speeds than ships with conventional anchors (ASS type). Finally, it was confirmed that at a depth of 50 m, dragging easily occurred even when a high holding power anchor was applied.

A Study on the Holding Power Coefficient of AC-14 type and ASS type Anchor in Actual Ships (주묘 사례를 통한 AC-14형과 ASS형 앵커의 파주계수 비교에 관한 연구)

  • Jung, Chang-Hyun;Lee, Yun-Sok;Kim, Jong-Sung;Kong, Gil-Young
    • Journal of Navigation and Port Research
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    • v.35 no.8
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    • pp.613-618
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    • 2011
  • Vessels on anchoring are sometimes dragged due to the increased external forces. For preventing the dragging, it is required to enhance the holding power of the anchor. The holding power depends on the type and weight of the anchor and the seabed condition. Especially, the holding power of AC-14 type anchor is known to be 2~2.5 times bigger than that of ASS type anchor. However, these coefficients was determined nearly by the result of the model test, so there is a need to verify that by sea trial. Therefore actual dragging case was analyzed and then compared with the coefficients in use, it was found that the two of them are much alike.

관제구역내 환경변화에 따른 VTS의 대처방안

  • Jeong, Sun-Won;Park, Chan-Gil;Park, Yeong-Gil;Kim, Man-Sik;Kim, Bo-Gyeom;Jo, Yun-Gyeong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2015.07a
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    • pp.354-356
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    • 2015
  • 포항항 관제구역은 2009년 8월 영일만항 개장으로 방파제(길이 5.5km) 신설에 따라 정박지 'S-5'내 조류 및 저질변화로 인해 정박선의 주묘현상이 현저하게 발생하고 있으며, 포항 신항내 고층구조물 신설로 인해 동일 시간대 풍향 풍속등 기상현상이 포항구항 및 영일만항, 호미곶과는 달리 강력하게 발생하여 입 출항선박의 안전에 위험을 초래하고 있다. 이와 같이, 관제구역내 환경변화에 따른 정박선의 현저한 주묘 및 포항 신항내 강력한 풍향 풍속등의 발생이 선박의 안전을 위협하고 있다. 본 연구에서는 관제구역내 환경변화에 따른 해상교통안전의 위험을 줄이기 위한 VTS의 역할 및 대처방안에 대해 모색해 보고자 한다.

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