• 제목/요약/키워드: Coastal ocean

검색결과 4,469건 처리시간 0.024초

외항선사(外航船社)의 수출입(輸出入) 컨테이너 내항운송(內航運送) 허용(許容)에 따른 문제점(問題點)과 내항해운(內航海運)의 육성방안(育成方案) (Permission of Costal Carriage of Import-Export Containers by Ocean Liner Carriers and Growth Plan of Costal Shipping Industry)

  • 하영석;정근존
    • 무역상무연구
    • /
    • 제19권
    • /
    • pp.96-118
    • /
    • 2003
  • Government tries to revise the article 25 in Korea Maritime Transport Act which describes subject of coastal carriage for exported-imported container cargoes. The subject of coastal carriage will be replaced coastal carrier by ocean liner carrier according to the revised article 25. By adopting the revised article, coastal shipping industry will be deteriorated in terms of returns on investment, sales and etc. Even though the revision is inevitable to harmonize the flow of exported-imported container cargo movement, coastal shipping industry should be developed and restructured to get competitive power and to set up an efficient international logistics system. To enhance competitive power of coastal shipping companies successfully, government must realize the importance of coastal shipping, and aid the industry through various methods such as arrangement of law and regulation, indirected financial assistance, decrease of tax rate, etc.

  • PDF

TIME-DEPENDENT WAVE EQUATIONS ON BOTTOM WITH SUBSTANTIAL DEPTH VARIATION

  • Suh, Kyung-Duck;Lee, Changhoon
    • 한국해안해양공학회:학술대회논문집
    • /
    • 한국해안해양공학회 1995년도 정기학술강연회 발표논문 초록집
    • /
    • pp.75-80
    • /
    • 1995
  • The model for the combined refraction and diffraction of water waves, the so-called mild-slope equation, was first developed by Berkhoff (1972) and has been studied by many coastal engineers because the model is able to consider the combined effect of refraction and diffraction of water waves and eliminate the problem of ray crossing which may happen in the previously developed ray theory. (omitted)

  • PDF

Sea Environmental Design Criteria for Coastal and Offshore Structures

  • Liu, Defu
    • 한국해안해양공학회:학술대회논문집
    • /
    • 한국해안해양공학회 1996년도 정기학술강연회 발표논문 초록집
    • /
    • pp.19-22
    • /
    • 1996
  • Extreme sea statistics and combinations of environmental events or response for structures are very important problem in performance evaluation and design of coastal and Offshore structures. A probabilistic method is developed that leads to the combination of Typhoon (Hurricane) or winter storm induces winds, waves, currents and surge for a generic site. The traditional recommendation for the fixed structures is a combination of the 100 years maximum wave height with the 100 years wind and current. (omitted)

  • PDF

단일 및 이중유수실 유공케이슨 방파제에 작용하는 최대 수평파력 비교 (Comparison of Maximum Horizontal Wave Force Acting on Perforated Caisson Breakwater with Single and Double Chamber)

  • 오상호;지창환;오영민;장세철;이달수
    • 한국해안·해양공학회논문집
    • /
    • 제26권5호
    • /
    • pp.335-341
    • /
    • 2014
  • 이 연구에서는 단면 수리모형실험을 통해 파의 여러 위상에 따라 단일 및 이중유수실 유공케이슨 방파제의 연직벽에 작용하는 최대 수평파력을 계측하고 그 크기를 서로 비교하였다. 본 실험 자료 분석 결과 이중유수실 케이슨의 유수실 전체 폭이 단일유수실의 폭과 동일한 경우 이중유수실 케이슨에 작용하는 총 수평파력이 평균적으로 9.6% 작은 것으로 나타났다. 이러한 파력 저감 효과는 이중유수실 케이슨 방파제의 유공 전면벽과 무공 후면벽 사이에 위치한 유공 중간벽에서 파 에너지가 소산되기 때문인 것으로 파악되었다.

해저 표준관입시험 장비의 밀폐형 항타부 CFD 해석 (CFD Analysis of Underwater Standard Penetration Test Equipment)

  • 고진환;장인성;김우태;권오순;백원대
    • 한국해양공학회지
    • /
    • 제26권6호
    • /
    • pp.33-38
    • /
    • 2012
  • In our study, a closed-type penetration unit for standard penetration test (SPT) equipment was developed in order to operate in an underwater environment. This type causes energy dissipation, mainly due to the small gap between an airtight case and moving hammer. The dissipation was estimated through a CFD analysis. The computed dissipated energy was less than 1.2% compared to the potential energy of the hammer with the given gap. Subsequently, the impact energy of the underwater SPT equipment was within 1.2% of that for the SPT equipment on land.