Novel safety evaluation technique for ships in offshore anchorage under rough seas conditions for optimal ship routing

Sang Won Lee, Kenji Sasa, Chen Chen, Kurniawan T. Waskito, Ik Soon Cho

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

In recent years, the number of waiting ships in offshore anchorage has increased owing to several reasons, such as the port lockdown and increased cargo volumes in maritime transportations. Moreover, port terminals have ordered ships to stay outside the harbor to prevent mooring accidents when rough waves are forecasted. Anchored ships have been exposed to dangers owing to dragging anchors under rough sea conditions, especially those facing the open seas. In this study, we perform a numerical simulation of anchored ship motions to reproduce the dragging anchor. Additionally, we further evaluated the anchored ship motions based on underestimated wave conditions. Lastly, we constructed a novel risk assessment technique for anchored ships to assess the stranding risk, damage to marine structures, and risk of collision. The stranding risk was evaluated based on the relationship between the vertical displacement and Under Keel Clearance (UKC). Damaging risk can be identified from the information of harbor charts. The risk of collision was quantitatively assessed considering the main influential factors such as Closest Point of Approach (CPA), and the Ship Domain Overlapping Index (SDOI). Results showed that the proposed methodology can contribute to port safety and ship operation in terms of optimal ship routing.

Original languageEnglish
Article number111323
JournalOcean Engineering
Volume253
DOIs
Publication statusPublished - 1 Jun 2022

Keywords

  • Anchored ship motions
  • Dragging anchor
  • Offshore anchorage
  • Optimal ship routing
  • Weather forecasting

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