港湾内船舶の津波防災対策データベース構築に関する研究-津波対策係留索リストによる係留条件の評価-

抄録

Nankai Trough Earthquake with the large tsunami is concerned to occur currently. Tsunamis cause extensive damage to vessels in ports. In particular, breaking mooring lines is likely to lead to severe maritime disasters such as drifting, grounding and collision with other vessels or port facilities. Thus, it is important for mooring vessels in ports to prevent mooring lines from breaking due to tsunamis. However, few reports are available on the detailed mooring conditions needed for tsunami protection. In this study, we have proposed and developed “the tsunami protection measures mooring lines list” for vessels moored on wharves that indicates the mooring conditions such as material, diameter and the number of lines required to prevent mooring lines from breaking against tsunamis. The list is made by comparing two maximum mooring forces obtained from tsunami simulations using the 3D MPS method and static calculations. As a result, mooring conditions were evaluated for each tsunami height from this list, and it was indicated that a large increase in mooring forces is required for tsunami protection and that use of high-performance fiber lines such as HMPE lines and other measures which do not depend on only lines should be considered.