A Time Domain Analysis of Moored Ship Motions with Resonant Period of a Tsunami

Cho, Ik-Soon; Lee, Yun-Sok; Lee, Choong-Ro

Journal of Navigation and Port Research 2006;30(6):433-438.
Published online August 30, 2006.

쓰나미의 공진주기파를 고려한 항내 계류선박의 시계열 해석

조익순, 이윤석, 이충로

A Time Domain Analysis of Moored Ship Motions with Resonant Period of a Tsunami

Ik-Soon Cho, Yun-Sok Lee, Choong-Ro Lee

Abstract

Recently, the earth scale disaster ís occurring frequently. Under the effects of global warming, the weather has become unseasonable worldwide. Hence, the earth is experiencing unstable condition with many disasters such as storms and flood damages as well as earthquake. Therefore, it is necessary to consider what we can do to prevent disasters. Consequently, recent warnings indicate that there ís a potential risk of massive earthquakes. Consideration of the effects of tsunami to the moored ship is very important. Operational problems such as moored ship motions sometimes become remarkable wíth large amplitude and long periods in harbor. Moored ship motions may cause the breakage of mooring systems such as mooring lines, fenders or quay. Large and long period moored ship motions are caused by resonant effects. In thís paper, the moored ship motíons wíthin a harbor by the large-scale tsunami and the effects on the motions and mooring loads with resonant effects are investigated by numerical simulations.

Key Words: Tsunami;Resonant period;Moored ship motion in harbor;Time domain analysis