Cause and countermeasure of long-period oscillations of moored ships and the quantification of surge and heave amplitudes |
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| Authors: | Ken-ichi Uzaki Nobuhiro Matsunaga Yasuhiro Nishii Yoshito Ikehata |
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| Institution: | 1. Port and Airport Research Institute, Nagase 3-1-1, Yokosuka, Kanagawa 239-0826, Japan;2. Department of Earth System Science and Technology, Kyushu University, Kasuga-koen 6-1, Kasuga, Fukuoka 816-8580, Japan;3. Research Section, Sanyo Consultants Co., Ltd., Kyomachi 3-14-7, Kokurakita, Kitakyushu, Fukuoka 802-8534, Japan;4. Department of Civil Engineering, Faculty of Engineering, 1727 Ichigi, Oita, Oita 870-0397, Japan |
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| Abstract: | Long-period oscillations of moored ships whose periods are about 1 or 2 min cause many troubles in many ports and harbours. It is necessary to investigate these phenomena and verify their causes and countermeasures in each case because they are strongly dependent on the environment of each port and harbour. From this point of view, long-period oscillations of moored ships in the Port of Shibushi in Japan were investigated by means of wave observations, the image processing of moored ship motions using the video camera and motion-capture software and numerical simulations. From observation results, the relationship between offshore long-period waves and long-period oscillations of moored ships was recognized and surge and heave amplitudes were quantified by using wave data in order to forecast moored ship motions. Furthermore, from observation and numerical results, it was revealed that long-period waves with the peak period of 120 s from the offshore typhoon kept or exaggerated the local harbour oscillation of 60–70 s and it caused long-period oscillations of moored ships. Numerical results in case of reducing the reflection coefficient of the target berth implied that it ceased the local harbour oscillation and it would give an effective countermeasure to reduce long-period oscillations of moored ships in the Port of Shibushi. |
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