Research Papers: Ocean Engineering

Behavior of a Pontoon Supported by a Mooring Dolphin in a Tsunami (First Report)

[+] Author and Article Information
Mitsuhiro Masuda

Assistant Professor
Department of Maritime Systems Engineering,
Division of Marine Technology,
Tokyo University of Marine Science and Technology,
Tokyo, Japan
e-mail: masuda@kaiyodai.ac.jp

Koichi Masuda

e-mail: masuda.koichi@nihon-u.ac.jp

Tomoki Ikoma

e-mail: ikoma.tomoki@nihon-u.ac.jp
Department of Oceanic Architecture and Engineering,
CST, Nihon University Chiyoda,

Kuniaki Shoji

Japan Transport Safety Board
Tokyo, Japan
e-mail: shoji-k2kq@mlit.go.jp

1Corresponding author.

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the Journal of Offshore Mechanics and Arctic Engineering. Manuscript received November 18, 2011; final manuscript received September 28, 2012; published online February 25, 2013. Assoc. Editor: Ron Riggs.

J. Offshore Mech. Arct. Eng 135(2), 021102 (Feb 25, 2013) (7 pages) Paper No: OMAE-11-1102; doi: 10.1115/1.4023249 History: Received November 18, 2011; Revised September 28, 2012

In recent years, a number of floating facilities for the utilization of ocean space, such as a marine disaster prevention base, floating restaurant, or floating container terminal, are planned, and some of them are actually built. Most of these facilities are of the pontoon-type floating structure, and the mooring system is basically a mooring dolphin. In the design of such facilities, it is important that the prediction of the motions of a pontoon-type floating body, supported by a mooring dolphin, in a tsunami is obtained. The objective of the present research is to develop a simulation system to obtain such predictions. In the present simulation system developed here, the three-dimensional (3D) MPS method (moving particle semi-implicit method) is used, and a solitary wave and borelike wave are applied to represent the incoming tsunami wave. The present paper is a report of the first stage of the research, and the heaving motion of the floating body acted upon by the tsunami is paid special attention, and we also report on the results of the study of the detaching of the floating body from the mooring dolphin.

Copyright © 2013 by ASME
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Fig. 1

(a) Arrangement of the wave meter for measured the incident wave height. (b) Experimental setup system.

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Fig. 2

Coordinate system for floating washed onto the apron in numerical calculation

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Fig. 3

Comparison of the time history of the incident wave elevation

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Fig. 4

(a) Comparison of the maximum water elevation on the apron side at each point from H4 through H7. (b) Comparison of the time history of the water elevation at H4 on the apron. (c) Comparison of the time history of water elevation at H5 on the apron. (d) Comparison of the time history of water elevation at H6 on the apron. (e) Comparison of the time history of water elevation at H7 on the apron.

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Fig. 5

Comparison of the time history of dynamic pressure on the apron side

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Fig. 6

(a) Horizontal displacement of a floating vessel washed onto the apron by a tsunami. (b) Vertical displacement of a floating vessel washed onto the apron by a tsunami.

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Fig. 7

Snapshots of the experiment versus the MPS method

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Fig. 8

Comparison of the time history of the collision force (X = 0.3 m)

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Fig. 9

(a) Calculation setup system (x-y). (b) Calculation setup system (x-z).

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Fig. 10

(a) Incident wave elevation (solitary wave). (b) Horizontal displacement (solitary wave). (c) Vertical displacement (solitary wave). (d) Snapshots of calculations (solitary wave). (e) Snapshots of the detachment of the floating body (time = 48.0 s).

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Fig. 11

(a) Incident wave height (bore). (b) Horizontal displacement (bore). (c) Vertical displacement (bore). (d) Snapshots of the calculations (bore). (e) Snapshot of the detachment of the floating body (time = 70.0 s). (f) Snapshot of the detachment of the floating body (time = 82.0 s).




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