Keywords
harbor resonance
Pohang New Harbor
How to Cite
Abstract
This paper proposes a computational method for estimating moored ship motion taking into consideration harbor resonance, and provides a way to estimate the effect that harbor resonance has on moored ship motion. The computation of harbor resonance used the CGWAVE model, and the computation of moored ship motion used the three-dimensional Green's function method. This method was verified with field motion measurement data from actual moored ships and wave field data and down time record data from Pohang New Harbor. The resonance periods obtained from wave field data in Pohang New Harbor were 80, 33, 23, and 8 min, which were the long waves, and 42, 54, and 60 s, which were the infra-gravity waves inside the harbor slip. The simulation results for harbor resonance were compared to the actual wave field data. This study investigated whether harbor resonance has an effect on moored ship motion using simulated results of ship motion both with and without harbor resonance included. In the case of harbor resonance included, moored ship motion increased by 10-30% when compared with the results without harbor resonance included. We found that harbor resonance has a greater effect on the surge and heave motion of a large-sized ship and on the roll and the yaw motion of a small-sized ship.References
Dally, W. R., Dean, R. G., and Dalrymple, R. A. 1985. Wave Height Variation Across Beaches of Arbitrary Profile, J. of Geophysical Research, Vol 90, No. C6, 11917-11927.http://dx.doi.org/10.1029/JC090iC06p11917">http://dx.doi.org/10.1029/JC090iC06p11917
Dalrymple, R. A., Kirby, J. T., and Hwang, P. A. 1984. Wave Diffraction due to areas of high energy dissipation, J. Waterway, Port, Coastal and Ocean Eng., 110, 67-79.http://dx.doi.org/10.1061/(ASCE)0733-950X(1984)110:1(67)">http://dx.doi.org/10.1061/(ASCE)0733-950X(1984)110:1(67)
Demirbilek, Z., 1994. Comparison Between REFDIFS and CERC Shoal Laboratory Study, Unpublished Report, Waterways Exp. Station, Vicksburg, MS, 53.
Demirbilek, Z., Xu, B. and Panchang, V. 1996. Uncertainties in the Validation of Harbor Wave Models, Proceedings of 25th ICCE, 1256-1267.
Demirbilek, Z., and Panchang, V. 1998. CGWAVE : A Coastal Surface Water Wave Model of the Mild Slope Equation. Technical Report CHL-98-xx, U.S. Army Corps of Engineer, PP. 6-11.
Kirby, J. T. and R. A. Dalrymple, 1986. Modeling Waves in Surfzones and Around Islands, J. of Waterway, Port, Coastal and Ocean Engineering, ASCE, 112(1), 78-93.http://dx.doi.org/10.1061/(ASCE)0733-950X(1986)112:1(78)">http://dx.doi.org/10.1061/(ASCE)0733-950X(1986)112:1(78)
Madsen, O.S. 1976. Wave Climate of the Continental Margin: Elements of its Mathematical Description, Marine Sediment Transport and Environmental Management (eds. D. Stanley and D.J.P. Swift), John Wiley, New York, 65-87.
PMid:953243
Molen, W., H. Ligteringen, J. C. vander Lem, J. C. M. de Waal, 2003, Behavior of a Moored LNG Ship in Swell Waves. J. of Waterway, Port, Coastal, and Ocean Engineering, ASCE, 129(1), 15-21.
Sakakibara, S., K. Saito and M. Kubo 2001. A study on Long-Period Ship Motions in a Harbor Induced by a Resonant Large Roll Motion Under Long-Period Waves, Proceedings of ISOPE, 326-333.
Ueda, S. and S. Shiraisi. 1988. The allowable ship motions for cargo handling at wharves. 27(4), Report of port and harbour research. Inst., Japan, 3-61. Masayoshi Kubo, Shigeki Sakakibara, Katsuhiko Saito. 2001, A study on Long-Period Moored Ship Motions in a Harbor Induced by Resonant Large Roll Motion Under Long-Period Waves, Proceedings of ICCE, 326~333.