Motion responses of a moored barge in shallow water

Motion characteristics of a floating structure in shallow water are of great concern in ocean engineering. Shallow water effects will significantly affect the hydrodynamic performance of a floating structure. In this study, both numerical and experimental studies have been conducted to investigate the hydrodynamic performance of a barge in shallow water. Numerical simulations are conducted in both frequency and time domains based on 3D potential theory. Second-order wave forces have been incorporated in the numerical model through the calculation of fully quadratic transfer function. The numerical results are validated through a series of physical model tests, including free decay test and irregular wave tests. Responses of the floating structure in different water depths and sea states are studied to clarify the safe conditions for a float-over installation in shallow water. Based on the numerical and experimental results, some conclusions have been drawn. Furthermore, a critical depth for shallow water effects is clarified.

[1]  Jianmin Yang,et al.  An experimental investigation on wave runup along the broadside of a single point moored FPSO exposed to oblique waves , 2014 .

[2]  J. N. Newman.  Second-order, slowly-varying Forces on Vessels in Irregular Waves , 1974 .

[3]  Arcandra Tahar,et al.  Hull/mooring/riser coupled dynamic analysis and sensitivity study of a tanker-based FPSO , 2003 .

[4]  Olaf Waals,et al.  Review of Approximations to Evaluate Second-Order Low-Frequency Load , 2012 .

[5]  Nuno Fonseca,et al.  Investigation of depth effects on the wave exciting low frequency drift forces by different approximation methods , 2013 .

[6]  Jianmin Yang,et al.  Recent developments on the hydrodynamics of floating liquid natural gas (FLNG) , 2011 .

[7]  Ivo Wenneker,et al.  Time-domain calculation of moored ship motions in nonlinear waves , 2008 .

[8]  J. A. Pinkster.  Wave Drift Forces in Directional Seas in Shallow Water , 2009 .

[9]  Booki Kim,et al.  A Motion Analysis of Two Floaters in Shallow Water Using Boussinesq Equations , 2010 .

[10]  Jianmin Yang,et al.  Low-frequency drift forces and horizontal motions of a moored FPSO in bi-directional swell and wind-sea offshore West Africa , 2013 .

[11]  Monica J. Holboke,et al.  Shallow Water Effects On Low-Frequency Wave Excitation of Moored Ships , 2004 .

[12]  Xiaohong Chen.  APPROXIMATION ON THE QUADRATIC TRANSFER FUNCTION OF LOW-FREQUENCY LOADS , 1994 .

[13]  Mamoun Naciri,et al.  Design Aspects of SPM LNG Terminals in Shallow Water , 2004 .

[14]  Jianmin Yang,et al.  Motion Analysis On a Large FPSO In Shallow Water , 2003 .

[15]  Sa Young Hong,et al.  Numerical and experimental study on hydrodynamic interaction of side-by-side moored multiple vessels , 2003 .

[16]  Jinshu Lu,et al.  Fully Nonlinear Analysis On Responses of a Moored FPSO to Waves In Shallow Water , 2010 .

[17]  Yang Jianmin.  Review of the research on FPSO hydrodynamics , 2006 .

[18]  Jin-Ha Kim,et al.  An Experimental Study On the Response of FSRU In Shallow Water In Comparison of Mooring Systems , 2012 .

[19]  Harry B. Bingham,et al.  A hybrid Boussinesq-panel method for predicting the motion of a moored ship , 2000 .

[20]  Wenhua Zhao,et al.  Prediction of hydrodynamic performance of an FLNG system in side-by-side offloading operation , 2014 .

[21]  Xiaobo Chen,et al.  Middle-field formulation for the computation of wave-drift loads , 2007 .

[22]  Bernard Molin,et al.  Effect of wave-directionality on second-order loads induced by the set-down , 1984 .

[23]  Da Li,et al.  Scenario Research and Design of FPSO in South China Sea , 2014 .

[24]  Tim Bunnik,et al.  Low Frequency Motions of LNG Carriers Moored in Shallow Water , 2004 .

[25]  J. A. Pinkster,et al.  LOW-FREQUENCY PHENOMENA ASSOCIATED WITH VESSELS MOORED AT SEA , 1975 .