Experimental Study of Wave Attenuation in Trapezoidal Floating Breakwaters
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摘要
A comprehensive experimental study was carried out on the regular wave attenuation with a trapezoidal pontoontype floating breakwater(FB) in deep water. The functionalities of two simple FB geometries consist of a rectangle and a trapezoid with the slope of 60° were investigated under the wave attack. A two-dimensional wave flume was used in the experiment; the incident, transmitted waves, mooring line forces and motion responses of the floating breakwaters were measured. Also the influence of the sea state conditions(incident wave height and wave period)and structural parameters(draught of the structure) were investigated using the trapezoidal FB. Our experimental results indicated that the trapezoidal FB significantly reduced the wave transmission and mooring line force when compared with rectangular FBs. A new formula was developed in order to predict the value of the transmission coefficient in trapezoidal FBs with the slope of 60°. Experimental data showed to be consistent with the results of the formula.
A comprehensive experimental study was carried out on the regular wave attenuation with a trapezoidal pontoontype floating breakwater(FB) in deep water. The functionalities of two simple FB geometries consist of a rectangle and a trapezoid with the slope of 60° were investigated under the wave attack. A two-dimensional wave flume was used in the experiment; the incident, transmitted waves, mooring line forces and motion responses of the floating breakwaters were measured. Also the influence of the sea state conditions(incident wave height and wave period)and structural parameters(draught of the structure) were investigated using the trapezoidal FB. Our experimental results indicated that the trapezoidal FB significantly reduced the wave transmission and mooring line force when compared with rectangular FBs. A new formula was developed in order to predict the value of the transmission coefficient in trapezoidal FBs with the slope of 60°. Experimental data showed to be consistent with the results of the formula.
A comprehensive experimental study was carried out on the regular wave attenuation with a trapezoidal pontoontype floating breakwater(FB) in deep water. The functionalities of two simple FB geometries consist of a rectangle and a trapezoid with the slope of 60° were investigated under the wave attack. A two-dimensional wave flume was used in the experiment; the incident, transmitted waves, mooring line forces and motion responses of the floating breakwaters were measured. Also the influence of the sea state conditions(incident wave height and wave period)and structural parameters(draught of the structure) were investigated using the trapezoidal FB. Our experimental results indicated that the trapezoidal FB significantly reduced the wave transmission and mooring line force when compared with rectangular FBs. A new formula was developed in order to predict the value of the transmission coefficient in trapezoidal FBs with the slope of 60°. Experimental data showed to be consistent with the results of the formula.
引文
Abdolali,A.and Kolahdoozan,M.,2011.Comparison of analytical methods of wave decomposition for evaluating reflection coefficient,Journal of Marine Engineering,7(14),105-116.
Abdolali,A.,Franco,L.,Bellotti,G.and Kolahdoozan,M.,2012.Hydraulic and numerical modeling of the performance ofπ-type floating breakwaters,Proceeding of the 10th International Conference on Coasts,Ports and Marine Structures(ICOPMAS),Tehran,Iran.
Abul-Azm,A.G.and Gesraha,M.R.,2000.Approximation to the hydrodynamics of floating pontoons under oblique waves,Ocean Engineering,27(4),365-384.
Cheng,L.H.,Fen,C.Y.,Li,Y.H.and Jiang,W.Y.,2013.Experimental study on a new type floating breakwater,Proceedings of the 7th International Conference on Asian and Pacific Coasts,Hasanuddin University Press,Bali,Indonesia,Sep.24-26.
Drimer,N.,Agnon,Y.and Stiassnie,M.,1992.A simplified analytical model for a floating breakwater in water of finite depth,Applied Ocean Research,14(1),33-41.
Elchahal,G.,Younes,R.and Lafon,P.,2008.The effects of reflection coefficient of the harbour sidewall on the performance of floating breakwaters,Ocean Engineering,35(11-12),1102-1112.
Gesraha,M.R.,2006.Analysis ofπshaped floating breakwater in oblique waves:I.Impervious rigid wave boards,Applied Ocean Research,28(5),327-338.
Hales,L.Z.,1981.Floating Breakwater:State-of-the-Art,Literature Preview,Technical Report No.TR-81-1,U.S.Army Coastal Engineering Research Center,Fort Belvoir,VA.
He,F.,Huang,Z.H.and Adrian,W.K.L.,2012.Hydrodynamic performance of a rectangular floating breakwater with and without pneumatic chambers:An experimental study,Ocean Engineering,51,16-27.
Ji,C.Y.,Chen,X.,Cui,J.,Yuan,Z.M.and Incecik,A.,2015.Experimental study of a new type of floating breakwater,Ocean Engineering,105,295-303.
Koftis,T.and Prinos,P.,2005.Improved hydrodynamic efficiency of pontoon-type floating breakwaters,Proceedings of XXXI International Conference IAHR,IAHR,Seoul,Korea,4047-4056.
Koraima,A.S.and Rageh,O.S.,2013.Effect of under connected plates on the hydrodynamic efficiency of the floating breakwater,China Ocean Engineering,28(3),349-362.
Koutandos,E.V.,Karambas,T.V.,and Koutitas,C.G.,2004.Floating breakwater response to waves action using a Boussinesq model coupled with a 2DV elliptic solver,Journal of Waterway,Port,Coastal,and Ocean Engineering,130(5),243-255.
Mani,J.S.,1991.Design of Y-frame floating breakwater,Journal of Waterway,Port,Coastal,and Ocean Engineering,117(2),105-118.
Mansard,E.P.D.and Funke,E.R.,1980.The measurement of incident and reflected spectra using a least squares method,Proceedings of the 17th International Conference on Coastal Engineering,Sydney,Australia,154-172.
Moghim,M.N.and Botshekan,M.,2017.Analysis of the performance of Pontoon-type floating breakwaters,HKIE Transactions,24(1),9-16.
Murali,K.and Mani,J.S.,1997.Performance of cage floating breakwater,Journal of Waterway,Port,Coastal,and Ocean Engineering,123(4),172-179.
Pe?a,E.,Ferreras,J.and Sanchez-Tembleque,F.,2011.Experimental study on wave transmission coefficient,mooring lines and module connector forces with different designs of floating breakwaters,Ocean Engineering,38(10),1150-1160.
Sannasiraj,S.A.,Sundar,V.and Sundaravadivelu,R.,1998.Mooring forces and motion responses of pontoon-type floating breakwaters,Ocean Engineering,25(1),27-48.
Tang,H.J.,Huang,C.C.and Chen,W.M.,2011.Dynamics of dual pontoon floating structure for cage aquaculture in a two-dimensional numerical wave tank,Journal of Fluids and Structures,27(7),918-936.
Weng,W.K.and Chou,C.R.,2007.Analysis of responses of floating dual pontoon structure,China Ocean Engineering,21(1),91-104.
Williams,A.N.and Abul-Azm,A.G.,1997.Dual pontoon floating breakwater,Ocean Engineering,24(5),465-478.
Yao,G.Q.,Ma,Z.X.and Ding,B.C.,1993.Experimental study on rectangular floating breakwaters,China Ocean Engineering,7(3),323-332.
Abdolali,A.,Franco,L.,Bellotti,G.and Kolahdoozan,M.,2012.Hydraulic and numerical modeling of the performance ofπ-type floating breakwaters,Proceeding of the 10th International Conference on Coasts,Ports and Marine Structures(ICOPMAS),Tehran,Iran.
Abul-Azm,A.G.and Gesraha,M.R.,2000.Approximation to the hydrodynamics of floating pontoons under oblique waves,Ocean Engineering,27(4),365-384.
Cheng,L.H.,Fen,C.Y.,Li,Y.H.and Jiang,W.Y.,2013.Experimental study on a new type floating breakwater,Proceedings of the 7th International Conference on Asian and Pacific Coasts,Hasanuddin University Press,Bali,Indonesia,Sep.24-26.
Drimer,N.,Agnon,Y.and Stiassnie,M.,1992.A simplified analytical model for a floating breakwater in water of finite depth,Applied Ocean Research,14(1),33-41.
Elchahal,G.,Younes,R.and Lafon,P.,2008.The effects of reflection coefficient of the harbour sidewall on the performance of floating breakwaters,Ocean Engineering,35(11-12),1102-1112.
Gesraha,M.R.,2006.Analysis ofπshaped floating breakwater in oblique waves:I.Impervious rigid wave boards,Applied Ocean Research,28(5),327-338.
Hales,L.Z.,1981.Floating Breakwater:State-of-the-Art,Literature Preview,Technical Report No.TR-81-1,U.S.Army Coastal Engineering Research Center,Fort Belvoir,VA.
He,F.,Huang,Z.H.and Adrian,W.K.L.,2012.Hydrodynamic performance of a rectangular floating breakwater with and without pneumatic chambers:An experimental study,Ocean Engineering,51,16-27.
Ji,C.Y.,Chen,X.,Cui,J.,Yuan,Z.M.and Incecik,A.,2015.Experimental study of a new type of floating breakwater,Ocean Engineering,105,295-303.
Koftis,T.and Prinos,P.,2005.Improved hydrodynamic efficiency of pontoon-type floating breakwaters,Proceedings of XXXI International Conference IAHR,IAHR,Seoul,Korea,4047-4056.
Koraima,A.S.and Rageh,O.S.,2013.Effect of under connected plates on the hydrodynamic efficiency of the floating breakwater,China Ocean Engineering,28(3),349-362.
Koutandos,E.V.,Karambas,T.V.,and Koutitas,C.G.,2004.Floating breakwater response to waves action using a Boussinesq model coupled with a 2DV elliptic solver,Journal of Waterway,Port,Coastal,and Ocean Engineering,130(5),243-255.
Mani,J.S.,1991.Design of Y-frame floating breakwater,Journal of Waterway,Port,Coastal,and Ocean Engineering,117(2),105-118.
Mansard,E.P.D.and Funke,E.R.,1980.The measurement of incident and reflected spectra using a least squares method,Proceedings of the 17th International Conference on Coastal Engineering,Sydney,Australia,154-172.
Moghim,M.N.and Botshekan,M.,2017.Analysis of the performance of Pontoon-type floating breakwaters,HKIE Transactions,24(1),9-16.
Murali,K.and Mani,J.S.,1997.Performance of cage floating breakwater,Journal of Waterway,Port,Coastal,and Ocean Engineering,123(4),172-179.
Pe?a,E.,Ferreras,J.and Sanchez-Tembleque,F.,2011.Experimental study on wave transmission coefficient,mooring lines and module connector forces with different designs of floating breakwaters,Ocean Engineering,38(10),1150-1160.
Sannasiraj,S.A.,Sundar,V.and Sundaravadivelu,R.,1998.Mooring forces and motion responses of pontoon-type floating breakwaters,Ocean Engineering,25(1),27-48.
Tang,H.J.,Huang,C.C.and Chen,W.M.,2011.Dynamics of dual pontoon floating structure for cage aquaculture in a two-dimensional numerical wave tank,Journal of Fluids and Structures,27(7),918-936.
Weng,W.K.and Chou,C.R.,2007.Analysis of responses of floating dual pontoon structure,China Ocean Engineering,21(1),91-104.
Williams,A.N.and Abul-Azm,A.G.,1997.Dual pontoon floating breakwater,Ocean Engineering,24(5),465-478.
Yao,G.Q.,Ma,Z.X.and Ding,B.C.,1993.Experimental study on rectangular floating breakwaters,China Ocean Engineering,7(3),323-332.