双浮箱与不同形式板组合的浮堤消浪性能试验
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摘要
对双浮箱与不同形式板组合的浮堤进行二维水槽波浪物理模型试验,探讨水平板入水深度、水平板开孔率、多孔竖直板等因素对浮式防波堤消浪性能的影响,重点分析双浮箱与多孔竖直板组合的浮堤的消浪性能和消浪机理。结果表明,对于双浮箱与水平板组合的浮堤,整体上水平板开孔时的消浪效果优于水平板不开孔时,尤其在波浪周期较长时。随着水平板入水深度的增大,浮堤的波浪透射系数明显减小、消浪效果明显改善,但整体上较双浮箱间无板时,其消浪性能仍无明显提高。与双浮箱间无板时相比,双浮箱间设置多孔竖直板时新型浮堤的波浪透射系数均减小,浮堤的消浪效果均得到明显改善。与双浮箱间无板时相比,双浮箱间设置多孔竖直板时新型浮堤的波浪反射系数均减小、波能损耗系数均增大。双浮箱间设置多孔竖直板时浮堤消浪效果改善的主要原因是双浮箱间的多孔竖直板增强了浮堤的波能损耗。
In this paper,we study the floating breakwater composed of two pontoons and different types of plates by the 2D model tests,discuss the influence of the horizontal plates and vertical plates on the wave attenuation performance,and analyze wave attenuation performance and mechanism of the floating breakwater composed of two pontoons and the horizontal plates.The results show that for the floating breakwater composed of two pontoons and the horizontal plates,the wave attenuation performance of the slotted horizontal plates is better as a whole,especially for conditions of relatively long wave periods. The wave transmission coefficients decrease significantly and the wave attenuation performance improves significantly with the increase of the depth of the horizontal plates under water.However,compared to the twin-pontoon floating breakwater without plates,the wave attenuation performance of the floating breakwater with the horizontal plates still doesn't improve significantly as a whole. Compared to the twin-pontoon floating breakwater without plates,the wave transmission coefficients of the new floating breakwater with the porous vertical plates decrease significantly,and the wave attenuation performance increase significantly.Compared to the twin-pontoon floating breakwater without plates,the wave reflection coefficients of the new floating breakwater with the porous vertical plates all decrease and the wave energy damping coefficients all increase.The main reason for the improvement of the wave attenuation performance of the new floating breakwater with the porous vertical plates is that the porous vertical plates between the two pontoons can enhance the wave energy damping significantly.
In this paper,we study the floating breakwater composed of two pontoons and different types of plates by the 2D model tests,discuss the influence of the horizontal plates and vertical plates on the wave attenuation performance,and analyze wave attenuation performance and mechanism of the floating breakwater composed of two pontoons and the horizontal plates.The results show that for the floating breakwater composed of two pontoons and the horizontal plates,the wave attenuation performance of the slotted horizontal plates is better as a whole,especially for conditions of relatively long wave periods. The wave transmission coefficients decrease significantly and the wave attenuation performance improves significantly with the increase of the depth of the horizontal plates under water.However,compared to the twin-pontoon floating breakwater without plates,the wave attenuation performance of the floating breakwater with the horizontal plates still doesn't improve significantly as a whole. Compared to the twin-pontoon floating breakwater without plates,the wave transmission coefficients of the new floating breakwater with the porous vertical plates decrease significantly,and the wave attenuation performance increase significantly.Compared to the twin-pontoon floating breakwater without plates,the wave reflection coefficients of the new floating breakwater with the porous vertical plates all decrease and the wave energy damping coefficients all increase.The main reason for the improvement of the wave attenuation performance of the new floating breakwater with the porous vertical plates is that the porous vertical plates between the two pontoons can enhance the wave energy damping significantly.
引文
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[8]董华洋.浮箱-水平板式浮防波堤水动力特性研究[D].大连:大连理工大学,2009.
[9]杨彪,陈智杰,王国玉,等.双浮箱-双水平板式浮式防波堤试验研究[J].水动力学研究与进展(A辑),2014,29(1):40-49.
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[11]MANI J S.Design of y-frame floating breakwater[J].Journal of waterway,port,coastal and ocean engineering,1991,117(2):105-119.
[12]MURALI K,MANI J S.Performance of cage floating breakwater[J].Journal of waterway,port,coastal and ocean engineering,1997,123(4):172-179.
[13]MICHAEL W,HERMANSON.Physical modeling of a floating breakwater with a membrane[D].Florida:University of Florida,2003.
[14]MANSARD E P D,FUNKE E R.The measurement of incident and reflected spectra using a least squares method[C]//ASCE.The 17th International Conference on Coastal Engineering,Australia:[s.n.],1980:154-172.
[2]王永学,王国玉.近岸浮式防波堤结构的研究进展与工程应用[J].中国造船,2002,43(S1):314-321.
[3]ARIE C B.Effectiveness of floating breakwaters[D].Delft:Delft University of Technology,2013.
[4]沈雨生,周益人,潘军宁,等.浮式防波堤研究进展[J].水利水运工程学报,2016(5):124-132.
[5]CHRISTIAN C D.Floating breakwater for small boat marina protection[C]//ASCE.Proceedings of the 27th International Conference on Coastal Engineering,Australia:[s.n.],2000:2268-2277.
[6]GESRAHA M R.Analysis ofПshaped floating breakwater in oblique waves[J].Applied ocean research,2006,28(5):327-338.
[7]KORIAM A S,RAGEH O S.Effect of under connected plates on the hydrodynamic efficiency of the floating breakwater[J].China ocean engineering,2014,28(3):349-362.
[8]董华洋.浮箱-水平板式浮防波堤水动力特性研究[D].大连:大连理工大学,2009.
[9]杨彪,陈智杰,王国玉,等.双浮箱-双水平板式浮式防波堤试验研究[J].水动力学研究与进展(A辑),2014,29(1):40-49.
[10]ALLYN N,WATCHORN E,JAMIESON W,et al.Port of brownsville floating breakwater[C]//ASCE.Proceedings of Ports Conference 2001,America:[s.n.],2001:1-10.
[11]MANI J S.Design of y-frame floating breakwater[J].Journal of waterway,port,coastal and ocean engineering,1991,117(2):105-119.
[12]MURALI K,MANI J S.Performance of cage floating breakwater[J].Journal of waterway,port,coastal and ocean engineering,1997,123(4):172-179.
[13]MICHAEL W,HERMANSON.Physical modeling of a floating breakwater with a membrane[D].Florida:University of Florida,2003.
[14]MANSARD E P D,FUNKE E R.The measurement of incident and reflected spectra using a least squares method[C]//ASCE.The 17th International Conference on Coastal Engineering,Australia:[s.n.],1980:154-172.