Energy Dissipation and Velocity Distribution of Internal Soliton Encountering Submerged Triangular Obstacle
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摘要: 为了观察内波受海脊地形影响的演化及运动机制,进行了实验室试验.研究表明,海脊地形对内波的影响可以划分为轻微影响、中度影响和强烈影响(波形破碎)3种程度,无因次障碍参数是划分内波与障碍物交互作用的重要依据——当无因次障碍参数小于0.5时,为轻微影响;介于0.5~0.7之间时,为中度影响;大于0.7时,为强烈影响,将使内波产生明显的破碎现象.随无因次障碍参数的增大,无因次波速减小,而内波的能量消散增大.Abstract: Internal solitary wave(ISW) propagation is influenced by some physical factors.The most important factor of all is topography seabed in the ocean.Due to difficulties in field investigation,a wave flume was produced and tests were carried out to observe ISW propagation in the laboratory.The research shows that the classification of wave-ridge encounter can be divided into weak interaction,moderate interaction and strong interaction,and that a non-dimensional blockage parameter may be applied efficiently to determine the classification of wave-ridge encounter,being below 0.5 for the weak interaction,0.5 to 0.7 for the moderate interaction and over 0.7 for the strong interaction.Furthermore,the non-dimensional propagation speed of an ISW declines and the dissipation of wave energy increases as the blockage parameter increases.
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KAO T W,PAN F S,RENOUARD D.Internal solitons on the pycnocline:generation,propagation,shoaling and breaking over a slope[J].J.Fluid Mech.,1985,159:19-53.[2] HELFRICH K R,MELVILLE W K.On long nonlinear internal waves over slope-shelf topography[J].J.Fluid Mech.,1986,167:285-308.[3] MICHALLET H,IVEY G N.Experiments on mixing due to internal solitary waves breaking on uniform slopes[J].J.Geophys Res.,1999,104(C6):13 467-13 477.[4] HSU J R C,ARIYARATNAM J.Pressure fluctuations and a mechanism for sediment suspension in swash zone[J].Proc.27th Inter.Conf.on Coastal Eng.,2000,1:610-623.[5] WESSELS F,HUTTER K.Interaction of internal waves with a topographic sill in a two-layered fluid[J].J.Phys.Oceanogr.,1996,26 (1):5-20.[6] KUO C F,HSU J R C,CHEN C Y,et al.Interaction between an internal wave and isolated bump[J].Proc.27th Conf.on Ocean Eng.,2005,26:162-168.[7] MICHALLET H,BARTHELEMY E.Ultrasonic probes and data processing to study interfacial solitary waves[J].Exp.Fluid,1997,22:380-386. -
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