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以南中国海东北部海域底部缓坡地形为背景,在大型重力式分层流水槽中模拟了下凹型内孤立波沿缓坡地形传播过程中的浅化、破碎、分裂等现象,利用分层染色标识方法和多点组合探头阵列技术对内孤立波沿缓坡地形演化特征进行了定性分析和定量测量.实验表明:浅化效应使内孤立波传播速度减小,对大振幅内孤立波具有抑制作用,对小振幅波具有放大效应;浅化效应可导致内孤立波的剪切失稳及破碎,还可导致大振幅内孤立波的分裂.利用Miles稳定性理论可定性描述内孤立波沿缓坡地形传播时发生不稳定状态的位置,实验结果与理论分析相符合.
Based on the gentle slope topography at the bottom of sea area in the northern part of the sea in the southeastern part of China, the phenomena of shallowing, crushing and splitting of the concave inner solitary wave along the gentle slope terrain were simulated in large gravity stratified flume. Method and multi-point combined probe array technology were used to qualitatively analyze and quantitatively measure the evolution of internal solitary waves along the gentle slope.The results show that shallowing effect reduces the inner solitary wave propagation velocity and restrains the solitary wave with large amplitude, Which has the amplification effect on small amplitude waves. The shallowing effect can lead to the shear instability and fragmentation of the internal solitary wave, and can lead to the splitting of the solitary wave in the large amplitude. By using Miles stability theory, When unstable position occurs, the experimental results are consistent with the theoretical analysis.