三层成层水域内波的研究

运用小振幅波理论对三层成层水域内波运动进行了解析，阐明了三层成层状态下的流速垂直分布和内波波动分散规律，并与大阪湾观测到的内波列取得良好吻合，解析还表明，三层成层水域流速的大小与内波引起各层间的流量分配密切相关，最大振幅水深由水域的成层特点所决定，小流速时的内波界面变位和流况与二层成层的情形呈形完全相反的结果，了解三层成层水域内波的这些特性对于正确认识养殖水域的环境特点及变动，合理设置水产增养殖设

STUDY ON INTERNAL WAVE IN THREE-LAYER STRATIFIED FLUID

Motion of internal wave in three-layer stratified fluid is analyzed by small amplitude wave theory in this paper. Patterns of vertical distribution in velocity due to the wave and its dispersion relationship are discovered, and they fully agree with some characteristics of the internal wave obsered at the field of Osaka Bay. Also, the analyzed results show that velocity of flow is related to rate of discharge in each layer due to the wave, and depth of maximum amplitude depends on state of stratification. Morever, it is found that there are two dilferent modes of velocity in three-layer stratified fluid, interfacial phase and direction of the wave with smaller mode are contrary to case of two-layer stratified fluid. These characteristics of the internal wave in three-layer stratified fluid will be helpful to estimate water environments and to select sultable underwater depth for facilities of aquaculture.