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The internal wave modal equations are solved with the consideration of background currents. Analytical and numerical solutions of some speci c examples, including observations in the northern South China Sea (SCS), are obtained to investigate the e ect of back- ground current on internal wave vertical structure. The e ects of current shear and curvature on internal wave vertical structure are eval- uated separately. It is found that the phase speed and wave structure are modi ed by background currents, the current shear has little e ect on wave structure, whilst the current curvature could have a strong impact on the wave structure. The extent of the e ect by the current curvature on the wave structure depends on the magnitudes of current curvature, relative wave speed, and buoyancy frequency, sometimes the e ect by the current curvature may even cause the wave to attenuate severely with depth. A new method to obtain the real eigenfunction with depth in the case that the waves become evanescent is also put forward. It is shown that the residual tidal current in the northern SCS is strong enough to cause the wave to attenuate severely at the upper layer.
The internal wave modal equations are solved with the consideration of background currents. Analytical and numerical solutions of some speci c examples, including observations in the northern South China Sea (SCS), are obtained to investigate the ect of back-ground current on internal The e ects of current shear and curvature on internal wave vertical structure are eval- uated separately. It is found that the phase speed and wave structure are modi ed by background currents, the current shear has little e ect on wave structure while the current curvature could have a strong impact on the wave structure. The extent of the e ect by the current curvature on the wave structure depends on the magnitudes of current curvature, relative wave speed, and buoyancy frequency, sometimes the e ect by the current curvature may even cause the wave to attenuate severely with depth. A new method to obtain the real eigenfunction with depth in the case that the waves become e It is shown that the residual tidal current in the northern SCS is strong enough to cause the wave to attenuate severely at the upper layer.