scholarly journals Deep-water internal solitary waves near critical density ratio

2007 ◽  
Vol 225 (2) ◽  
pp. 153-168 ◽  
Author(s):  
D.S. Agafontsev ◽  
F. Dias ◽  
E.A. Kuznetsov
Keyword(s):  
Solitary Waves ◽  
Deep Water ◽  
Density Ratio ◽  
Critical Density ◽  
Internal Solitary Waves

Internal solitary waves induced deep-water nepheloid layers and seafloor geomorphic changes on the continental slope of the northern South China Sea

2021 ◽  
Vol 33 (5) ◽  
pp. 053312
Author(s):  
Zhuangcai Tian ◽  
Yonggang Jia ◽  
Jiangxin Chen ◽  
J. Paul Liu ◽  
Shaotong Zhang ◽  
...  
Keyword(s):  
South China Sea ◽  
Continental Slope ◽  
Solitary Waves ◽  
South China ◽  
Deep Water ◽  
Northern South China Sea ◽  
Internal Solitary Waves ◽  
China Sea

scholarly journals Energetics of internal solitary waves in a background sheared current

2010 ◽  
Vol 17 (5) ◽  
pp. 553-568 ◽  
Author(s):  
K. G. Lamb
Keyword(s):  
Solitary Wave ◽  
Surface Waves ◽  
Solitary Waves ◽  
Deep Water ◽  
Pressure Change ◽  
Boussinesq Approximation ◽  
Internal Solitary Wave ◽  
Internal Solitary Waves ◽  
Deep Basin ◽  
Internal Seiche

Abstract. The energetics of internal waves in the presence of a background sheared current is explored via numerical simulations for four different situations based on oceanographic conditions: the nonlinear interaction of two internal solitary waves; an internal solitary wave shoaling through a turning point; internal solitary wave reflection from a sloping boundary and a deep-water internal seiche trapped in a deep basin. In the simulations with variable water depth using the Boussinesq approximation the combination of a background sheared current, bathymetry and a rigid lid results in a change in the total energy of the system due to the work done by a pressure change that is established across the domain. A final simulation of the deep-water internal seiche in which the Boussinesq approximation is not invoked and a diffuse air-water interface is added to the system results in the energy remaining constant because the generation of surface waves prevents the establishment of a net pressure increase across the domain. The difference in the perturbation energy in the Boussinesq and non-Boussinesq simulations is accounted for by the surface waves.

scholarly journals Observations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method

2021 ◽  
Vol 8 ◽  
Author(s):  
Haibin Song ◽  
Yi Gong ◽  
Shengxiong Yang ◽  
Yongxian Guan
Keyword(s):  
Fine Structure ◽  
Solitary Wave ◽  
Phase Velocity ◽  
Shallow Water ◽  
Solitary Waves ◽  
Deep Water ◽  
Internal Solitary Wave ◽  
Internal Solitary Waves ◽  
Structure Changes ◽  
Different Depths

High spatial resolution and deep detection depths of seismic reflection surveying are conducive to studying the fine structure of the internal solitary wave. However, seismic images are instantaneous, which are not conducive to observing kinematic processes of the internal solitary waves. We improved the scheme of seismic data processing and used common-offset gathers to continuously image the same location. In this way, we can observe internal fine structure changes during the movement of the internal solitary waves, especially the part in contact with the seafloor. We observed a first-mode depression internal solitary wave on the continental slope near the Dongsha Atoll of the South China Sea and short-term shoaling processes of the internal solitary wave by using our improved method. We found that the change in shape of waveform varies at different depths. We separately analyzed the evolution of the six waveforms at different depths. The results showed that the waveform in deep water deforms before that in shallow water and the waveform in shallow water deforms to a greater degree. We measured four parameters of the six waveforms during the shoaling including phase velocity, amplitude, wavelength, and slopes of leading and trailing edge. The phase velocity and amplitudes of waveforms in shallow water increase, the wavelengths decrease, and the slopes of trailing edge gradually become larger than that of the leading edge, while the amplitudes of the deep water waveforms do not change significantly and the phase velocities decrease. Our results are consistent with previous studies made by numerical simulations, which suggest the effectiveness of the new processing scheme. This improved scheme cannot only study the internal solitary waves shoaling, but also has great potential in the study of other ocean dynamics.

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