Broadband normal mode energy metrics in the presence of internal waves

2013 ◽  
Vol 134 (5) ◽  
pp. 3990-3990
Author(s):  
Georges Dossot ◽  
Steven Crocker ◽  
James H. Miller ◽  
Gopu R. Potty ◽  
Mohsen Badiey
Keyword(s):  
Normal Mode ◽  
Internal Waves ◽  
Mode Energy

Statistics of acoustic normal mode energy for low frequency long range propagation in the ocean: Comparisons between observations and theory.

2010 ◽  
Vol 128 (4) ◽  
pp. 2395-2395
Author(s):  
Tarun K. Chandrayadula ◽  
John A. Colosi ◽  
Peter F. Worcester ◽  
Matthew A. Dzieciuch ◽  
James A. Mercer ◽  
...  
Keyword(s):  
Long Range ◽  
Normal Mode ◽  
Low Frequency ◽  
Mode Energy

scholarly journals Explosive instability due to flow over a rippled bottom

2019 ◽  
Author(s):  
Raunak Raj ◽  
Anirban Guha
Keyword(s):  
Normal Mode ◽  
Internal Waves ◽  
Large Amplitude ◽  
Tidal Flow ◽  
Negative Energy ◽  
The Other ◽  
Bragg Resonance ◽  
Explosive Instability ◽  
Shear Instabilities ◽  
The Waves

Abstract. In this paper, we study Bragg resonance, i.e. the triad interaction between surface and/or interfacial waves with bottom ripple, in the presence of background velocity. We show that when one of the constituent waves of the triad has negative energy, the amplitudes of all the waves grow exponentially. This is very different from classic Bragg resonance in which one wave decays to cause the growth of the other. The instabilities we observe are explosive and are different from normal mode shear instabilities since our velocity profiles are linearly stable. Our work may explain the existence of large amplitude internal waves over periodic bottom ripples in the presence of tidal flow observed in oceans and estuaries.

scholarly journals Explosive instability due to flow over a rippled bottom

2019 ◽  
Vol 26 (3) ◽  
pp. 283-290
Author(s):  
Anirban Guha ◽  
Raunak Raj
Keyword(s):  
Normal Mode ◽  
Internal Waves ◽  
Large Amplitude ◽  
Tidal Flow ◽  
Negative Energy ◽  
The Other ◽  
Bragg Resonance ◽  
Explosive Instability ◽  
Shear Instabilities ◽  
The Waves

Abstract. In this paper, we study Bragg resonance, i.e., the triad interaction between surface and/or interfacial waves with a bottom ripple, in the presence of background velocity. We show that when one of the constituent waves of the triad has negative energy, the amplitudes of all the waves grow exponentially. This is very different from classic Bragg resonance in which one wave decays to cause the growth of the other. The instabilities we observe are “explosive” and are different from normal mode shear instabilities since our velocity profiles are linearly stable. Our work may explain the existence of large-amplitude internal waves over periodic bottom ripples in the presence of tidal flow observed in oceans and estuaries.

Comparing the effects of internal waves, mode coupling, and change in bandwidth of a radiated signal on low mode energy propagation.

2009 ◽  
Vol 125 (4) ◽  
pp. 2492-2492
Author(s):  
Natalie Grigorieva ◽  
Gregory Fridman ◽  
James Mercer ◽  
Rex Andrew ◽  
Michael Wolfson ◽  
...  
Keyword(s):  
Internal Waves ◽  
Mode Coupling ◽  
Energy Propagation ◽  
Mode Energy

Normal mode energy estimation based on reconstructing the incoherent beamformed outputs from a horizontal array

2021 ◽  
Vol 150 (4) ◽  
pp. 2738-2748
Author(s):  
Duo Zhai ◽  
Fenghua Li ◽  
Bo Zhang ◽  
Feilong Zhu ◽  
Xishan Yang ◽  
...  
Keyword(s):  
Normal Mode ◽  
Energy Estimation ◽  
Mode Energy ◽  
Horizontal Array
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