The effect of currents on the generation of internal waves by a barotropic tide near an underwater ridge

1997 ◽  
Vol 8 (3) ◽  
pp. 155-167
Author(s):  
E. M. Kolomoitseva ◽  
L. V. Cherkesov
Keyword(s):  
Internal Waves ◽  
Barotropic Tide

scholarly journals Huge internal waves in the vicinity of the Spitsbergen Island (Barents Sea)

2011 ◽  
Vol 11 (3) ◽  
pp. 981-986 ◽  
Author(s):  
O. E. Kurkina ◽  
T. G. Talipova
Keyword(s):  
Numerical Model ◽  
Cross Section ◽  
Internal Waves ◽  
Barents Sea ◽  
Stratified Fluid ◽  
High Latitudes ◽  
Barotropic Tide ◽  
Nonlinear Internal Waves ◽  
Total Height ◽  
The Barents Sea

Abstract. The generation of huge amplitude internal waves by the barotropic tide in the Barents Sea at high latitudes is examined using the numerical model of the Euler 2-D equations for incompressible stratified fluid. The area considered is located between the Spitsbergen (Svalbard) Island and the Franz-Victoria Trough with a cross-section of 350 km length. There are two underwater hills about 100–150 m high on the background depth of about 300 m. It is shown that intensive nonlinear internal waves with amplitudes up to 50 m and lengths of about 6–12 km are generated in this zone. The total height of such waves is huge and they must be considered as a significant factor of the environment in this basin.

scholarly journals Baroclinic Energy Flux at the Hawaiian Ridge: Observations from the R/P FLIP

2006 ◽  
Vol 36 (6) ◽  
pp. 1104-1122 ◽  
Author(s):  
Luc Rainville ◽  
Robert Pinkel
Keyword(s):  
Internal Waves ◽  
Energy Flux ◽  
Neap Tide ◽  
Internal Tide ◽  
Field Site ◽  
Energy Fluxes ◽  
Barotropic Tide ◽  
Research Platform ◽  
Channel Beam ◽  
Made In

Abstract Estimates of baroclinic energy flux are made in the immediate “Nearfield” (September–October 2002) and 450 km offshore (“Farfield”; October–November 2001) of the Kaena Ridge, an active barotropic-to-baroclinic conversion site. The flux estimates are based on repeated profiles of velocity and density obtained from the Research Platform Floating Instrument Platform (FLIP) as an aspect of the Hawaii Ocean Mixing Experiment. Energetic beams associated with both semidiurnal and diurnal internal waves are observed in the Kauai Channel. Beam depths and orientations are consistent with generation along the upper flanks of the ridge. At the far-field site, the baroclinic energy flux is borne primarily by first-mode semidiurnal waves. The energy flux associated with the entire spectrum of internal waves is computed by cross-spectral analysis. Significant energy fluxes are found in the inertial, diurnal, semidiurnal, and twice-semidiurnal frequency bands. The semidiurnal energy flux strongly dominates the spectrum at both sites. The flux magnitude follows the spring–neap cycle of the semidiurnal barotropic tide. The averaged depth-integrated mode-1 semidiurnal energy flux (over the entire water column) in the Farfield is found to be 1.7 ± 0.3 kW m−1 away from the ridge, with peak values up to 4 kW m−1. Small fluxes toward the ridge are occasionally seen at neap tide. At both sites, energy fluxes in the diurnal frequency band represent 15%–20% of the semidiurnal energy flux. In the Farfield, the magnitude of the diurnal energy flux varies in accord with the fortnightly cycle of the barotropic semidiurnal tide, rather than with the diurnal forcing, suggesting that energy for those waves is supplied by a cross-frequency transfer from the low-vertical-mode M2 internal tide to higher-mode internal waves at frequencies ½M2. In the Nearfield, the diurnal flux varies with fluctuations in both diurnal and semidiurnal forcing.

scholarly journals Can barotropic tide–eddy interactions excite internal waves?

2013 ◽  
Vol 721 ◽  
pp. 1-27 ◽  
Author(s):  
M.-P. Lelong ◽  
E. Kunze
Keyword(s):  
Internal Wave ◽  
Wave Field ◽  
Internal Waves ◽  
Tidal Current ◽  
Deep Ocean ◽  
Wave Excitation ◽  
Barotropic Tide ◽  
Internal Wave Field ◽  
Flow Components ◽  
Internal Wave Generation

AbstractThe interaction of barotropic tidal currents and baroclinic geostrophic eddies is considered theoretically and numerically to determine whether energy can be transferred to an internal wave field by this process. The eddy field evolves independently of the tide, suggesting that it acts catalytically in facilitating energy transfer from the barotropic tide to the internal wave field, without exchanging energy with the other flow components. The interaction is identically zero and no waves are generated when the barotropic tidal current is horizontally uniform. Optimal internal wave generation occurs when the scales of tide and eddy fields satisfy resonant conditions. The most efficient generation is found if the tidal current horizontal scale is comparable to that of the eddies, with a weak maximum when the scales differ by a factor of two. Thus, this process is not an effective mechanism for internal wave excitation in the deep ocean, where tidal current scales are much larger than those of eddies, but it may provide an additional source of internal waves in coastal areas where horizontal modulation of the tide by topography can be significant.

Generation of internal waves by a barotropic tide in the coastal zone

2000 ◽  
Vol 10 (6) ◽  
pp. 503-512
Author(s):  
S. V. Dovgaya ◽  
L. V. Cherkesov
Keyword(s):  
Internal Waves ◽  
Coastal Zone ◽  
Barotropic Tide

The generation of internal waves by the barotropic tide at an oceanic ridge

1992 ◽  
Vol 3 (5) ◽  
pp. 323-329 ◽  
Author(s):  
S. V. Dovgaya ◽  
L. V. Cherkesov
Keyword(s):  
Internal Waves ◽  
Oceanic Ridge ◽  
Barotropic Tide
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