Analysis of internal solitary waves observed in Davis Strait

Cummins, Patrick F.; LeBlond, Paul H.

doi:10.1080/07055900.1984.9649192

Cited by 7 publications

(8 citation statements)

References 21 publications

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“…Packets of short internal waves have been detected as far north as Davis Strait (Cummins and LeBlond, 1984) which, in conjunction with theoretical predictions, indicates that they are a ubiquitous feature of the continental shelf break circulation in the western North Atlantic.…”

Section: Internal Tide and Nonlinear Waves 348 338supporting

confidence: 51%

Physical Processes at the Shelf Edge in the Northwest Atlantic

Smith¹,

Sandstrom²

1988

J. Northw. Atl. Fish. Sci.

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Abrupt depth changes at the edges of continental shelves leading to important physical processes in the ocean are described with reviews on the progress in understanding three such processes: (1) interaction of offshore currents and eddies with the continental margin; (2) wind-driven upwelling at the shelf break; (3) generation of internal tides and nonlinear waves by the M2 surface tide. Two possible modes of interaction between offshore currents and coastal waters are contrasted. The first is characterized by eddy exchange created by a current guided along the shelf edge (as on the Labrador and Newfoundland shelves or in the United States South Atlantic Bight) while the second involves remote forcing by low-frequency topographic Rossby waves radiated from offshore meanders and rings to the shelf edge. In addition, wind-driven upwelling from depths of 400 m or more results from moderate (10-15 m S-1) but persistent alongshore wind. Complex bathymetry of the shelf may cause anomalously high currents in a fully three-dimensional circulation. Large-amplitude internal waves driven by the M2 surface tide are a ubiquitous feature of the shelf edge circulation. The intense vertical mixing associated with these waves promotes high levels of biological productivity at the shelf edge by continuously supplying nutrients to the surface layers.

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Section: Internal Tide and Nonlinear Waves 348 338supporting

confidence: 51%

Physical Processes at the Shelf Edge in the Northwest Atlantic

Smith¹,

Sandstrom²

1988

J. Northw. Atl. Fish. Sci.

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“…6a in Ref. [4], i.e. the upper layer 25.9 and the lower 27.5 and thus the magnitude of σ is about 2.0 × 10 −3 .…”

Section: In-situ Observations and Model Certificationmentioning

confidence: 97%

“…(28) and (29) in two layer case, we compare theoretical predictions with in situ observations. For this study, the measurements came from several current meters and a thermistor chain nearby a drill-ship operating at the site (62 • 11 N, 62 • 59 W) in Davis Strait on the Atlantic coast of northern Canada by Cummins and Le Blond [4]. One of the reasons for this program was to warn the drill-ship of large currents associated with approaching internal waves.…”

Section: In-situ Observations and Model Certificationmentioning

confidence: 99%

“…Nevertheless, their associated currents have profound implications in the design of ocean engineering to guarantee the safety of offshore structures. For example, current meters and thermistor chains were deployed in the proximity of a drill-ship over the continental shelf off Baffin Island to detect large currents associated with approaching internal waves, which displayed the undesirable effect of deflecting the dynamically positioned drill-ship [4]. As an additional example, the interaction between strong current on the Norwegian shelf slope and the pipelines of long spans along the uneven sea floor nearby the gas field Ormen Lange excited unexpected coupling vibration.…”

Section: Introductionmentioning

confidence: 98%

“…In the north of the South China Sea, strong current of about 2 m/s induced by a group of internal solitons has swung the tanker connected with drilling rig about 110 • in a few minutes [2]. An oceanographic program was conducted to measure near-surface currents to warn the drill-ship of large currents associated with approaching internal waves [4]. Other typical accident report includes Osborne and Burch [5], who thought that drilling rigs have to withstand the internal wave force.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of current induced by long internal solitary waves in stratified ocean

Zhang

2010

Acta Mech Sin

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An approximate theoretical expression for the current induced by long internal solitary waves is presented when the ocean is continuously or two-layer stratified. Particular attention is paid to characterizing velocity fields in terms of magnitude, flow components, and their temporal evolution/spatial distribution. For the two-layer case, the effects of the upper/lower layer depths and the relative layer density difference upon the induced current are further studied. The results show that the horizontal components are basically uniform in each layer with a shear at the interface. In contrast, the vertical counterparts vary monotonically in the direction of the water depth in each layer while they change sign across the interface or when the wave peak passes through. In addition, though the vertical components are generally one order of magnitude smaller than the horizontal ones, they can never be neglected in predicting the heave response of floating platforms in gravitationally neutral balance. Comparisons are made between the partial theoretical results and the observational field data. Future research directions regarding the internal wave induced flow field are also indicated.

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On the dynamics of internal waves in a nonlinear, weakly nonhydrostatic three‐layer ocean

Rubino¹,

Brandt²,

Weigle³

2001

J. Geophys. Res.

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Abstract. Aspects of the dynamics of internal solitary waves evolving in a three-layer ocean are investigated using a new numerical multilayer model that solves the nonlinear, weakly nonhydrostatic Boussinesq equations and uses high-resolution in situ data. The model applications refer to two different phenomena frequently observed in the real ocean, which can be described using a three-layer model rather than a two-layer model. In the first application the influence of the strength of a shallow seasonal thermocline superimposed on a two-layer permanent stratification on the structure of internal solitary waves is studied. It is found that while for small to medium wave amplitudes a decrease in the strength of the thermocline yields an increase in the simulated wavelengths, for large wave amplitudes this dependence is no longer monotonic. In particular, in the limiting case of a vanishing thermocline, first-mode internal solitary wave solutions of the three-layer numerical model tend to the analytical internal solitary wave solutions of the Miyata equations, a two-layer model, in which the full nonlinearity of the shallow-water theory up to first-order phase dispersion is retained. In the second application that refers particularly to high-resolution

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Analysis of internal solitary waves observed in Davis Strait

Abstract: Current meters and a thermistor chain deployed in the proximity of a drill-ship over the continental shelf off Baffin

Cited by 7 publications

References 21 publications

Physical Processes at the Shelf Edge in the Northwest Atlantic

Physical Processes at the Shelf Edge in the Northwest Atlantic

Analysis of current induced by long internal solitary waves in stratified ocean

On the dynamics of internal waves in a nonlinear, weakly nonhydrostatic three‐layer ocean

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