scholarly journals Three-dimensional propagation effects near the mid-Atlantic Bight shelf break (L)

2002 ◽  
Vol 112 (2) ◽  
pp. 373-376 ◽  
Author(s):  
Kevin B. Smith ◽  
Chris W. Miller ◽  
Anthony F. D’Agostino ◽  
Brian Sperry ◽  
James H. Miller ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Shelf Break ◽  
Propagation Effects

Investigation of three‐dimensional propagation effects at the New Jersey shelf break front

2007 ◽  
Vol 121 (5) ◽  
pp. 3126-3126
Author(s):  
Kristy A. Moore ◽  
James H. Miller ◽  
Gopu R. Potty ◽  
James F. Lynch ◽  
Arthur Newhall
Keyword(s):  
New Jersey ◽  
Three Dimensional ◽  
Shelf Break ◽  
Propagation Effects

Three‐dimensional propagation effects near the Mid‐Atlantic Bight

1997 ◽  
Vol 102 (5) ◽  
pp. 3143-3143
Author(s):  
Kevin B. Smith ◽  
Ching‐Sang Chiu ◽  
James H. Miller ◽  
James F. Lynch ◽  
Glen G. Gawarkiewicz
Keyword(s):  
Three Dimensional ◽  
Propagation Effects

scholarly journals Focused sound from three-dimensional sound propagation effects over a submarine canyon

2011 ◽  
Vol 129 (6) ◽  
pp. EL260-EL266 ◽  
Author(s):  
Linus Y. S. Chiu ◽  
Ying-Tsong Lin ◽  
Chi-Fang Chen ◽  
Timothy F. Duda ◽  
Brian Calder
Keyword(s):  
Sound Propagation ◽  
Three Dimensional ◽  
Submarine Canyon ◽  
Propagation Effects

scholarly journals EXPERIMENTAL STUDY OF SOLITARY WAVE EVOLUTION OVER A 3D SHALLOW SHELF

2011 ◽  
Vol 1 (32) ◽  
pp. 1 ◽  
Author(s):  
Patrick J. Lynett ◽  
David Swigler ◽  
Sangyoung Son ◽  
Duncan Bryant ◽  
Scott Socolofsky
Keyword(s):  
Free Surface ◽  
Shallow Water ◽  
Three Dimensional ◽  
Maximum Velocity ◽  
Turbulent Energy ◽  
Shelf Break ◽  
Plan View ◽  
Fluid Velocities ◽  
Water Region ◽  
Side Walls

A laboratory experiment was performed to investigate the three-dimensional turbulence and kinematic properties that develop due to a breaking solitary propagating over an irregular shallow water bathymetry. The bathymetry consisted of a deep water region connected to a shallow shelf via a relatively steep slope. The offshore boundary of the shelf break varied in the longshore direction, such that the shelf had a triangular shape in plan view, with the widest part of the shelf along the basin centerline. Free surface elevations and fluid velocities were measured using wave gauges and three-dimensional acoustic-Doppler velocimeters (ADVs), respectively. From the free surface elevations the evolution and runup of the wave was revealed; while from the ADVs, the velocity and turbulent energy was determined and specific turbulent events and coherent structures were identified. It was found that significant shoaling was confined to areas with gentler sloping bathymetry near the basin side walls and the runup varied weakly in the alongshore direction. The runup was characterized by a refraction-generated jetting mechanism caused by the convergence of water mass near the basin centerline. The jetting mechanism caused the greatest cross-shore velocities to be located near the basin centerline. The greatest turbulent events were well correlated to borefronts, of which there were four, caused by the leading wave, beach reflections, and shelf-trapped oscillations. Along the shelf break, a large, shallow-water eddy developed which was found to have a peculiar three-dimensional flow field, where maximum velocity components were found at mid-depth.

THREE-DIMENSIONAL ACOUSTICS EFFECTS IN THE ASIAEX SCS EXPERIMENT

2009 ◽  
Vol 17 (01) ◽  
pp. 11-27 ◽  
Author(s):  
YUNG-SHENG CHIU ◽  
YUAN-YING CHANG ◽  
LI-WEN HSIEH ◽  
MEI-CHUN YUAN ◽  
CHI-FANG CHEN
Keyword(s):  
South China Sea ◽  
Internal Wave ◽  
South China ◽  
Three Dimensional ◽  
Shelf Break ◽  
Nonlinear Internal Wave ◽  
Wave Refraction ◽  
China Sea ◽  
3D Effects ◽  
Ocean Environment

A three-dimensional (3D) ocean environment is assimilated with measured ocean data in the ASIAEX SCS (Asian Seas International Acoustics EXperiment, South China Sea) experiment. The experiment site is characterized as an active internal wave propagation region along the Northwestern shelf break of the South China Sea. Three-dimensional acoustics effects in the area are studied using FOR3DW, a wide-angle version of the parabolic equation code FOR3D (a Finite difference solution, an Ordinary differential equation, and Rational function approximations for solving 3D problems), and MOS3DPEF (MOdal Spectrum analysis based on 3D PE Field). The TL comparison between Nx2D and 3D calculations are shown to demonstrate the 3D effects. Variations in topography of the shelf break and in the water column due to the internal waves cause the 3D effects in the acoustic field. The intercomparison of the importance of bottom steering 3D effects and nonlinear internal wave refraction 3D effects is therefore proposed to realize which possesses the major part of the 3D effects. Also, 3D modal analysis results show that the nonlinear internal wave front causes severe horizontal refraction for higher modes.

On the formation and propagation of nonlinear internal boluses across a shelf break

2007 ◽  
Vol 577 ◽  
pp. 137-159 ◽  
Author(s):  
SUBHAS K. VENAYAGAMOORTHY ◽  
OLIVER B. FRINGER
Keyword(s):  
High Resolution ◽  
Gravity Waves ◽  
Three Dimensional ◽  
Internal Gravity Waves ◽  
Gravity Currents ◽  
Interaction Process ◽  
Shelf Break ◽  
Ambient Fluid ◽  
Dense Fluid ◽  
Incident Waves

High-resolution two- and three-dimensional numerical simulations are performed of first-mode internal gravity waves interacting with a shelf break in a linearly stratified fluid. The interaction of nonlinear incident waves with the shelf break results in the formation of upslope-surging vortex cores of dense fluid (referred to here as internal boluses) that propagate onto the shelf. This paper primarily focuses on understanding the dynamics of the interaction process with particular emphasis on the formation, structure and propagation of internal boluses onshelf. A possible mechanism is identified for the excitation of vortex cores that are lifted over the shelf break, from where (from the simplest viewpoint) they essentially propagate as gravity currents into a linearly stratified ambient fluid.

A discussion of three‐dimensional wave propagation effects

1987 ◽  
Vol 82 (S1) ◽  
pp. S44-S44 ◽  
Author(s):  
Ding Lee ◽  
Paul D. Scully‐Power ◽  
George Botseas ◽  
William L. Siegmann
Keyword(s):  
Wave Propagation ◽  
Three Dimensional ◽  
Propagation Effects ◽  
Dimensional Wave

scholarly journals Internal Tides in the Southwestern Atlantic off Brazil: Observations and Numerical Modeling

2007 ◽  
Vol 37 (6) ◽  
pp. 1512-1526 ◽  
Author(s):  
Adriene F. Pereira ◽  
Belmiro M. Castro
Keyword(s):  
Continental Shelf ◽  
Three Dimensional ◽  
Internal Tide ◽  
Equation Model ◽  
Shelf Break ◽  
Internal Tides ◽  
Southwestern Atlantic ◽  
Model Response ◽  
Southwestern Atlantic Ocean ◽  
Vertical Displacements

Abstract Data collected from moored instruments, deployed over the southeastern Brazilian continental shelf during the summer and winter months of 2001, show internal tide activity near the shelf break. To help to elucidate the observations, a fully three-dimensional nonlinear primitive equation model is applied to simulate the regional barotropic and baroclinic tides. Two semidiurnal (M2 and S2) and two diurnal (K1 and O1) tidal frequencies are considered. Tidal surface elevations are relatively small over the whole modeled area, reaching maximum values of about 0.40 m for M2 and 0.11 m for O1. Comparison between observed and computed tide elevation and Greenwich phase shows reasonable agreement. When the baroclinic response of the model is investigated, stratification is prescribed using summer and winter climatology data of potential density. In this case, the model response to summer and winter stratifications is very similar and internal tides are generated over the shelf break and slope, with vertical displacements up to 25 m, and seaward propagation. Modeled semidiurnal tidal ellipses agree well with winter and summer observations. Observed diurnal tidal ellipses in the middle of the continental shelf and close to the shelf break during summer show an intensification through the water column that could not be represented by the model. Estimates of the total baroclinic M2 offshore energy flux are about 3.5 and 0.5 MW considering winter and summer stratifications, respectively. Although these quantities are three orders of magnitude less than that estimated for regions known for intense internal tides, they refer to offshore fluxes computed for a very small section of the southeastern Brazilian shelf. This is the first published investigation into internal tides in the southwestern Atlantic Ocean off Brazil.

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