scholarly journals Comparison of two numerical models for acoustic transmission loss in shallow‐water waveguides

1993 ◽  
Vol 93 (4) ◽  
pp. 2285-2285
Author(s):  
Steven G. Kargl ◽  
Raymond Lim
Keyword(s):  
Shallow Water ◽  
Transmission Loss ◽  
Numerical Models ◽  
Acoustic Transmission

Acoustic Transmission Loss in Shallow-Water Waveguides with an Sloping Bottom

2019 ◽  
Vol 65 (5) ◽  
pp. 527-536
Author(s):  
A. A. Lunkov ◽  
M. A. Shermeneva
Keyword(s):  
Shallow Water ◽  
Transmission Loss ◽  
Acoustic Transmission ◽  
Sloping Bottom

scholarly journals Kelvin wave hydraulic control induced by interactions between vortices and topography

2011 ◽  
Vol 687 ◽  
pp. 194-208 ◽  
Author(s):  
Andrew McC. Hogg ◽  
William K. Dewar ◽  
Pavel Berloff ◽  
Marshall L. Ward
Keyword(s):  
Shallow Water ◽  
Analytical Solutions ◽  
Critical Condition ◽  
Numerical Models ◽  
Kelvin Waves ◽  
Water Model ◽  
Hydraulic Jumps ◽  
Hydraulic Control ◽  
Kelvin Wave ◽  
Shallow Water Model

AbstractThe interaction of a dipolar vortex with topography is examined using a combination of analytical solutions and idealized numerical models. It is shown that an anticyclonic vortex may generate along-topography flow with sufficient speeds to excite hydraulic control with respect to local Kelvin waves. A critical condition for Kelvin wave hydraulic control is found for the simplest case of a 1.5-layer shallow water model. It is proposed that in the continuously stratified case this mechanism may allow an interaction between low mode vortices and higher mode Kelvin waves, thereby generating rapidly converging isopycnals and hydraulic jumps. Thus, Kelvin wave hydraulic control may contribute to the flux of energy from mesoscale to smaller, unbalanced, scales of motion in the ocean.

Wind effects in shallow‐water acoustic transmission

1989 ◽  
Vol 86 (4) ◽  
pp. 1530-1545 ◽  
Author(s):  
David E. Weston ◽  
Pamela A. Ching
Keyword(s):  
Shallow Water ◽  
Wind Effects ◽  
Acoustic Transmission

Experiments on time-frequency interference patterns in shallow-water acoustic transmission

1969 ◽  
Vol 10 (3) ◽  
pp. 424-429 ◽  
Author(s):  
D.E. Weston ◽  
D. Smith ◽  
G. Wearden
Keyword(s):  
Shallow Water ◽  
Acoustic Transmission ◽  
Time Frequency

scholarly journals Generalized Z-Grid Model for Numerical Weather Prediction

Atmosphere ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 179 ◽  
Author(s):  
Yuanfu Xie
Keyword(s):  
Shallow Water ◽  
Finite Volume ◽  
Numerical Models ◽  
Weather Prediction ◽  
Shallow Water Equation ◽  
Computing Time ◽  
Time Integration ◽  
Grid Model ◽  
Rotating Shallow Water ◽  
Volume Models

Z-grid finite volume models conserve all-scalar quantities as well as energy and potential enstrophy and yield better dispersion relations for shallow water equations than other finite volume models, such as C-grid and C-D grid models; however, they are more expensive to implement. During each time integration, a Z-grid model must solve Poisson equations to convert its vorticity and divergence to a stream function and velocity potential, respectively. To optimally utilize these conversions, we propose a model in which the stability and possibly accuracy on the sphere are improved by introducing more stencils, such that a generalized Z-grid model can utilize longer time-integration steps and reduce computing time. Further, we analyzed the proposed model’s dispersion relation and compared it to that of the original Z-grid model for a linearly rotating shallow water equation, an important property for numerical models solving primitive equations. The analysis results suggest a means of balancing stability and dispersion. Our numerical results also show that the proposed Z-grid model for a shallow water equation is more stable and efficient than the original Z-grid model, increasing the time steps by more than 1.4 times.

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