Shallow‐water tank experiments and model comparisons over range‐dependent elastic bottoms

2008 ◽  
Vol 123 (5) ◽  
pp. 3602-3602
Author(s):  
Jon M. Collis ◽  
Michael D. Collins ◽  
Harry J. Simpson ◽  
Raymond J. Soukup ◽  
William L. Siegmann
Keyword(s):  
Shallow Water ◽  
Water Tank ◽  
Model Comparisons

Tank experiments and model comparisons of shallow water acoustics over an elastic bottom

2005 ◽  
Vol 117 (4) ◽  
pp. 2576-2576
Author(s):  
Jon M. Collis ◽  
William L. Siegmann ◽  
Michael D. Collins ◽  
Erik C. Porse ◽  
Harry J. Simpson ◽  
...  
Keyword(s):  
Shallow Water ◽  
Shallow Water Acoustics ◽  
Model Comparisons ◽  
Elastic Bottom

Computational Prediction of Electric Fields in Shallow Water Testing Environment

2009 ◽  
Author(s):  
Stephanie A. Wimmer ◽  
Virginia G. DeGiorgi ◽  
Elizabeth A. Hogan
Keyword(s):  
Shallow Water ◽  
Electric Fields ◽  
Deep Water ◽  
Cathodic Protection ◽  
Water Environment ◽  
Computational Prediction ◽  
Water Tank ◽  
Testing Environment ◽  
Field Environment ◽  
Cathodic Protection System

There has been an increased need for understanding of how ship’s cathodic protection systems work in shallow water environment. This is a result of the evolving role of the US Navy. The existing cathodic protection system design process relies on experimental processes. This paper investigates a proposed modification to a deep water experimental facility to allow for measurements of electrical fields, a pertinent design measurement, in shallow water conditions. The modifications involve the insertion of a false bottom in the existing deep water tank. The work presented here are a series of computational studies that establish that the insertion of a false bottom would provide an electric field environment that is equivalent to shallow water for the depths considered.

scholarly journals A study on unpredictable shallow water channel behavior by various multipath patterns and experimental data analysis

2021 ◽  
Vol 9 (4B) ◽  
Author(s):  
Sumithra G ◽  
◽  
Meganathan D ◽  
Keyword(s):  
Shallow Water ◽  
Short Range ◽  
Water Channel ◽  
Signal Propagation ◽  
Propagation Model ◽  
Signal Frequency ◽  
Line Of Sight ◽  
Water Tank ◽  
Multipath Signal ◽  
Multipath Signal Propagation

In shallow water applications, multipath signal propagation is a major concern for robust communication. Multipath signal propagation is not explicitly seen in the channel, even though it is a main contributor for signal degradation. This fact motivated us to simulate multipath patterns to understand its influence in short-range communication. In this paper, a three-path signal propagation model is presented, where, besides the line of sight (LOS) signal, other two non-line of sight (NLOS) signals contact any point of channel boundary to reach the receiver. In simulation, the combination of eight possible multipath patterns is converged to estimate the received signal. A source fixed in water-tank periodically transmits low frequency acoustic signals 1 kHz and 1.5 kHz to the channel, and the receiver records them. The experiment was repeated for various input signal strengths. It has been observed that the simulation results coincide with the measured values. The good reception is noticed for signal frequency 1 kHz at 2.5m and 1.5 kHz at 1.2m. This study identifies the optimal signal strength for better signal reception in short range, which drives to the establishment of high-quality communication in shallow water.

scholarly journals Study of Gasdynamics with a Shallow Water Tank

1942 ◽  
Vol 1942 (71) ◽  
pp. 155-169
Author(s):  
Jiro Sugiura
Keyword(s):  
Shallow Water ◽  
Water Tank

Nonlinear sloshing and passage through resonance in a shallow water tank

2005 ◽  
Vol 56 (4) ◽  
pp. 645-680 ◽  
Author(s):  
E. A. Cox ◽  
J. P. Gleeson ◽  
M. P. Mortell
Keyword(s):  
Shallow Water ◽  
Water Tank ◽  
Nonlinear Sloshing

Data-model comparisons of reverberation at three shallow-water sites

1997 ◽  
Vol 22 (2) ◽  
pp. 309-316 ◽  
Author(s):  
F. Desharnais ◽  
D.D. Ellis
Keyword(s):  
Shallow Water ◽  
Data Model ◽  
Model Comparisons
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