Phase and travel‐time variability of adiabatic acoustic normal modes due to scattering from a rough sea surface, with applications to propagation in shallow‐water and high‐latitude regions

1989 ◽  
Vol 85 (1) ◽  
pp. 83-89 ◽  
Author(s):  
James F. Lynch ◽  
James H. Miller ◽  
Ching Sang Chiu
Keyword(s):  
Shallow Water ◽  
Travel Time ◽  
High Latitude ◽  
Normal Modes ◽  
Sea Surface ◽  
Time Variability ◽  
Rough Sea Surface ◽  
Travel Time Variability ◽  
Rough Sea

scholarly journals Effects of wind-generated bubbles layer on sound propagation underneath rough sea surface in shallow water

2020 ◽  
Vol 69 (2) ◽  
pp. 024303
Author(s):  
Mei-Juan Yao ◽  
Li-Cheng Lu ◽  
Bing-Wen Sun ◽  
Sheng-Ming Guo ◽  
Li Ma
Keyword(s):  
Shallow Water ◽  
Sound Propagation ◽  
Sea Surface ◽  
Rough Sea Surface ◽  
Rough Sea

Investigation of Sea Surface Effect on Shallow Water Reverberation by Coupled Mode Method

2017 ◽  
Vol 25 (02) ◽  
pp. 1750017 ◽  
Author(s):  
Bo Gao ◽  
Ning Wang ◽  
Hao Zhong Wang
Keyword(s):  
Shallow Water ◽  
Long Range ◽  
Surface Effect ◽  
Sea Surface ◽  
Surface Scattering ◽  
Sea State ◽  
Coupled Mode ◽  
Mode Method ◽  
Rough Sea Surface ◽  
Rough Sea

The effects of rough sea surface on the long-range bottom reverberation in shallow seas are studied by the coupled mode reverberation theory. The scattering effect caused by irregular rough sea surface is described by couple coefficients. The decaying rules of long-range bottom reverberation level are simulated at different sea states, and the rough sea surface effect on the coherence of distant bottom reverberation is also discussed. It is indicated that irregular upper boundary has changed the propagation effect of the shallow water waveguide, and bottom reverberation, which is dominated among other kinds of reverberation in shallow water, is affected by the sea surface scattering as the increasing sea state. Compared with other literatures, the emphasis of this paper is to present the mechanism of rough sea surface scattering by describing the transfer of energy between different modes, and the details of energy transitions between different modes which are caused by sea surface scattering are presented for different sea states. With the increasing sea state, stronger mode coupling caused by surface scattering would affect the intensity and its space coherence of bottom reverberation obviously.

The effect of a rough sea surface on acoustic normal modes

2007 ◽  
Vol 121 (5) ◽  
pp. 3039-3039
Author(s):  
James H. Miller ◽  
James F. Lynch
Keyword(s):  
Normal Modes ◽  
Sea Surface ◽  
Rough Sea Surface ◽  
Rough Sea

Shallow water propagation in the presence of a rough sea surface and the associated bubble clouds

1995 ◽  
Vol 97 (5) ◽  
pp. 3403-3403
Author(s):  
Guy V. Norton ◽  
Jorge C. Novarini ◽  
Richard S. Keiffer
Keyword(s):  
Shallow Water ◽  
Sea Surface ◽  
Bubble Clouds ◽  
Rough Sea Surface ◽  
Rough Sea

Two-Position HF Scattering from the Rough Sea Surface. II. Experiment

2005 ◽  
Vol 64 (12) ◽  
pp. 1003-1016
Author(s):  
A. S. Bryukhovetsky ◽  
Yu. M. Yampolski ◽  
A. S. Kashcheyev ◽  
S. B. Kashcheyev ◽  
A. B. Koloskov ◽  
...  
Keyword(s):  
Sea Surface ◽  
Rough Sea Surface ◽  
Rough Sea

Two-Position HF Scattering from the Rough Sea Surface. I. Theory

2005 ◽  
Vol 64 (12) ◽  
pp. 991-1001
Author(s):  
A. S. Bryukhovetsky ◽  
Yu. M. Yampolski ◽  
A. S. Kashcheyev ◽  
S. B. Kashcheyev
Keyword(s):  
Sea Surface ◽  
Rough Sea Surface ◽  
Rough Sea

Road Pricing under Travel Time Variability

2019 ◽  
Author(s):  
Gege Jiang ◽  
Hong Kam LO ◽  
Zheng LIANG
Keyword(s):  
Travel Time ◽  
Road Pricing ◽  
Time Variability ◽  
Travel Time Variability

scholarly journals Measuring Recurrent and Nonrecurrent Traffic Congestion

2003 ◽  
Vol 1856 (1) ◽  
pp. 118-124 ◽  
Author(s):  
Alexander Skabardonis ◽  
Pravin Varaiya ◽  
Karl F. Petty
Keyword(s):  
Los Angeles ◽  
Travel Time ◽  
San Francisco ◽  
Traffic Congestion ◽  
Real Life ◽  
Time Variability ◽  
Loop Detectors ◽  
Bay Area ◽  
Freeway Corridors ◽  
Travel Time Variability

A methodology and its application to measure total, recurrent, and nonrecurrent (incident related) delay on urban freeways are described. The methodology used data from loop detectors and calculated the average and the probability distribution of delays. Application of the methodology to two real-life freeway corridors in Los Angeles, California, and one in the San Francisco, California, Bay Area, indicated that reliable measurement of congestion also should provide measures of uncertainty in congestion. In the three applications, incident-related delay was found to be 13% to 30% of the total congestion delay during peak periods. The methodology also quantified the congestion impacts on travel time and travel time variability.

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