On the dipole acoustic source level of breaking waves

1994 ◽  
Vol 96 (5) ◽  
pp. 3036-3044 ◽  
Author(s):  
Li Ding ◽  
David M. Farmer
Keyword(s):  
Breaking Waves ◽  
Acoustic Source ◽  
Source Level

A hydro‐acoustic source model in calculating noise field generated by breaking waves

2005 ◽  
Vol 118 (3) ◽  
pp. 2003-2003
Author(s):  
Xuemei Chen ◽  
Steven L. Means ◽  
William G. Szymczak ◽  
Joel C. W. Rogers
Keyword(s):  
Breaking Waves ◽  
Source Model ◽  
Acoustic Source ◽  
Noise Field

Acoustic source‐level measurements for a variety of merchant ships

1991 ◽  
Vol 89 (2) ◽  
pp. 691-699 ◽  
Author(s):  
Paul Scrimger ◽  
Richard M. Heitmeyer
Keyword(s):  
Acoustic Source ◽  
Source Level

Opto-Spectrum Measurement and Analysis of Underwater Plasma Acoustic Source Pulse Discharge

2011 ◽  
Vol 105-107 ◽  
pp. 1872-1875
Author(s):  
Jun Zhang ◽  
Xin Wu Zeng ◽  
Yi Bo Wang ◽  
Dan Chen
Keyword(s):  
Arc Discharge ◽  
Pulse Discharge ◽  
Pulse Length ◽  
High Voltage Pulse ◽  
Discharge Voltage ◽  
Profile Measurement ◽  
Acoustic Source ◽  
Spectrum Measurement ◽  
Long Time ◽  
Source Level

Underwater plasma acoustic source (UPAS) with high voltage pulse arc discharge produced pressure wave has the advantage of adjustable pulse length, high source level output, and no pollution to the environment. In recent years, this kind of source has been gradually used in domain as long range target detection, geo-acoustic profile measurement, and frogman threats deposal etc. While for a fairly long time, we’re lack of research on the company product of sound—light. In this paper, we measured the opto-spectrum of UPAS by experiment, and found its spectrum is of continuous spectrum and its dominant energy is around 500nm, if we raise the discharge voltage, reduce the gap distance of the tips, the spectrum amplitude and half peak amplitude width will increase, and if we change steel tips with copper tips, the light energy distribution and amplitude of the spectrum will change.

scholarly journals Shock formation and cavitation as limitations on acoustic source level

1978 ◽  
Vol 63 (S1) ◽  
pp. S9-S10
Author(s):  
F. R. Horneck ◽  
J. W. Young
Keyword(s):  
Shock Formation ◽  
Acoustic Source ◽  
Source Level

Bulk drag coefficient of a subaquatic vegetation subjected to irregular waves: Influence of Reynolds and Keulegan-Carpenter numbers

2020 ◽  
pp. 34-42
Author(s):  
Thibault Chastel ◽  
Kevin Botten ◽  
Nathalie Durand ◽  
Nicole Goutal
Keyword(s):  
Drag Coefficient ◽  
Wave Height ◽  
Wave Attenuation ◽  
Empirical Relationship ◽  
Breaking Waves ◽  
Irregular Waves ◽  
Geometrical Parameters ◽  
Flume Experiments ◽  
Seagrass Meadows ◽  
Artificial Vegetation

Seagrass meadows are essential for protection of coastal erosion by damping wave and stabilizing the seabed. Seagrass are considered as a source of water resistance which modifies strongly the wave dynamics. As a part of EDF R & D seagrass restoration project in the Berre lagoon, we quantify the wave attenuation due to artificial vegetation distributed in a flume. Experiments have been conducted at Saint-Venant Hydraulics Laboratory wave flume (Chatou, France). We measure the wave damping with 13 resistive waves gauges along a distance L = 22.5 m for the “low” density and L = 12.15 m for the “high” density of vegetation mimics. A JONSWAP spectrum is used for the generation of irregular waves with significant wave height Hs ranging from 0.10 to 0.23 m and peak period Tp ranging from 1 to 3 s. Artificial vegetation is a model of Posidonia oceanica seagrass species represented by slightly flexible polypropylene shoots with 8 artificial leaves of 0.28 and 0.16 m height. Different hydrodynamics conditions (Hs, Tp, water depth hw) and geometrical parameters (submergence ratio α, shoot density N) have been tested to see their influence on wave attenuation. For a high submergence ratio (typically 0.7), the wave attenuation can reach 67% of the incident wave height whereas for a low submergence ratio (< 0.2) the wave attenuation is negligible. From each experiment, a bulk drag coefficient has been extracted following the energy dissipation model for irregular non-breaking waves developed by Mendez and Losada (2004). This model, based on the assumption that the energy loss over the species meadow is essentially due to the drag force, takes into account both wave and vegetation parameter. Finally, we found an empirical relationship for Cd depending on 2 dimensionless parameters: the Reynolds and Keulegan-Carpenter numbers. These relationships are compared with other similar studies.

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