Direct measurements of sediment sound speed at mid- to high-frequency in a sand sediment

2011 ◽  
Vol 130 (4) ◽  
pp. 2381-2381
Author(s):  
Jie Yang ◽  
Brian T. Hefner ◽  
Dajun Tang
Keyword(s):  
High Frequency ◽  
Sound Speed ◽  
Direct Measurements

scholarly journals Temporal variability of exchange between groundwater and surface water based on high-frequency direct measurements of seepage at the sediment-water interface

2013 ◽  
Vol 49 (5) ◽  
pp. 2975-2986 ◽  
Author(s):  
Donald O. Rosenberry ◽  
Richard W. Sheibley ◽  
Stephen E. Cox ◽  
Frederic W. Simonds ◽  
David L. Naftz
Keyword(s):  
Surface Water ◽  
Temporal Variability ◽  
High Frequency ◽  
Water Interface ◽  
Direct Measurements ◽  
Water Based

scholarly journals A diverse group of echogenic particles observed with a broadband, high frequency echosounder

2017 ◽  
Vol 75 (2) ◽  
pp. 471-482 ◽  
Author(s):  
Christian Briseño-Avena ◽  
Peter J S Franks ◽  
Paul L D Roberts ◽  
Jules S Jaffe
Keyword(s):  
Acoustic Waves ◽  
High Frequency ◽  
Sound Speed ◽  
Diverse Group ◽  
Marine Snow ◽  
Frequency Range ◽  
Coastal Regions ◽  
The Past ◽  
Potential Sources ◽  
Acoustic Surveys

Abstract In 1980, Holliday and Pieper stated: “Most sound scattering in the ocean volume can be traced to a biotic origin.” However, most of the bioacoustics research in the past three decades has focused on only a few groups of organisms. Targets such as small gelatinous organisms, marine snow, and phytoplankton, e.g. have been generally to be considered relatively transparent to acoustic waves due to their sizes and relatively low sound speed and density contrasts relative to seawater. However, using a broadband system (ZOOPS-O2) we found that these targets contributed significantly to acoustic returns in the 1.5–2.5 MHz frequency range. Given that phytoplankton and marine snow layers are ubiquitous features of coastal regions; this works suggests that they should be considered as potential sources of backscatter in biological acoustic surveys.

Characteristics of the equations of motion of a reacting gas

1958 ◽  
Vol 4 (3) ◽  
pp. 276-282 ◽  
Author(s):  
L. J. F. Broer
Keyword(s):  
Heat Conduction ◽  
High Frequency ◽  
Sound Speed ◽  
Reaction Rate ◽  
Equations Of Motion ◽  
Sound Waves ◽  
Velocity Of Sound ◽  
Frequency Limit ◽  
Chemically Reacting ◽  
Set Up

The equations of motion for a chemically reacting gas in the absence of viscosity and heat conduction are set up. It is shown that the characteristic speed defined by this set of equations is the high-frequency limit of the phase velocity of sound waves as long as the reaction rate is finite. At infinite reaction rate (chemical equilibrium) the characteristics suddenly change to the lowfrequency sound speed. The nature of this transition is discussed in connection with a recent paper of Resler (1957).

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