Deriving the spatial distribution and properties of radiating acoustic sources in a ship from a measurement of its signature in shallow water

2002 ◽  
Vol 112 (5) ◽  
pp. 2222-2222
Author(s):  
Marshall V. Hall
Keyword(s):  
Spatial Distribution ◽  
Shallow Water ◽  
Acoustic Sources

scholarly journals Features of spatial distribution of benthic infauna in a Mediterranean shallow-water bay

1991 ◽  
Vol 110 (2) ◽  
pp. 315-321 ◽  
Author(s):  
C. Palac�n ◽  
D. Martin ◽  
J. M. Gili
Keyword(s):  
Spatial Distribution ◽  
Shallow Water ◽  
Benthic Infauna

Aeroacoustic Source Distribution in an Inline Tube Array With a Pitch Ratio of 3

2014 ◽  
Vol 136 (5) ◽  
Author(s):  
Craig Meskell ◽  
Shane L. Finnegan
Keyword(s):  
Spatial Distribution ◽  
Tube Bundle ◽  
Cross Flow ◽  
Source Distribution ◽  
Element Analysis ◽  
Apparent Contradiction ◽  
Tandem Cylinders ◽  
Image Velocimetry ◽  
Pitch Ratio ◽  
Acoustic Sources

The flow induced acoustics in an inline tube bank (P/d = 3) subject to cross flow, indicative of a generic heat exchanger geometry, are examined over a range of flow velocities using particle image velocimetry (PIV) coupled with acoustic modal analysis using finite element analysis (FEA). The objective is twofold: to determine if the method originally developed for tandem cylinders is applicable to more geometrically complex configurations, with more restricted optical access; and hence to investigate the spatial distribution of acoustic sources within the tube array. The spatial and temporal aeroacoustic source distribution has been successfully obtained experimentally for the case of Strouhal acoustic coincidence (i.e., fa = fv). It is found that the acoustic sources are most intense behind the first row due to the spatial compactness of the vortices. However, a strong negative source (i.e., a sink) is also present in this location, so that the net contribution of the first row wake is small. In subsequent rows, the sources are weaker and more dispersed, but the sink is reduced dramatically. The result is that after the first row the remaining rows of the array contributes energy to the acoustic field. It is noted that, for the coincidence case in the tube bundle studied here, the spatial distribution of sources in the region around the first and second row is similar to the precoincidence regime found for tandem cylinders. This apparent contradiction requires further investigation. Nonetheless, it is concluded that the method of combining PIV with FEA to determine the source distribution can be applied to more complex geometries than previously reported.

scholarly journals Biodiversity Assessment of Chironomids (Diptera: Chironomidae) in Rajsamand Lake (Rajsamand, Rajasthan, India)

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Prajapat Gyata ◽  
Rawal Deepak
Keyword(s):  
Spatial Distribution ◽  
Environmental Factors ◽  
Shallow Water ◽  
Aquatic Ecosystems ◽  
Taxonomic Identification ◽  
Strongly Correlated ◽  
Biodiversity Assessment ◽  
Chironomid Larvae ◽  
Chironomid Community ◽  
First Time

Present study was performed for taxonomic identification, assemblage, richness, spatial distribution and abundance analysis of chironomid larvae in the benthic and lentic shoreline habitat of Rajsamand Lake, India. Chironomids play an important role in shallow water aquatic ecosystems, so this study will give an idea about ecology of this area. Topographical and environmental factors are strongly correlated with the composition of chironomid communities. No information is available regarding these organisms in this defined area, so this study would provide data for comparison with chironomid community present in nearby and other ar ea, where study on chironomids is already done or will be done. This study on chironomids was conducted for the first time in Rajsamand Lake, India. Specimens were collected at seven sampling sites along shoreline of the Lake. A total of four genera (viz. Chironomus, Cryptochironomus, Einfeldia and Polypedilum) were reported. Polypedilum was the most dominant genus reported followed by Chironomus, Einfeldia and Cryptochironomus. Genus Cryptochironomus was reported for the first time in Rajasthan.

scholarly journals Spatial distribution of copper in relation to recreational boating in a California shallow-water basin

2009 ◽  
Vol 25 (6) ◽  
pp. 417-433 ◽  
Author(s):  
Carlos Neira ◽  
Francisco Delgadillo-Hinojosa ◽  
Alberto Zirino ◽  
Guillermo Mendoza ◽  
Lisa A. Levin ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Shallow Water ◽  
Recreational Boating ◽  
Water Basin

scholarly journals Evaluation of the sedimentary environment of the block 102 of Song Hong basin by petrophysics

2015 ◽  
Vol 18 (4) ◽  
pp. 84-101
Author(s):  
Thanh Thi Ngoc Nguyen ◽  
Luan Thi Bui
Keyword(s):  
Spatial Distribution ◽  
Shallow Water ◽  
Marine Environment ◽  
Coastal Plain ◽  
Tidal Flat ◽  
Middle Miocene ◽  
Sedimentary Environment ◽  
Late Oligocene ◽  
Delta Plain

Interpretation of wireline logging data supported to recover the sedimentary environment of block 102 of Song Hong basin. It inchided in determination of the spatial distribution of source, reservoir and cap rocks and an indispensable part in oil exploration of this area. Resulted wireline logging data showed some sedimentary environment units as the following The late Oligocene was delta environment. It was identified as forming delta plain, swamp to lacustrine. The middle Miocene had changed to shallow water marine environment, which formed the shoreface, tidal flat, lagoon and channel. The lower Miocene was aluvial environment that changed into fluvial and coastal plain.

scholarly journals ON APPLICATIONS OF PARAMETRIC ACOUSTIC SOURCES TO SHALLOW WATER

1986 ◽  
Vol 35 (10) ◽  
pp. 1374
Author(s):  
Qian Zu-wen ◽  
Shao Dao-yuan
Keyword(s):  
Shallow Water ◽  
Acoustic Sources
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