Browsing Institute's contributions by Subject "acoustics"
Now showing items 1-10 of 10
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A study of marine ambient acoustic noise in relation to marine life in Antarctic waters during austral summer of 18 th Indian Expedition to Antarctica (1998-99)
(Department of Ocean Development; New Delhi; India, 2002)The exploration of the Antarctic Ocean (Southern Ocean) receives much attention by Oceanographers of various disciplines, because the ocean supports all the animal life and has the tremendous influence on meteorology and ... -
Acoustic basement: Its relevance to Karwar port development
(Allied, Chennai (India), 1996)Detailed bathymetric, side-scan sonar and shallow seismic surveys followed by sediment sampling were conducted in Karwar Bay, Karnataka, India to study the surficial geology with special emphasis on basement configuration ... -
Acoustic characteristics of the water of the Bay of Bengal
(NISCAIR, New Delhi, 1993)Acoustic eigen rays (rays connecting the source and receiver) have been indentified and their turning depth, path length, travel time etc. evaluated. Acoustic intensity loss due to mean environmental conditions, vergence ... -
Acoustic Masking due to Gases in Shallow Seismic profiling on the shelf off Bombay
(CSIR-NISCAIR, 1980)Shallow seismic profiling on the inner shelf off Bombay indicates 25-35 m thick acoustically transparent clays covering the seabed. At depth of 22 to 30 m and 50 m the profiles and echograms are marked by turbidity resembling ... -
Acoustic propagations in the presence of a subsurface cold core eddy in the Bay of Bengal - A case study
(PORSEC-94, Melbourne, Australia, 1994)Acoustic characteristics of a cold core eddy, observed in the Bay of Bengal during southwest monsoon period is studied using CTD data along the western boundary. The presence of eddy brings about a reduction in the ambient ... -
Acoustic waveguide characteristics of the Indian Ocean - north of equator
(PORSEC Committee, Shimizu, Japan, 1992)The acoustic characteristics of the waters of the Arabian Sea and Bay of Bengal, constituting the northern Indian Ocean, are analysed based on a climatological mean sound speed field. In the upper 30-40 m in the Bay of ... -
Acoustical characteristics and simulated tomographic inversion of a cold core eddy in the Bay of Bengal
(European Acoustics Association, 1997)Acoustic characteristics of a subsurface, cold core eddy observed in the Bay of Bengal during southwest monsoon period is presented based on CTD (Conductivity Temperature Depth) data from 42 stations. The effect of the ... -
Algorithms and interface for ocean acoustic ray-tracing (Developed in MATLAB)
(National Institute of Oceanography, 2005)An integrated friendly-user interactive ocean application package has been developed for computation of eigenrays for a given source - receiver configuration and subsurface and bottom environmental conditions utilizing the ... -
Arc arrays: studies of high resolution techniques for multibeam bathymetric applications
(Elsevier, 1995)In this paper a theoretical study is initiated to observe the utility of directional spectral estimation techniques for `arc array' geometries. We examine the suitability of a 15 degrees arc transducer geometry for multibeam ... -
Inverse problem of Ocean Acoustic Tomography (OAT) - A numerical experiment
(Indian Society of Theoretical and Applied Mechanics, 1994)Acoustic model simulation experiments related to the forward and inverse aspects of ocean tomography have been taken up with a view to estimate the vertical sound speed field by inverting the travel time data. Two methods ...