Browsing Institute's contributions by Subject "acoustic tomography"
Now showing items 1-17 of 17
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Acoustic propagation within a surface duct in the western Bay of Bengal
(CSIR-NISCAIR, 1994)Sound speed structure forms a surface duct in the upper 50 m layer in the western Bay of Bengal during late July. A range-dependent acoustic ray computation shows that some rays emanating from a source within the upper 30 ... -
Acoustic propagational characteristics and tomography studies of the northern Indian Ocean
(Narosa, New Delhi (India), 1997)The results of the acoustic tomographic studies carried out in five sections of the Northern Indian Ocean is given. The characteristics of the sound speed field of the northern Indian Ocean comprising of the Arabian Sea ... -
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 remote sensing of ocean flows
(Narosa, New Delhi (India), 1997)Acoustic techniques have become powerful tools for measurement of ocean circulation mainly because of the ability of acoustic signals to travel long distances in water, and the inherently non-invasive nature of measurement. ... -
Acoustic tomography experiment in the eastern Arabian Sea
(European Acoustics Association, 1999)An acoustic transmission experiment was conducted in the eastern Arabian Sea along 12.5 degrees N latitude for a duration of ten days (2-12 May, 1993), with two transceiver systems deployed on deep sea moorings, separated ... -
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 ... -
An algorithm for determination of geodetic path for application in long-range acoustic propagation
(NIO, Goa, 1993)A computer program has been developed for the construction of geodetic path between two points on the spheroidal surface for application in long range acoustic propagation in the ocean. Geodetic equations have integrated ... -
Canonical sound speed profile for the central Bay of Bengal
(Indian Academy of Sciences, Bangalore, 1989)Following Munk's canonical theory, an algorithm has been presented for computing sound channel parameters in the western and southern Bay of Bengal. The estimated canonical sound speed profile using these parameters has ... -
Hydrographic characteristics of central Bay of Bengal waters during southwest monsoon of 1983
(CSIR-NISCAIR, 1987)During cruises 120 and 124 of R V Gaveshani two sections, viz. Visakhapatnam - Port Blair and Madras - Port Blair, in Bay of Bengal have been covered twice. The sea surface temperature (SST) shows a decrease of about 2 ... -
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 ... -
Numerical simulation and measurements of acoustic transmissions from Heard Island to the equatorial Indian Ocean
(NISCAIR, CSIR, 1996)Simulated acoustic propagation showed a gradual deepening of the ray paths from the southern ocean towards tropics. Also the axis of the sound channel deepens from 150 m to 1600 m. Sudden jumps were noticed in the acoustic ... -
Objective mapping of temperature field by stochastic inverse method using acoustic tomography experimental data of eastern Arabian Sea
(School of Naval Oceanology and Meteorology, 2007)An acoustic transmission experiment was conducted in the eastern Arabian Sea along 12.5 degrees N latitude for a duration of ten days (2-12 May, 1993), with two transceiver systems deployed on deep sea moorings, separated ... -
Preliminary results of an acoustic tomography experiment (ATE-93) in the eastern Arabian Sea
(Office for Official Publications of the European Communities, 1994)An acoustic transmission experiment was conducted in the eastern Arabian Sea by deploying two transceiver systems on deep sea moorings separatEd. by 270 km. The experiment lasted for a duration of ten days (2-12 May 1993). ... -
Reference sound speed profile and related ray acoustics of Bay of Bengal for tomographic studies
(European Acoustics Association, 1994)Using the archived hydrographic data, a climatological mean sound speed profile has been developed for the Bay of Bengal which will serve as an input (reference profile) to acoustic models. This profile is depth limited ... -
Sound field computations in the Bay of Bengal using parabolic equation method
(NISCAIR, CSIR, 1996)Effect of the cold core eddy in the Bay of Bengal on acoustic propagation was analysed by parabolic equation (PE) method. Source depth, frequency and propagation range considered respectively for the two numerical experiments ... -
Sound speed structure in the Arabian Sea and the Bay of Bengal
(NISCAIR, New Delhi, 1993)Sound speed computed from annual mean temperature and salinity data of Levitus reveals that spatial variation in the Arabian Sea is greater than that in the Bay of Bengal. Maximum spatial variation of sound speed in the ...