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Match beam inversion of geoacoustic parameters from towed hydrophone streamer array data

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Title Match beam inversion of geoacoustic parameters from towed hydrophone streamer array data
 
Creator Naithani, Sanjeev
Kumar, P.V. Hareesh
Kumar, N. Suresh
 
Subject Geoacoustic inversion
Shallow water
Beamform
 
Description 183-194
The study estimates
geoacoustic parameters of the sediment by inversion of acoustic data acquired
from seismic hydrophone streamer array. 
Inversion is performed by beamforming technique as the data is
pertaining to shallow water and there is no prior information on the sediment
type and the profiles of subbottom sediment layers. Initially, the estimates of
sediment speed are obtained from critical angle derived from beamformer output
by conventional beamforming. The sediment speed is used to set the parameter
search bounds for further inversion by beamforming technique. The search bounds
for density and compressional attenuation coefficient is set accordingly. The
feasibility of inversion is understood by undertaking synthetic runs followed
by inversion of field data. The beam cutoff angles are determined from the
beampattern and the arrivals pertaining to the sea bottom.  The geoacoustic model comprises of a water
column, two sediment layers and a sediment half space.  The inversion results of field data sets are
compared with results obtained by modal inversion. The results show negligible
variation in estimated sound speed indicating similar sediment type. The
sediment density and compressional attenuation coefficient exhibits lesser
sensitivity toward inversion process.
 
Date 2016-07-04T08:30:32Z
2016-07-04T08:30:32Z
2015-02
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34631
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.44(02) [February 2015]