Browsing Institute's contributions by Author "Chakraborty, B."
Now showing items 41-60 of 92
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Fine-scale analysis of shelf -slope physiography across the western continental margin of India
Chakraborty, B.; Mukhopadhyay, R.; Jauhari, P.; Mahale, V.; Shashikumar, K.; Rajesh, M. (Springer-Verlag, 2006)We attempt here to quantify and model physiographic phenomena off the central west coast of India in terms of power spectral exponent, amplitude parameter. The statistical analysis of the multibeam echosounder grid bathymetry ... -
Fish Sound Characterization Using Multifractal Detrended Fluctuation Analysis
Chanda, K.; Shet, S.; Chakraborty, B.; Saran, A.K.; Fernandes, W.A.; Latha, G. (World Scientific Pub Co Pte Lt, 2020)This work involves the application of a non-linear method, multifractal detrended fluctuation analysis (MFDFA), to describe fish sound data recorded from the open waters of two major estuarine systems. Applying MFDFA, the ... -
How biological (fish) noise affects the performance of shallow water passive array system
Fernandes, W.A.; Chakraborty, B.; Haris, K.; Vijayakumar, K.; Sundar, D.; Luis, R.A.A.; Mahanty, M.M.; Latha, G. (NIOT, Chennai, 2015)Passive acoustic data off Grand Island, Goa were acquired using a single wideband hydrophone system deployed at the water depth of ~20.5 m during the month of April, 2014. The 4- elements hydrophone array with an aperture ... -
Humpback whale singing activity off the Goan coast in the Eastern Arabian Sea
Madhusudhana, S.K.; Chakraborty, B.; Latha, G. (2019)For over two decades, passive acoustic monitoring (PAM) methods have been successfully employed around the world for studying aquatic megafauna. PAM-driven studies in Indian waters have so far been relatively very scarce. ... -
Imaging trench-line disruptions: Swath mapping of subduction zone
Chakraborty, B.; Mukhopadhyay, R. (Indian Academy of Sciences, 2006)Analogous to other subduction zones in the world where the heavier oceanic plate shoves below the lighter continental plate, crustal movement along the Sumatra–Andaman trench line over the last two centuries released ... -
Mapping and analyses of two coralline banks in the western continental margin of India using multibeam echosounder data
Menezes, A.A.A.; Mahender, K.; Chakraborty, B.; Fernandes, W.A.; Vardhan, Y.V.; Kurian, J. (NISCAIR-CSIR, India, 2018)Six and eleven profiles of bathymetric and backscatter data are drawn from the gridded (rasterized) maps of the two banks, the Gaveshani Bank and another, an unnamed bank (at latitude 13 0 43.5' N, longitude 73 0 42' E) ... -
Model-based acoustic remote sensing of seafloor characteristics
De, Ch.; Chakraborty, B. (IEEE, 2011)The characterization of seafloor sediments by acoustic means is carried out using normal-incidence, dual-frequency, single-beam echo sounder backscatter data at 20 locations in the western continental shelf of India. A ... -
Model-based seafloor characterization employing multi-beam angular backscatter data - A comparative study with dual-frequency single beam
Haris, K.; Chakraborty, B.; De, C.; Desai, R.G.P.; Fernandes, W.A. (Acoustical Society of America, 2011)Sediment geoacoustic inversion results are estimated employing a multi-beam (MB) echo-sounding system operable at 95 kHz. To characterize the western continental shelf of India (off Goa) seafloor, MB backscatter signals ... -
Morphology of pockmarks along the western continental margin of India: Employing multibeam bathymetry and backscatter data
Dandapath, S.; Chakraborty, B.; Karisiddaiah, S.M.; Menezes, A.A.A.; Ranade, G.; Fernandes, W.A.; Naik, D.K.; PrudhviRaju, K.N. (Elsevier, 2010)This study addresses the morphology of pockmarks along the western continental margin of India using multibeam bathymetry and backscatter data. Here, for the first time we have utilized the application of ArcGIS (Geographical ... -
Multi-beam backscatter image data processing techniques employed to EM 1002 system
Fernandes, W.A.; Chakraborty, B. (CUSAT, 2009)Application of multi-beam bathymetric data provides interesting seafloor features. Besides obtaining bathymetric data for seabed characterization backscatter data is also important. However, use of raw multi-beam backscatter ... -
Multibeam echosounder pseudo sidescan images as a tool for manganese nodule exploration
Kodagali, V.N.; Chakraborty, B. (International Society of Offshore and Polar Engineers, Cupertino, CA (USA), 1999)Deep ocean floor is the storehouse of vast quantities of mineral resources and manganese nodules are one of the important resources. The method of semi quantitative evaluation of nodule resource estimation using the rms ... -
Multifractal approach for seafloor characterization
Chakraborty, B.; Haris, K.; Latha, G.; Maslov, N.; Menezes, A.A.A. (IEEE, 2014)This letter involves multifractal characterization of pockmark seepage associated seafloor along the central part of the western continental margin of India. Six representative blocks of backscatter and bathymetry coregistered ... -
Multifractal detrended fluctuation analysis to characterize phase couplings in seahorse (Hippocampus kuda) feeding clicks.
Haris, K.; Chakraborty, B.; Menezes, A.A.A.; Sreepada, R.A.; Fernandes, W.A. (Acoustical Society of America, 2014)Nonlinear phenomena in animal vocalizations fundamentally includes known features, namely, frequency jump, subharmonics, biphonation, and deterministic chaos. In the present study, the multifractal detrended fluctuation ... -
Multifractal detrended fluctuation analysis to compare coral bank and seafloor seepage area-related characterization along the central Western continental margin of India
Chakraborty, B.; VishnuVardhan, Y.; Haris, K.; Menezes, A.A.A.; Karisiddaiah, S.M.; Fernandes, W.A.; Kurian, J. (IEEE, 2016)In this letter, the characterization of two coral banks is initiated employing the multifractal detrended fluctuation analysis (MFDFA) for multibeam bathymetry and associated backscatter data. The seafloor roughness was ... -
Mutual interaction effects between array elements at different wavelengths in a coaxial circular array
Chakraborty, B. (Acoustical Society of America, 1988) -
Nodule bottom backscattering study using multibeam echosounder
Chakraborty, B.; Raju, Y.S.N.; Nair, R.R. (CUSAT, Kochi, 1992)A study is carried out to observe the angular dependence of backscattering strength at nodule area where grab sample and photographic data is available. Theoretical study along with the experimentally observed data shows ... -
Optimal estimation of ship's attitudes for beampattern corrections in a coaxial circular array
Chakraborty, B.; Dev, K.K. (Taylor and Francis, 1994)A study is conducted to estimate the accurate attitude of a ship's motion and the estimation is used to arrive at the corrections required for a farfield pattern of a coaxial circular array. The relevant analytical expression ... -
Passive acoustic metrics to understand shallow water biodiversity off Malvan area in the west coast of India
Chanda, K.; Chakraborty, B.; Vardhan, Y.V.; Gracias, D.; Mahanty, M.M.; Latha, G.; Fernandes, W.A.; Chaubey, A.K. (NISCAIR, 2020)Underwater soundscape monitoring is an effective method to understand the biodiversity of an ecosystem. In this context, quantitative characterization of shallow water soundscape of the Burnt Island located off Malvan area ... -
Performance appraisal of multibeam system - Hydrosweep at different seabed provinces
Kodagali, V.N.; Chakraborty, B. (New Delhi: Publications and Information Directorate, 1994)The performance of the multibeam sounding system (hydrosweep system) has been assessed at three varying zones of the seabed-continental shelf, continental slope, and deepsea seamount areas. Statistical studies were performed ... -
Preference of echo features for classification of seafloor sediments using neural networks
De, C.; Chakraborty, B. (Springer, 2010)Selection of a set of dominant echo features to classify seafloor sediments using a multilayer perceptron neural network is investigated at two acoustic frequencies (33 and 210 kHz). Several sets of inputs with different ...