Browsing Scholarly literature by Subject "ocean floor"
Now showing items 1-20 of 37
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A group of 20 stone anchors from the waters of Dwarka, on the Gujarat Coast, India
(Blackwell, 2001)A large number of stone anchors were discovered in a water depth of 10-14 m off Dwarka during the 1998-99 season. The seabed near the anchors consists of a ledge with an average height of 1 m. Several anchors were found ... -
A neural network based seafloor classification using acoustic backscatter
(Springer-Verlag; Berlin, Heidelberg, 2002)This paper presents a study results of the Artificial Neural Network (ANN) architectures [Self-Organizing Map (SOM) and Multi-Layer Perceptron (MLP)] using single beam echosounding data. The single beam echosounder, operable ... -
A pair of seamount chains in the Central Indian Basin, identified from multibeam mapping
(Taylor and Francis, 1998)Seamounts are major physiographic features on the ocean floor. Their study is important to the understanding of the tectonic history of the seafloor. Over 150 seamounts were identified during the multibeam (Hydrosweep ... -
Acoustic characterization of continental shelf seafloor and benthic habitats using single and multi-beam backscatter data
(Institute of Applied & Computational Mathematics, 2013)Satellite based marine remote sensing is a conventional technique for oceanographic research studies. Likewise, in the future projection application of the acoustic remote sensing using high frequency single-beam echo-sounder ... -
Acoustic characterization of seafloor sediment employing a hybrid method of neural network architecture and fuzzy algorithm
(IEEE, 2009)Seafloor sediment is characterized acoustically in the western continental shelf of India using the echo features extracted from normal incidence single-beam echo sounder backscatter returns at 33 and 210 kHz. The seafloor ... -
An application of the multibeam sounder for seabed backscattering analysis
(Ultrasonics Society of India, 1994)A theoretical analysis of vertical farfield pattern for a multibeam sounder is performed. The farfield pattern for different steered angles establish the usefulness of present multibeam arrays. An interaction effect of ... -
Analysis of multibeam-hydrosweep echo peaks for seabed characterisation
(Springer, 2001)Echo-peak data of outer and normal incidence beams from five different Southern Ocean bottom topographic regions have been analysed. The Rice and Extremal probability density function (PDF) statistical approaches reveal ... -
Assessing the distribution and abundance of seabed minerals from seafloor photographic data in the Central Indian Ocean Basin
(Taylor & Francis, 2013)Distribution characteristics of deep-sea mineral resources such as polymetallic nodules and ferromanganese crusts are often influenced by local seafloor features such as the topographic undulations and sediment thickness. ... -
Assessment of impact on seafloor features in INDEX area
(Taylor and Francis, 2000)Observations on seafloor features from subbottom profiling and seabed photography data show that the undisturbed and natural conditions before the benthic disturbance undergo a substantial change after operation of the ... -
Assessment of impact on seafloor features in INDEX area
(Taylor and Francis, 2000)Observations on seafloor features from subbottom profiling and seabed photography data show that the undisturbed and natural conditions before the benthic disturbance undergo a substantial change after operation of the ... -
Benthic disturbance and impact experiments in the Central Indian Ocean Basin
(Taylor and Francis, 2000)As a part of the Environmental Impact Assessment studies for nodule mining, a long-term program has been initiated in the Central Indian Basin. Multidisciplinary studies on geological, biological, physical and chemical ... -
Contrast in manganese nodule distribution on either side of 79~'E fracture zone in central Indian Basin
(Taylor and Francis, 1994)Seabed topography is one of the prime factors in controlling the distribution of manganese nodules. Study of the nodule abundance on either side of the 79~'E fracture zone in the Central Indian Basin (idenfitied from ... -
Distribution and origin of seamounts in the central Indian Ocean Basin
(Taylor and Francis, 2005)Approximately 200 seamounts of different dimensions have been identified, from multibeam bathymetry maps of the Central Indian Ocean Basin (CIOB) (9 degrees S to 16 degrees S and 72 degrees E to 80 degrees E), of which 61% ... -
Distribution of manganese nodules, rocks and sediments in the Central Indian Ocean Basin: Factors influencing performance of mining system
(Publ. and Inf. Dir., New Delhi, India, 1994)Manganese nodule abundances in the Central Indian Ocean Basin (CIOB) as noted from seabed photographs (nil to 18.4 kg/m sup(2)) and grabs (nil to 21.5 kg/m sup(2)) are variable. The relative abundance varies from zero to ... -
Echo-waveform classification using model and model free techniques: Experimental study results from central western continental shelf of India
(Marine Technology Society, 2005)Seafloor classifications and characterization using acoustic backscatter data from the central western continental shelf of India is presented in this work. Single beam sea-floor echo data using two frequencies: 33 kHz and ... -
Effect of sediment-water interface 'boundary layer' on exposure of nodules and their abundance: a study from seabed photos
(Geological Society of India, 1989)The results obtained from seabed photos and boomerang grab samples reveal a striking similarity in distribution patterns of size classes of polymetallic nodules. Due to partial sediment cover, there is a 'fractionation' ... -
Geochemical evidence of terrigenous influence in deep-sea sediments upto 8°S in the Central Indian basin
(Elsevier, 1989)Thirty-two representative deep-sea sediment samples have been studied from three manganese nodule-bearing environments in the Central Indian Basin: diatomaceous-radiolarian ooze-clay, pelagic brown clay and calcareous ooze. ... -
Growth of the Afanasy Nikitin seamount and its relationship with the 85 degree E Ridge, northeastern Indian Ocean.
(Indian Academy of Sciences, 2014)The Afanasy Nikitin seamount (ANS) is a major structural feature (400 km-long and 150 km-wide) in the Central Indian Basin, situated at the southern end of the so-called 85 degree E Ridge. Combined analyses of new multibeam ... -
Heavy metal tolerance in the psychrotolerant Cryptococcus sp. isolated from deep-sea sediments of the Central Indian Basin
(John Wiley & Sons, 2013)A deep-sea isolate of the psychrotolerant yeast Cryptococcus sp. (NIOCC#PY13) obtained from polymetallic nodule-bearing sediments of the Central Indian Basin was examined for its capacity to grow in the presence of various ... -
Image analysis of seafloor photographs for estimation of deep-sea minerals
(Springer, 2010)Factors such as non-uniform illumination of seafloor photographs and partial burial of polymetallic nodules and crusts under sediments have prevented the development of a fully automatic system for evaluating the distribution ...