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Ramadass, G. A.

Application of Indigenously Developed Remotely Operated Vehicle for the Study of Driving Parameters of Coral Reef Habitat of South Andaman Islands, India

Abstract Views :204 | PDF Views:98

Authors

S. Ramesh ¹, G. A. Ramadass ¹, V. Doss Prakash ¹, C. S. Sandhya ¹, R. Ramesh ¹, D. Sathianarayanan ¹, N. V. Vinithkumar ²

Affiliations
1 National Institute of Ocean Technology (NIOT), Ministry of Earth Sciences, Government of India, Chennai 600 100, IN
2 Andaman and Nicobar Centre for Ocean Science and Technology, NIOT, Port Blair 744 103, IN

Source

Current Science, Vol 113, No 12 (2017), Pagination: 2353-2359

Abstract

Coral reef biodiversity in South Andaman Islands, India was studied using indigenously developed remotely operated underwater vehicle, PROVe. The vehicle was manoeuvred in coral reef habitats using underwater navigational aids to record faunal assemblages along with underwater spatio-temporal spectral irradiance characteristics coupled with surface radiance, water temperature, salinity and underwater visuals by high-definition camera devices. PROVe-based observations and the outcome from scientific payloads indicated that it will be a new additional tool for the Indian scientific community to map coral reef habitats, correlate and validate the satellite-derived parameters to understand coral reef health.

Keywords

Coral Reef, Driving Parameters, Remotely Operated Vehicle, Spectral Irradiance.

Full Text

References

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Gas-Hydrates in Krishna-Godavari and Mahanadi Basins: New Data

Abstract Views :209 | PDF Views:0

Authors

Kalachand Sain ¹, Maheswar Ojha ¹, Nittala Satyavani ¹, G. A. Ramadass ², T. Ramprasad ³, S. K. Das ⁴, Harsh Gupta ¹

Affiliations
1 CSIR - National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007, IN
2 National Institute of Ocean Technology, Velachery-Tambaram Main Road, Chennai - 600 100, IN
3 CSIR-National Institute of Oceanography, Dona Paula, Goa - 403 004, IN
4 Ministry of Earth Sciences, Prithvi Bhavan, Lodhi Road, New Delhi - 110 003, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 6 (2012), Pagination: 553-556

Abstract

Gas-hydrates are crystalline substances consisting of mainly methane and water, and occur in shallow sediments of outer continental margins and permafrost regions. They are formed at high pressure and low temperature regime when supply of methane gas exceeds the solubility limit. Unlike natural gas, oil and minerals, gas-hydrates are not stable at standard temperature and pressure (STP). One volume of gas-hydrates, when dissociated, releases 164 volumes of methane at STP. Since methane is the lowest molecular weight hydrocarbon, use of gas-hydrates as fuel will cause less pollution to the environment. These have attracted the global attention due to their natural occurrences in abundance and huge energy potential. The methane locked as gas-hydrates is envisaged as 1-120 x 10¹⁵ m³ (Boswell and Collett, 2011). Only 15% recovery from this gigantic reserve may be sufficient to meet the global energy requirement for about 200 years (Makogon et al. 2007). Thus, gas-hydrates seem to be a viable major energy resource of future, and have been identified globally either by geophysical, geochemical and geological surveys or by drilling and coring (Boswell and Saeki, 2011; Ruppel, 2011; Sain and Gupta, 2012). Besides having the energy potential, the study of gas-hydrates is also important from natural hazards point of view related to seafloor subsidence, slumps and slides (Gupta and Sain, 2011).

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References

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Unmanned Underwater Vehicles: Design Considerations and Outcome of Scientific Expeditions

Abstract Views :248 | PDF Views:82

Authors

G. A. Ramadass ¹, S. Ramesh ¹, N. Vedachalam ¹, A. N. Subramanian ¹, D. Sathianarayanan ¹, R. Ramesh ¹, G. Harikrishnan ¹, T. Chowdhury ¹, V. B. N. Jyothi ¹, S. B. Pranesh ¹, V. Doss Prakash ¹, M. A. Atmanand ¹

Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN

Source

Current Science, Vol 118, No 11 (2020), Pagination: 1681-1686

Abstract

In India, scientific investigations of ocean basins have been in progress for more than five decades using indirect and direct measurement devices. These studies were aimed at resource identification, ecological, palaeo-oceanographic and palaeo-climatic research. To cater to the need of the ocean community, Remotely Operated Vehicles (ROV) rated for 6000 m (ROSUB 6000) and 500 m (PROVe-500) operational depths have been developed at the National Institute of Ocean Technology, MoES, Chennai. This article reports the design considerations for unmanned remotely operated underwater vehicles and the outcome of scientific expeditions conducted for deep sea mineral exploration, ocean biodiversity and polar science.

Keywords

Biodiversity, Ocean Resources, Remotely Operated Vehicle.

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Ramesh, R., BalanagaJyothi, V., Vedachalam, N., Ramadass, G. A. and Atmanand, M. A., Development and performance validation of navigation system for an underwater vehicle. J. Navigation, 2016, 69, 1097–1113.

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Challenges in Developing Deep-Water Human Occupied Vehicles

Abstract Views :264 | PDF Views:148

Authors

G. A. Ramadass ¹, N. Vedachalam ¹, S. Ramesh ¹, D. Sathianarayanan ¹, A. N. Subramanian ¹, R. Ramesh ¹, T. Chowdhury ¹, S. B. Pranesh ¹, M. A. Atmanand ¹

Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN

Source

Current Science, Vol 118, No 11 (2020), Pagination: 1687-1693

Abstract

Human occupied vehicles (HOV) offer enhanced manoeuvering over the remotely operated vehicles and autonomous underwater vehicles. The presence of human increases the dexterity of the HOV operations, but at the same time, the man-rated vehicle design and operation requires significant attention to vehicle reliability, and in turn human safety. This article details the challenges involved in the design and development of deep water HOV, with specific reference to the 6000 m depth-rated HOV designed by the MoES– National Institute of Ocean Technology for enhancing India’s engineering capability in the deep ocean scientific research.

Keywords

Ballast, Batteries, Deep Ocean, Human Occupied Vehicle, Navigation.

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Vedachalam, N., Ramesh, R., Jyothi, V. B. N., Doss Prakash, V. and Ramadass, G. A., Autonomous underwater vehicles – challenging developments and technological maturity towards strategic swarm robotics systems. Mar. Georesour. Geotechnol., 2018; doi.org/10.1080/1064119X.2018.1453567.

Design and Development of Human Metabolic Simulator for a Deepwater Manned Submersible

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Authors

C. S. Sandhya ¹, S. Ramesh ¹, N. Thulasi Prasad ¹, K. N. V. V. Murthy ¹, D. Gobichandhru ¹, M. Murugesan ¹, N. Vedachalam ¹, G. A. Ramadass ¹

Affiliations
1 Deep-Sea Technologies Group, National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN

Source

Current Science, Vol 122, No 2 (2022), Pagination: 187-194

Abstract

In order to cater to the scientific demand for deep ocean exploration with human presence, manned submersible capable of operating up to 6000 m depth is being designed and developed at National Institute of Ocean Technology. The submersible can accommodate three personnel inside the confined space volume of 4.8 m³ human capsule (personnel sphere) for total endurance of 108 h (12 h normal mission and 96 h in case of emergency). Human Metabolic Simulator was developed by following Det Norske Veritas guideline to validate the life support system design during initial stages of qualification inside the personnel sphere. By considering human respiratory quotient (RQ), HMS was designed by combusting propane gas (RQ 0.6) to produce carbon dioxide, water and heat

Keywords

Human Metabolic Simulator, Life Support System, Manned Submersible, Personnel Sphere, Respiratory Quotient.

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Ramadass, G. A.

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