Refine your search
Collections
Co-Authors
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Sivakholundu, K. M.
- A New Archaeological Find in the Gulf of Cambay, Gujarat
Abstract Views :211 |
PDF Views:152
Authors
R. V. Karanth
1,
S. Kathiroli
2,
S. Badrinarayanan
2,
D. Venkata Rao
2,
S. N. Rajaguru
2,
K. M. Sivakholundu
2,
B. Sasisekaran
2
Affiliations
1 Department of Geology, M.S. University of Baroda, Vadodara - 390 002, IN
2 National Institute of Ocean Technology, Chennai-600 031, IN
1 Department of Geology, M.S. University of Baroda, Vadodara - 390 002, IN
2 National Institute of Ocean Technology, Chennai-600 031, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 2 (2003), Pagination: 240-241Abstract
No Abstract.Full Text
- A New Archaeological Find in the Gulf of Cambay, Gujarat
Abstract Views :181 |
PDF Views:2
Authors
S. Kathiroli
1,
S. Badrinarayanan
1,
D. Venkata Rao
1,
S. N. Rajaguru
2,
K. M. Sivakholundu
1,
B. Sasisekaran
1
Affiliations
1 National Institute of Ocean Technology, Chennai - 600 036, IN
2 Deccan College, Pune - 411 006, IN
1 National Institute of Ocean Technology, Chennai - 600 036, IN
2 Deccan College, Pune - 411 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 4 (2002), Pagination: 419-428Abstract
Detailed underwater surveys carried out in the Gulf of Cambay, about 20 km west of Hazira, deploying side scan sonar and sub bottom profiler brought to light, the presence of a submerged palaeochannel traceable to a length of 9 km. Associated with this on either side are basement like features found in a grid pattern at water depths of 20-40 m. Sub-surface sampling carried out with dredge and grab sampler revealed stone artefacts, potsherds, hearth pieces, animal bones and human teeth embedded in fluvial sands and silts. In the upper part of the deposit, a carbonised wooden log was found and dated to around 9500 years BP by 14C method. Marine magnetic survey carried-out does not indicate the presence of any major metallic debrislobjects. This appears to be one of the early records of prehistoric human activity of early Holocene age in the marine environment of India.Keywords
Marine Archaeology, Holocene, Palaeo Channel, Side Scan Sonar, Sub Bottom Profiler, Carbon Dating, Artefacts, Gulf of Cambay.
- Surface Current and Wave Measurement during Cyclone Phailin by High Frequency Radars along the Indian Coast
Abstract Views :288 |
PDF Views:93
Authors
Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Science, Chennai 600 100, IN
1 National Institute of Ocean Technology, Ministry of Earth Science, Chennai 600 100, IN
Source
Current Science, Vol 108, No 3 (2015), Pagination: 405-409Abstract
Cyclone Phailin originated in the east central Bay of Bengal (BoB) and crossed into the Indian mainland after traversing through the BoB. High frequency radar (HFR) operated by the National Institute of Ocean Technology could track the surface currents and high wave activity within its measuring limits. The radar data provide valuable information on the surface dynamics during the cyclone period. The HFR observations compare well with those of wave rider buoy. This opens up opportunities for observing the wave conditions during the cyclonic period over longer distances from the shore. This method is relatively more robust as HFR is less likely to be disrupted due to the passage of cyclones, unlike moored systems.Keywords
Coastal Currents, Cyclone, Waves, High Frequency Radar, Remote Sensing.Full Text
- Seasonal Variation in Nearshore Wave Characteristics off Cuddalore, Southeast Coast of Tamil Nadu, India
Abstract Views :222 |
PDF Views:97
Authors
Affiliations
1 Coastal and Environmental Engineering Division, National Institute of Ocean Technology, Pallikaranai, Chennai 600 100, IN
1 Coastal and Environmental Engineering Division, National Institute of Ocean Technology, Pallikaranai, Chennai 600 100, IN
Source
Current Science, Vol 112, No 10 (2017), Pagination: 2115-2121Abstract
Wave data collected using wave rider buoy between January 2010 and January 2011 off Cuddalore coast, Tamil Nadu, India, have been analysed season-wise in this study. Wave steepness method was used for the separation of sea and swell wave parameters. Also parameters such as significant wave height of total wave, sea and swell (Hs, Hsw and Hss), zero crossing periods (Tz, Tsw and Tss) and mean wave directions (θ, θsw and θss) have been studied. The study shows a distinct shift in sea wave direction of about 90° between June and October as well as November and February. Throughout the year, the predominant swell direction remained around 135°. The contribution in total Hs by Hsw was 76% and the remaining 24% by Hss in the yearly cycle. The sea wave height was dominant by more than 90% during November to May. Regression analysis showed good positive Pearson's correlation of 0.94 between Hs and Hsw; however, it was 0.65 between Hs and Hss. The maximum and significant wave heights of 5.7 and 2.7 m were recorded during cyclone Jal on 7 November 2010.Keywords
Regression Analysis, Seasonal Variation, Spectral Energy Density, Wave Characteristics.Full Text
References
- Earle, M. D., Development of algorithms for separation of sea and swell. US National Data Buoy Center Technical Report MEC-87-153, 1984.
- Semedo, A., Suselj, K., Ruthersson, A. and Sterl, A., A global view on the wind sea and swell climate and variability from ERA-40. J. Climate, 2011, 24, 1461–1479.
- Wang, W. D. and Hwang, P. A., An operational method for separating wind sea and swell from Ocean wave spectra. J. Atmos. Oceanic Technol., 2001, 18, 2052–2062.
- Sanil Kumar, V., Pathak, K. C., Pednekar, P., Raju, N. S. N. and Gowthaman, R., Coastal processes along the Indian coastline. Curr. Sci., 2006, 91, 530–536.
- Mishra, P., Patra, S. K., Ramana Murthy, M. V., Mohanty, P. K. and Panda, U. S., Interaction of monsoonal wave, current and tide and their impact on beach profiles – a case study at Gopalpur, east coast of India. Nat. Hazards, 2011, 59, 1145–1159.
- Johnson, G., Sanil Kumar, V. and Balakrishnan Nair, T. M., Monsoon and cyclone induced wave climate over the near shore waters off Puduchery, south western Bay of Bengal. Ocean Eng., 2013, 72, 277–286.
- Sanil Kumar, V., Dubhashi, K. K. and Balakrishnan Nair, T. M., Wave spectral characteristics off Gangavaram, East coast of India. J. Oceanogr., 2014, 70, 307–321.
- Sanil Kumar, V., Anand, N. M., Kumar, K. A. and Mandal, S., Multi peakedness and groupiness of shallow water waves along Indian coast. J. Coastal Res., 2003, 19(4), 1052–1065.
- Aboobacker, V. M., Vethamony, P., Sudheesh, K. and Rupali, S., Spectral characteristics of the nearshore waves off Paradip, India during monsoon and extreme events. Nat. Hazards, 2009, 49(2), 311–323.
- Suresh, R. R. V., Annapurnaiah, K., Reddy, K. G., Lakshmi, T. N. and Balakrishnan Nair, T. M., Wind sea and swell characteristics off east coast of India, during southwest monsoon. Int. J. Oceans Oceanogr., 2010, 4, 35–44.
- Gowthaman, R., Sanil Kumar, V., Dwarakish, G. S., Mohan, S. S., Jai Singh and Ashok Kumar, K., Waves in Gulf of Mannar and Palk Bay around Dhanushkodi, Tamil Nadu, India. Curr. Sci., 2013, 104(10), 1431–1435.
- Aboobacker, V. M., Rashmi, R., Vethamony, P. and Menon, H. B., On the dominance of pre-existing swells over wind seas along west coast of India. Cont. Shelf Res., 2011, 31, 1701–1712.
- Catalogue of Indian Charts Electron Navigation Charts (ENCs) and Publications, National Hydrographic Office, Chart number3003, Dehradun, 2012.
- Datawell, B. V., Datawell Wave Rider Reference Manual, Datawell BV, The Netherlands, 2006.
- Gilhousen, D. B. and Hervey, R., Improved estimates of swell from moored buoys. Proceedings of the 4th International Symposium WAVES 2001, ASCE: Alexandria, Virginia, USA, 2001, pp. 387–393.
- Patra, S. K. and Jena, B. K., Wave characteristics during severe cyclonic storm Jal, along east coast of India. WMO International Conference on Indian Ocean Tropical Cyclones and Climate Change (IOTCCC-2012) New Delhi, WWRP 2013–04, 2012, pp. 152–159.
- Patra, S. K. et al., Cyclone and monsoonal wave characteristics of northwestern Bay of Bengal: long-term observations and modeling. Nat. Hazards, 2016, 82, 1051–1083.
- Ranga Rao, V., Ramana Murthy, M. V., Bhat, M. and Reddy, N. T., Littoral sediment transport and shoreline changes along Ennore on the southeast coast of India: field observations and numerical modelling. Geomorphology, 2009, 112, 158–166.
- Mohanty, P. K. et al., Impact of groins on beach morphology: a case study near Gopalpur Port, east coast of India. J. Coastal Res., 2012, 28, 132–142.