Informatics Publishing Limited

Aneesh A. Lotliker ¹, T. Srinivasa Kumar ¹, Venkat Shesu Reddem ¹, Shailesh Nayak ²

Affiliations
1 Indian National Centre for Ocean Information Services, Ocean Valley, Pragathi Nagar (BO), Nizampet (SO), Hyderabad 500 090, IN
2 Earth System Science Organization (ESSO), 'Prithvi Bhavan', Lodhi Road, New Delhi 110 003, IN

Abstract

No Abstract.

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T. M. Balakrishnan Nair ¹, P. G. Remya ¹, R. Harikumar ¹, K. G. Sandhya ¹, P. Sirisha ¹, K. Srinivas ¹, C. Nagaraju ¹, Arun Nherakkol ¹, B. Krishna Prasad ¹, C. Jeyakumar ¹, K. Kaviyazhahu ¹, N. K. Hithin ¹, Rakhi Kumari ¹, V. Sanil Kumar ², M. Ramesh Kumar ¹, S. S. C. Shenoi ¹, Shailesh Nayak ³

Affiliations
1 Information Services and Ocean Sciences Group, ESSO-Indian National Centre for Ocean Information Services, 'Ocean Valley', Pragathi Nagar (BO), Nizampet (SO), Hyderabad 500 090, IN
2 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
3 Earth System Science Organization, New Delhi 110 003, IN

Abstract

Wave fields, both measured and forecast during the very severe cyclone Phailin, are discussed in this communication. Waves having maximum height of 13.54 m were recorded at Gopalpur, the landfall point of the cyclone. The forecast and observed significant wave heights matched well at Gopalpur with correlation coefficient of 0.98, RMS e rror of 0.35 m and scatter index of 14%. Forecasts were also validated in the open ocean and found to be reliable (scatter index < 15%). The study also revealed the presence of Southern Ocean swells with a peak period of 20-22 sec hitting Gopalpur coast along with the cyclone-generated waves.

Keywords

Buoys, Phailin, Tropical Cyclone, Swell, Wave Forecast.

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Harsh Gupta , Shailesh Nayak , Y. J. Bhaskar Rao , R. K. Chadha , B. K. Bansal , D. Srinagesh , N. Purnachandra Rao , Sukanta Roy

Abstract

No Abstract.

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R. Harikumar ¹, T. M. Balakrishnan Nair ¹, B. M. Rao ¹, Rajendra Prasad ², P. Ramakrishna Phani ¹, C. Nagaraju ¹, M. Ramesh Kumar ¹, C. Jeyakumar ¹, S. S. C. Shenoi ¹, Shailesh Nayak ³

Affiliations
1 ESSO-Indian National Centre for Ocean Information Services, Hyderabad 500 090, IN
2 Andhra University, Visakhapatnam 530 003, IN
3 Earth System Science Organisation, New Delhi 110 003, IN

Abstract

Ocean-met observations from INCOIS real-time automatic weather station on-board a ship RV Kaustubh served as strong ground truth for satellite- and modelderived forecasts during the very severe cyclonic storm Hudhud, which made a landfall at Visakhapatnam, India. The ship recorded maximum wind speed of 204 km/h (with a minimum central pressure of 945 hPa), which is the highest (lowest) ever instrumentally recorded value at a location on the Indian coastline during any cyclone. Though the global model forecasts of wind fields have shown good agreement inland, they failed in representing the reality along the coasts. Variation in wind energy from ocean towards inland suggests that it is attenuated exponentially inland (the maximum wind power density had reduced by 93,406 W/m² at Anakapalle (~25 km) compared to the ocean, and by 7022 W/m² at Chintapalle (~100 km inland) compared to Anakapalle). The present study reinforces the significance of having realtime near-shore ocean-met observations, and their operational usage for evaluation (assimilation) of (into) ocean-met forecast models in realtime.

Keywords

Automatic Weather Stations, Bias-Corrected Wind Forecasts, Forecast Models, Tropical Cyclones, Shipbased Observations, Wind Power Density.

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Shailesh Nayak ¹

Affiliations
1 Earth System Science Organisation, Prithvi Bhawan, Lodhi Road, New Delhi 110 003, IN

Abstract

Geoscience deals with the earth system, specifically the geosphere, on which humans and other biota live and depend for water, food and energy requirements. The understanding of dynamic processes within the earth's crust, mantle and core, and their linkages with geophysical observations and processes at the land surface is complex but significant. These processes vary greatly in space from local, regional to global scale and from a few seconds to millions of years in time.

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Subimal Ghosh ¹, Subhankar Karmakar ², Anamitra Saha ¹, Mohit Prakash Mohanty ³, Shees Ali ¹, Satya Kiran Raju ⁴, Vrinda Krishnakumar ¹, Maneesha Sebastian ¹, Manasa Ranjan Behera ¹, R. Ashrit ⁵, P. L. N. Murty ⁶, K. Srinivas ⁶, B. Narasimhan ⁷, Tune Usha ⁴, M. V. Ramana Murthy ⁴, P. Thiruvengadam ¹, J. Indu ¹, D. Thirumalaivasan ⁸, John P. George ⁵, S. Gedam ⁹, A. B. Inamdar ⁹, B. S. Murty ⁷, P. P. Mujumdar ¹⁰, M. Mohapatra ¹¹, Arun Bhardwaj ¹², Swati Basu ¹², Shailesh Nayak ¹³

Affiliations
1 Department of Civil Engineering, Indian Institute of Technology Bombay, Mumbai 400 076, IN
2 Interdisciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Mumbai 400 076, IN
3 Environmental Science and Engineering, Indian Institute of Technology Bombay, Mumbai 400 076, IN
4 National Centre for Coastal Research, NIOT Campus, Velacherry–Tambaram Main Road, Pallikaranai, Chennai 600 100, IN
5 National Centre for Medium Range Weather Forecasting, Ministry of Earth Sciences, Government of India, A-50, Sector-62, Noida 201 309, IN
6 Indian National Centre for Ocean Information Services, Pragathi Nagar (BO), Nizampet (SO), Hyderabad 500 090, IN
7 Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
8 Institute of Remote Sensing, Anna University, Chennai 600 040, IN
9 Centre of Studies in Resources Engineering, Indian Institute of Technology Bombay, Mumbai 400 076, IN
10 Department of Civil Engineering, Indian Institute of Science, Bengaluru 560 012, IN
11 India Meteorological Department, New Delhi 110 003, IN
12 Office of the Principal Scientific Adviser to the Government of India, Vigyan Bhavan Annexe, Maulana Azad Road, New Delhi 110 011, IN
13 National Institute of Advanced Studies, Indian Institute of Science Campus, Bengaluru 560 012, IN

Abstract

Floods are the most common and recurring natural hazards faced by humans since time immemorial. They pose a severe threat to the population, environment and economy in many places across the world, especially urban areas. Urbanization caused due to increasing migration into the floodplains has substantially increased the trend of devastation due to floods in a developing country like India. In Chennai and the surrounding suburban areas, torrential rainfall associated with low-pressure systems engulfed the city during December 2015, affecting more than 4 million people along with economic damages that cost around 3 billion USD.

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Shailesh Nayak ¹

Affiliations
1 National Institute of Advanced Studies, Bengaluru 560 012, IN

Abstract

No Abstarct.

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S. S. C. Shenoi ¹, P. L. N. Murty ¹, Ch. Patanjali Kumar ¹, B. Ajay Kumar ¹, M. V. Sunanda ¹, K. Siva Srinivas ¹, J. Padmanabham ¹, Dipankar Saikia ¹, E. Pattabhi Rama Rao ¹, Shailesh Nayak ¹

Affiliations
1 Indian National Centre for Ocean Information and Services (INCOIS), Ministry of Earth Sciences, Hyderabad 500 090, IN

Abstract

The Indian Tsunami Early Warning System (ITEWS) was established at the Indian National Centre for Ocean Information Services, Hyderabad in October 2007 following the devastating tsunami on 26 December 2004. The Intergovernmental Oceanographic Commission of United Nations Educational, Scientific and Cultural Organization (IOC/UNESCO) coordinated with the National Tsunami Warning Centers in the Indian Ocean region and promoted the establishment of a well-knit tsunami early warning system called Indian Ocean Tsunami Warning and Mitigation System (IOTWMS) so that all countries on the Indian Ocean can get benefitted. The end-to-end capabilities of this warning system have been well-proven during the tsunamigenic earthquakes that occurred since September 2007. The capability of the system is examined, with special reference to Indian Tsunami Early Warning System (ITEWS), to ascertain the readiness of the Indian Ocean region to face a major tsunami.

Keywords

Advisories, Capacity Building, Inundation, Modelling, Tsunami.

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Shailesh Nayak ¹, D. Suba Chandran ¹

Affiliations
1 National Institute of Advanced Studies, Indian Institute of Science Campus, Bengaluru 560 012, IN

Abstract

The Arctic has been receiving a lot of attention recently due to environmental and economic reasons. The continuing reduction of sea ice and sheet ice is likely to affect global climate significantly. It is expected that these changes will affect monsoon as well as inundate our coasts. India has a modest presence in the Arctic, mainly for scientific purposes. The changing Arctic is likely to offer many economic opportunities, especially for ensuring energy security and access to rare earths. India needs to enhance its presence for launching scientific projects to study the interactions between cryosphere, atmosphere and ocean in order to understand long-term impacts on the country. It is essential that India defines its strategy as well as a policy for the Arctic in the near future and contributes towards generating strategic knowledge for the region. Such knowledge will help ensure food, energy and resource security for the country.

Keywords

No Keywords.

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Shailesh Nayak ¹

Affiliations
1 National Institute of Advanced Studies, Bengaluru 560 012, IN

Abstract

No Abstract.

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Shailesh Nayak ¹, Shalini Dixit ¹

Affiliations
1 National Institute of Advanced Studies, Indian Institute of Science Campus, Bengaluru 560 012, India

Abstract

No Abstract.

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Shailesh Nayak ¹

Affiliations
1 National Institute of Advanced Studies, Indian Institute of Science Campus, Bengaluru 560 012, India., IN

Abstract

No Abstract.

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