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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 (H_s, H_sw and H_ss), zero crossing periods (T_z, T_sw and T_ss) and mean wave directions (θ, θ_sw and θ_ss) 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 H_s by H_sw was 76% and the remaining 24% by H_ss 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 H_sw; however, it was 0.65 between H_s and H_ss. 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.

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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.

Simulated Wave Climate and Variability Over the North Indian Ocean

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Authors

Basanta Kumar Jena ¹, J. Rajkumar ¹, Aruna Kumar Avula ¹, K. Jossia Joseph ¹, M. V. Ramana Murthy 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: 1746-1752

Abstract

The wave parameters and long-term statistics of wave height are important parameters required for coastal/ offshore engineering design and analysis. The 20-year wave simulation has been carried out using MIKE-21 spectral wave model developed by the Danish Hydraulic Institute. The model was forced with the wind data from ECMWF operational archive wind data from 1998 to 2017. The MIKE C-MAP bathymetry data for less than 250 m depth in the North Indian Ocean and ETOPO1 for above 250 m depth were utilized for model bathymetry. The wave measurements available at various depths in the North Indian Ocean were utilized to validate model result. Wave parameters extracted at 27 locations at an interval of 1 degree at 25 m water depth were used for showing monthly variability of significant wave height, average wave period and mean wave direction. The extreme value analysis of significant wave height was carried out using Weibull analysis for 2, 5, 20 and 50 years return period. The maximum wave height of 5.7 m near Odisha coast in 50 years return period was calculated from the extreme value analysis.

Keywords

Extreme Value Analysis, Numerical Model, Wave Direction, Wave Height, Wave Period.

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References

Chandramohan, P., Sanilkumar, V., Nayak, B. U. and Anand, N. M., Wave Atlas for the Indian Coast, National Institute of Oceanography, Goa, 1991.

Chin, T. M., Milliff, R. F. and Large, W. G., Basin-scale highwave number sea surface wind fields from multi-resolution analysis of scatterometer data. J. Atmos. Ocean Technol., 1998, 15, 741–763.

Sterl, A. and Caires, S., Climatology, variability and extrema of ocean waves – the web-based KNMI/ERA-40 wave atlas. Int. J. Climatol., 2005, 25(7), 963–997; doi:10.1029/joc.1175.

Taebi, S., Golshani, A. and Chegini, V., An approach towards wave climate study in the Persian Gulf and the Gulf of Oman: simulation and validation. J. Mar. Eng., 2008, 4(7), 2008.

Zhang, H. M., Reynolds, R. W. and Bates, J. J., Blended and gridded high resolution global sea surface wind speed and climatology from multiple satellites: 1987 – Present. In 2006 Annual Meeting, American Meteorological Society, Atlanta, GA, 29 January–2 February 2006.

Barstow, S. et al., World waves: fusion of data from many sources in a user-friendly software package for timely calculation of wave statistics in global coastal waters. In 13th International Offshore and Polar Engineering Conference, ISOPE2003, Honolulu, Hawaii, USA, 2003.

Young, I. R. and Holland, G. J., Atlas of the Oceans: Wind and Wave Climate, Pergamon, 1996.

Vethamony, P., Rao, L. V. G., Rajkumar, Sarkar, A., Mohan, M. Sudheesh, K. and Karthikeyan, S. B., Wave climatology of the Indian Ocean derived from altimetry and wave model. In PORESEC Proceedings, Goa, India, 5–8 December 2000, vol. 1, pp. 301–304.

Sivakholundu, K. M., Jossia, K. and Jena, B. K., Wave Atlas of the Indian Coast, ESSO-NIOT, ISBN:81-901338-4-5.

MIKE 21 Spectral Wave Model User Guide, 2011.

Differential Upper Ocean Response Depicted in Moored Buoy Observations during the Pre-Monsoon Cyclone Viyaru

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Authors

R. Venkatesan ¹, K. Jossia Joseph ¹, C. Anoopa Prasad ¹, M. Arul Muthiah ¹, S. Ramasundaram ¹, P. Murugesh 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: 1760-1767

Abstract

The pre-monsoon cyclone Viyaru in the Bay of Bengal during May 2013 traversed a long track from 5°N to 22°N over 7 days with basin-wide response, which was well captured by the time series observations of OMNI buoy network along with satellite data. The differential upper ocean characteristics and its variable response reveal that vertical mixing override horizontal advection during cyclone passage. This study provides insight into the variability in wave spectra, differential response on either side of the track and presence of cold core eddy combined with a thick barrier layer in modulating the upper ocean response.

Keywords

Bay Of Bengal, Barrier Layer, Cyclone Viyaru, Eddies, OMNI Buoys, Wave Spectra.

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References

Alam, Md. M., Hossain, Md. A. and Shafee, S., Frequency of Bay of Bengal cyclonic storms and depressions crossing different coastal zones. Int. J. Climatol., 2003, 23, 1119–1125.

Akter, N. and Tsuboki, K., Role of synoptic-scale forcing in cyclogenesis over the Bay of Bengal. Clim. Dyn., 2014, 43, 2651–2662.

Premkumar, K., Ravichandran, M., Kalsi, S., Sengupta, D. and Gadgil, S., First results from a new observational system over the Indian Seas. Curr. Sci., 2000, 78(03), 323–330.

Venkatesan, R. et al., In situ ocean subsurface time-series measurements from OMNI buoy network in the Bay of Bengal. Curr. Sci., 2013, 104, 1166–1177.

Maneesha, K., Murty, V. S. N., Ravichandran, M., Lee, T., Yu, W. and McPhaden, M. J., Upper ocean variability in the Bay of Bengal during the tropical cyclones Nargis and Laila. Prog. Oceanogr., 2012, 106, 49–61.

Obasi, G. O. P., WMO’s programme on tropical cyclone. Mausam, 1997, 48, 103–112.

McPhaden, M. J. et al., Ocean–atmosphere interactions during cyclone Nargis. EOS Trans. Am. Geophys. Union, 2009, 90, 53– 54.

Vissa, N. K., Satyanarayana, A. N. V. and Prasad Kumar, B., Response of upper ocean during passage of MALA cyclone utilizing ARGO data. Int. J. Appl. Earth Obs. Geoinf., 2012, 14, 149–159.

Gopalakrishna, V. V., Murty, V. S. N., Sarma, M. S. S. and Sastry, J. S., Thermal response of upper layers of Bay of Bengal to forcing of a severe cyclonic storm: a case study. Indian J. Geo-Mar. Sci., 1993, 22, 8–11.

Behera, S. K., Deo, A. A. and Salvekar, P. S., Investigation of mixed layer response to Bay of Bengal cyclone using a simple ocean model. Meteorol. Atmosph. Phys., 1998, 65, 77–91.

Neetu, S. et al., Influence of upper-ocean stratification on tropical cyclone-induced surface cooling in the Bay of Bengal. J. Geophys. Res. Oceans, 2012, 117(C12), C12020.

Sengupta, D., Goddalehundi, B. R. and Anitha, D. S., Cycloneinduced mixing does not cool SST in the post-monsoon north Bay of Bengal. Atmosph. Sci. Lett., 2008, 9, 1–6.

Girishkumar, M. S. et al., Observed oceanic response to tropical cyclone Jal from a moored buoy in the south-western Bay of Bengal. Ocean Dyn., 2014, 64, 325–335.

Joseph, K. J., Balchand, A. N., Hareeshkumar, P. V. and Rajesh, G., Inertial oscillation forced by the September 1997 cyclone in the Bay of Bengal. Curr. Sci., 2007, 92, 790–794.

Vissa, N. K., Satyanarayana, A. N. V. and Kumar, B. P., Response of upper ocean and impact of barrier layer on Sidr cyclone induced sea surface cooling. Ocean Sci. J., 2013, 48, 279–288.

Navaneeth, K. N., Martin, M. V., Joseph, K. J. and Venkatesan, R., Contrasting the upper ocean response to two intense cyclones in the Bay of Bengal. Deep Sea Res. Part Oceanogr. Res. Pap., 2019, 147, 65–78.

Mathew, S., Natesan, U., Latha, G., Venkatesan, R., Rao, R. and Ravichandran, M., Observed warming of sea surface temperature in response to tropical cyclone Thane in the Bay of Bengal. Curr. Sci., 2018, 114, 1407–1413.

Mandal, S., Sil, S., Shee, A. and Venkatesan, R., Upper ocean and subsurface variability in the Bay of Bengal during cyclone Roanu: a synergistic view using in situ and satellite observations. Pure Appl. Geophys., 2018, 175, 4605–4624.

Kotal, S. D., Bhattacharya, S. K., Bhowmik, S. K. R. and Kundu, P. K., Growth of cyclone Viyaru and Phailin – a comparative study. J. Earth Syst. Sci., 2014, 123, 1619–1635.

A preliminary report on cyclonic storm, Viyaru over Bay of Bengal (10–16 May 2013), IMD, 2013.

Leipper, D. F. and Volgenau, D., Hurricane heat potential of the Gulf of Mexico. J. Phys. Oceanogr., 1972, 2, 218–224.

Kara, A. B., Rochford, P. A. and Hurlburt, H. E., An optimal definition for ocean mixed layer depth. J. Geophys. Res. Oceans, 2000, 105, 16803–16821.

Bonjean, F. and Lagerloef, G. S. E., Diagnostic model and analysis of the surface currents in the tropical Pacific Ocean. J. Phys. Oceanogr., 2002, 32, 2938–2954.

Price, J. F., Upper ocean response to a hurricane. J. Phys. Oceanogr., 1981, 11, 153–175.

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