Abstract
The spectral wave characteristics in the nearshore waters of northwestern Bay of Bengal are presented based on the buoy-measured data from February 2013 to December 2015 off Gopalpur at 15-m water depth. The mean seasonal significant wave height and mean wave period indicate that the occurrence of higher wave heights and wave periods is during the southwest monsoon period (June–September). 74% of the sea surface height variance in a year is a result of waves from 138 to 228° and 16% are from 48 to 138°. Strong inter-annual variability is observed in the monthly average wave parameters due to the occurrence of tropical cyclones. Due to the influence of the tropical cyclone Phailin, maximum significant wave height of 6.7 m is observed on 12 October 2013 and that due to tropical cyclone Hudhud whose track is 250 southwest of the study location is 5.84 m on 12 October 2014. Analysis revealed that a single tropical cyclone influenced the annual maximum significant wave height and not the annual average value which is almost same (~ 1 m) in 2014 and 2015. The waves in the northwestern Bay of Bengal are influenced by the southwest and northeast monsoons, southern ocean swells and cyclones.
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Acknowledgements
The authors gratefully acknowledge the financial support given by the Council of Scientific and Industrial Research, New Delhi and the Earth System Science Organization, Ministry of Earth Sciences, Government of India to conduct this research work. We thank Dr. T. M. Balakrishnan Nair, Mr. Arun Nherakkol, Scientist, INCOIS and NIO colleague Mr. Jai Singh for the help during data collection. Chilka Development Authority, Bhubaneswar provided the logistics during data collection period. The NCEP/NCAR wind data are provided by the NOAA-CIRES Climate Diagnostics Center, Boulder, Colorado at http://www.cdc.noaa.gov/. We thank both the reviewers for their critical comments and the suggestions. This article is CSIR-NIO contribution No. 6187 and forms part of the Ph.D. Thesis of the first author.
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Anjali Nair, M., Sanil Kumar, V. & Amrutha, M.M. Spectral Wave Characteristics in the Nearshore Waters of Northwestern Bay of Bengal. Pure Appl. Geophys. 175, 3111–3136 (2018). https://doi.org/10.1007/s00024-018-1838-5
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DOI: https://doi.org/10.1007/s00024-018-1838-5