Journal Articles

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Author: search.filters.author.Jena, B. K.Has files: Yes

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    Surface current and wave measurement during cyclone Phailin by high frequency radars along the Indian coast
    (Current Science, 2015-02) John, Manu; Jena, B. K.; Sivakholundu, K. M.
    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.
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    Seasonal variation in nearshore wave characteristics offCuddalore, Southeast coast of Tamil Nadu, India
    (Current Science, 2017-05) Jena, B. K.; Patra, Sisir K.; Joseph, K. Jossica; Sivakholundu, K. M.
    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 (,sw and 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 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.