Research Publications

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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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    Short term morphological evolution of sandy beach and possible mitigation: A case study off Kadalur Periyakuppam
    (Indian Journal of Geo-Marine Sciences, 2014-07) Sivakholundu, K. M.; Vijaya, R.; Kiran, A. S.; Abhishek, T.
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    The intrusion of spicy water favours the intensification of Arabian Sea cyclones
    (Taylor & Francis, 2023-03-15) Maneesha, K.; Brahmananda Rao, V.; Patnaik, K. V. K. R. K.; Franchito, S. H.
    The intensity of the cyclones in the Arabian Sea has been increasing in recent years. Approximately ten storms were intensified into severe cyclones over spicy waters of the northern Arabian Sea during 1998-2019. Reduction in upwelling was observed due to decreasing wind speed, which raised the sea surface temperature (SST) and the intrusion of spicy waters from the Red Sea and the Persian Gulf acted as a barrier to mixing in the top layers, especially in May. Consequently, there was a noticeable increase in the heat content of the 50 m surface layer. This research presents two main rationales that explain the intensification of these cyclones. The first rationale explores the increasing trends in SST and ocean internal energy, while the second investigates the influence of the intrusion of spicy Persian Gulf waters into the Oman coast. The results showed that spicy water from the north suppressed the upwelling in the cold core eddy off the Oman coast and that higher SSTs and high latent heat flux almost double the climatological values off the Oman coast in May.