Summary of Abstract Submission

Abstract Submission No. IO50-04-0037PresentationPoster


Sourav Sil*1, T. Murty2, D. Swain1

1 School of Earth, Ocean and Climate Sciences, IIT Bhubaneswar, India
2 Civil Engineering, University of Ottawa, Canada


The tidal harmonics has been analyzed in the Bay of Bengal from tide observation and tidal model (Murty and Henry, 1983; Sindhu and Unnikrishnan, 2012). It has been identified that the semi-diurnal signals (M2, S2 and N2) are dominant in the northwestern Bay of Bengal. In recent time, the HF radar network in the Northern Indian Ocean allows studying the high frequency variability of the ocean current in the coastal region. Specifically, we focus on the HF radar data (from Puri and Gopalpur stations) that is available (courtesy, INCOIS) hourly on a 6-km grid (albeit with some spatial and temporal gaps) over a limited region (18-20N, 85-87E). Once the tidal components are available, the whole time-series of HF radar data will be reconstructed to fill in the gaps. This data set provides us with the opportunity of resolving higher-order shallow-water constituents near the well-known degenerate amphidromic (zero-amplitude) point situated at about 60 km offshore of Paradip. Preliminary analysis indicates that the diurnal tidal component (K1) is significant in addition to the well-known semidiurnal (M2) components in the northwestern Bay of Bengal, suggesting that the tidal regime is of a mixed type. The HF derived ocean current also enables to identify the shallow water components (M3, M4, 2MK5, M6) with significant amplitudes. The mechanism of the shallow water harmonics will be investigated because it would be very useful in the study of tide-surge interaction (Sinha et al., 2008). Furthermore, the higher order constituents would be important to resolve flow around complex islands.