Summary of Abstract Submission

Abstract Submission No. IO50-04-0027PresentationPoster

'S' SHAPED THROUGH-FLOW ACROSS THE GULF OF MANNAR AND THE PALK BAY

K. Sudheesh*1, M.T. Babu1, V. Sanilkumar1, P. Vethamony1

1 National Institute of Oceanography, India

ABSTRACT :

The Gulf of Mannar (GoM) and the Palk Bay (PB) are two semi-enclosed water bodies located between the southern part of east coast of India and northern part of west coast of Sri Lanka. GoM is a deep water gulf, whereas, PB is shallow water body, and both are separated by Adam's Bridge. The circulation in this region has been studied both by measurements and model (MIKE21 FM) to understand the annual flow pattern and water exchange between the two water bodies. The model sea surface elevations and currents were validated with measured water levels and currents, respectively. Model results indicated a distinct circulation pattern in PB and GoM, associated with seasonally oscillating NE and SW monsoon and inter-monsoon currents. The results further showed the presence of a distinct 'S'-shaped current (hitherto unknown), meandering across the Adam's Bridge from GoM to PB during SW monsoon and vice versa during NE monsoon. In GoM, the current during southwest monsoon is northward along the Indian coast, eastward along the Adam's Bridge and after crossing the Adam's Bridge, it meanders northwestward and flows past Delft islands and Kachchatheevu off Jaffna, Sri Lanka. The paper also presents full description of the circulation pattern in the GoM and PB for the above seasons, which is not studied so far to our knowledge.