Summary of Abstract Submission

Abstract Submission No. IO50-03-0052PresentationPoster


Aditi Mitra*1, Jubin Thomas1, Naidu V S1

1 CSIR-National Institute of Oceanography, India


Gulf of Khambhat is an inverted funnel shaped area on the western continental shelf of India, between the Saurashtra peninsula and the mainland of Gujarat. To study the hydrodynamics as well as the largely loaded suspended sediment (SS) transport, a 2D hydrodynamic model has been used in the area extending from the headland of the gulf in the north to the fifty fathom flat in the south. During the study, average SS concentration in this area is 1760mg/l for premonsoon and 1085mg/l for postmonsoonal months. Tide and current calibration has been done with the help of four tidal observations and two observed currents in this area with varying bottom friction coefficients and it was found that both these observations are in good agreement with modelled data. Lagrangian particle tracking study has been calibrated with the drogue study conducted near Dahej and Bhavnagar inside the Gulf. Comparison of observed circulation path (33 km) collected during ebb to flood on 25th April 2013 with modelled track (33.2 km) indicates that deviation in the track is 200 m. The observed trajectory (15.6 km) of 17th April 2013 which represents flood to ebb is also compared with the modelled trajectory (15.9 km). Both the results show good agreement between the observed and predicted trajectories. Particles have been released at different locations in and outside the gulf region to study the circulation path. It has been found that there is a trend of the particles to move within the gulf whenever it has been released inside. The particles released at off Veraval and off Mumbai locations have a tendency to move towards the coastline. This special feature of circulation pattern of the gulf perhaps participates in the formation of the fifty fathom flat in the off Mumbai region.