Tidal modelling in the west coast of India

Laurent Testut (LEGOS/LIENSs, France)


A.S. Unnikrishnan (NIO, India)

Event: 2014 Ocean Surface Topography Science Team Meeting

Session: Tides, internal tides and high-frequency processes

Presentation type: Type Poster

Global tidal solutions are sometimes inaccurate in coastal regions. This is particularly true in some regions of the northern Indian Ocean, which are characterized by wide continental shelves and large tidal ranges. We show that these global solutions are inaccurate on the shelf region off Mumbai, off the west coast of India. In this region, the shelf is very wide and it opens into the Gulf of Khambhat, where large tides are observed. Moreover, it is noticed that in regions of large semi-diurnal tides in the Bay of Bengal, such as, the head Bay, Gulf of Martaban etc., global tidal solutions are not accurate. In the present work, we focus on the shelf region off the west coast of India. We used a new approach in developing a high resolution hydrodynamic tidal model for the inner shelf region (8°N to 22°N). The open boundary of the model is aligned to the altimetric tracks, which allowed to prescribe boundary conditions obtained directly from observations. It is shown that the tidal solutions at the coast are much improved compared to those obtained from the global solutions and that in the wide shelf portion and the Gulf of Khambhat the improvement has been significative.
Laurent Testut