Longshore currents and associated sediment transport in the nearshore areas of Kerala and Goa, west coast of India

C.S. Murty, M. Veerayya

Abstract



The field observations on the longshore currents at selected locations along the coasts of Goa and Kerala on the western seaboard spanning over a period of five years revealed high variability in their direction and speed. The currents and the associated circulation of water derived from wave refraction diagrams for these regions indicated the near closed cellular patterns of flows for waves of near normal incidence while meandering flows either in an upcoast or downcoast direction have been found to result in for waves approaching the shore from extreme deep-water directions. The sediments of this zone brought into suspension through turbulence generated by wave breaking processes have been found to get recirculated in the area under the influence of these circulations. Under some favourable environments these currents and the associated circulation of water help in maintaining the shoals in the vicinity of river mouths or in stabilising the shores

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