Longshore‐Transport Model for South Indian and Sri Lankan Coasts

Longshore‐sediment transport rates for the south Indian coast from Allur to Cochin and for Sri Lanka are estimated from ship‐reported wave data (1968–86). Annual gross sediment transport rate is high (1.5 to 2.0×106m3) along the coasts of north Tamil Nadu and south Kerala and is less (0.5 to 1.0×106m3) along the south Tamil Nadu and Sri Lankan coasts. The annual net transport is southerly along the west coast of India and predominantly northerly along the east coast except near Durgarajupatnam in Andhra Pradesh. Coasts near Tharangampadi, Karaikal, Nagore, Tuticorin, Virapandianpatinam, and Manakkodam in India and Kuchchaveli, Betticola, Pottuvil, Chilaw, and Negombo in Sri Lanka appear to be nodal drift points, with an equal volume of transport in either direction annually.