Temporal and spatial variation in the sediment volume along the beaches between Ovari and Kanyakumari (SE INDIA)

A 2-year set of profile data from Ovari to Kanyakumari Beach, SE India has been analysed by using empirical orthogonal function (EOF) techniques to identify characteristic patterns of temporal and spatial variation in the sediment volume of the beaches. The results show that variation in the sediment volume of the beach is determined by interaction between the biennial and seasonal exchanges. EOF analysis the pattern of alongshore sediment exchange along the study area. The method facilitated separation of onshore-offshore and alongshore modes of sediment transfer and identification of the patterns of alongshore sediment exchange. The eigenfunction modes confirm the dominance of biennial, annual, and biannual sediment transfers occurring on study area. The sediment movement along the shoreline of study area is mainly governed by the forces associated with the incoming waves and the availability of sediments within the area. The present investigation has been made as an attempt to appreciate the sediment movement in relation to wave activity along the coast. The longshore sediment transport is intensive in the northerly direction as compared to southerly direction. The normal condition is for and to be moved annually or more frequently in the shallows and on the beach. Waves and wave-driven currents cause longshore drift of sand along the beach and offshore.