Littoral processes along shoreline from Andhakaranazhi to Azhikode on the Kerala Coast

Abstract

Distribution of wave energy and variations in wave height and direction of longshore currents have been estimated from the wave refraction diagrams for predominant waves approaching the shore. A zone of strong energy concentration for waves of 14 sec period approaching from 240ᵒ has been identified near Azhikode, Kerala, India. The direction of littoral current is northerly for waves approaching from 220ᵒ and 240ᵒ whereas it is southerly for waves approaching from 280ᵒ and 300ᵒ. Probable areas of rip currents have been identified along the shore. More areas of generation of rip currents have been located during southwest monsoon season when wave approach is from 260ᵒ. Regions of possible erosion and accretion have been identified. The coastline shows an erosional tendency under the influence of waves approaching from 220ᵒ and 240ᵒ and an accretional tendency under the influence of waves from 280ᵒ and 300ᵒ.