Geomorphic Effect of Groyne Type Bunds and Their Impact on Varsoli Creek, Alibag, Maharashtra

Abstract: Coasts are very dynamic areas and they are constantly changing. This change is due to three main processes such as erosion, transportation and deposition which operate at the coast. A groyne is a method of coastal defense against erosion. Groynes are low walls built outwards from the coast into the sea, to prevent the continuous movement of waves and sediments from other parts of the area. Due to the construction of groyne the accumulation of sediment into creek was minimized and accumulation of sand on either side of the bunds resulted in extension of beaches. After the construction of groyne the boats of the fishermen could be easily transported to the bank of the creek. Fishing activity has since then flourished again and has helped the local fishermen to survive. The beach levels in post monsoon and pre monsoon months were compared to understand the overall cut and fill areas developed on the coast south and north of the groyne. The northern and southern sectors have suffered from seasonal cutting and filling in monsoon and fair weather, but the general tendency of beach extension is recorded since 2002 along north and south of the groynes. Fishing is the major primary activity in Varsoli village though some villagers are engaged in farming. Dried fish are sent to vary parts in Pune, Mumbai, Kolhapur and Kankavli. Before the construction of groyne fish production was 538 to 1162 tones. After the construction of groyne fish production has increased from 608 to 1847 tone.