Ĭhoi K H, Kim J S and Lee J C 2016 Migration of coastal erosional hotspots due to coastal protection structures J. Ĭhrysanti A, Adityawan M B, Widyaningtyas, Yakti B P, Nugroho J, Zain K, Haryanto I, Sulaiman M, Kurniawan A and Tanaka H 2019 Prediction of shoreline change using a numerical model: Case of the Kulon Progo Coast, Central Java MATEC Web of Conferences 270. īorgudd J 2014 Reducing risk for erosion in Maldives–Comparative case study of local people’s and resort’s adaptive capacity in Laamu atoll Thesis, Lund University. Revetment and submerged geo-tube breakwater are to be the most effective and feasible foreshore protection structure.īanton J, Warner P, Smith D and Morin V 2015 Selection of appropriate coastal protection strategies for Caribbean Coastlines In: Coastal Structures and Solutions to Coastal Disasters, pp. Highest erosion rate of − 4.23 m/yr was estimated in the eastern side of the island and on the southwest side of the chicken neck area (− 2.94 m/yr).Īssessment for shoreline change predictions was carried out using Gencade model during 2018–2028. Net erosion rate is − 1.2 m/yr and it shows − 1.36 m/yr in the lagoon side and − 2.35 m/yr in the eastern side.Įrosion hotspots are identified along the east and west coast. With this intervention, the existing shoreline of the island would at least be maintained, possibly preventing any further loss of land. Based on the prevailing conditions, suitable site-specific coastal protection structures (e.g., groynes, revetment, breakwater, submerged geo-tubes structures and submerged breakwater) were assessed to determine the most feasible and suitable shore protection measure and observed the following: (a) Revetment and submerged geo-tube structure to be the most effective protection measures on the eastern part of the Kavaratti Island, (b) significant decrease in current speed from 0.48 to 0.05 m/s, and (c) significant decrease in wave height (from 2.5 to 0.3 m) and wave energy reduction about 50% from the prevailing conditions were observed. Subsequently, model simulations were conducted for the most appropriate use of structural protection measure to understand the change in hydrodynamics and sediment transport, which would ultimately result in stabilization of the Kavaratti Island coast. For this purpose, shoreline change around the island was obtained from field surveys and results of the DSAS model. Numerical models were used to identify suitable foreshore protection structures, considering the near-shore coastal processes. The scouring, in front and behind the breakwater structure under prevailing wave conditions, is estimated for designing scour protection.Erosion along Kavaratti Island has intensified in recent times due to infrastructure development and natural phenomenon. The geosynthetic tube material specifications such as tensile strength, ultra violet ray resistance, apparent opening size and fabric material are calculated using suitable design methods. The breakwater structure is checked for stability against sliding, overturning and bearing capacity. Design and stability checks are carried out by using available literature as no standard methods or design codes are available for design or stability checks for the geosynthetic tubes. Geosynthetic tubes shall be placed in a stacked manner with 2 tubes of 1.5 m high each at the bottom and a tube of 2.5 m height at the top accounting for height loss due to settlement. The submerged breakwater is proposed to be constructed at 4 m water depth up to a height of 3.5 m using sand filled geosynthetic tubes. Based on numerical model studies and assessment of shoreline behaviour over two years, it is proposed to construct a submerged segmented breakwater. Since most of the erosion occurred after the storm waves hit the shoreline, sustainable option for shoreline protection would be to shift wave breaking to deeper depths. The Tamil Nadu Fisheries department facilities located near the coast is subjected to damage as the coastline has receded by 45 m in the last few years following the severe erosion caused by cyclones. The coastline of KPK was subjected to severe erosion due to high energy waves during Thane (2011), Nilam (2012) and Madi (2013) cyclones. Kadalur Periyakuppam (KPK) is a fishing village located 70 km south of Chennai in Tamil Nadu.
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