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Citation:
 Vallam Sundar,Sannasi Annamalaisamy Sannasiraj,Sukanya Ramesh Babu,et al.Submerged Geosynthetic Reef as Shore Protection Measure for Islands[J].Journal of Marine Science and Application,2022,(1):128-139.[doi:10.1007/s11804-022-00256-z]
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Submerged Geosynthetic Reef as Shore Protection Measure for Islands

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Title:
Submerged Geosynthetic Reef as Shore Protection Measure for Islands
Author(s):
Vallam Sundar1 Sannasi Annamalaisamy Sannasiraj1 Sukanya Ramesh Babu1 Dipak Kumar Maiti2
Affilations:
Author(s):
Vallam Sundar1 Sannasi Annamalaisamy Sannasiraj1 Sukanya Ramesh Babu1 Dipak Kumar Maiti2
1 Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai 600036, India;
2 West Bengal State Fisheries Development Corporation Limited, Kolkata 700091, India
Keywords:
Island coastal erosionSubmerged reefTide dominant currentsSediment movementGeosynthetic materials
分类号:
-
DOI:
10.1007/s11804-022-00256-z
Abstract:
The Sagar Island, located north of the Bay of Bengal, intercepts the flow in the Hoogly estuary that comprises a network of several estuarine distributaries and creeks, which is considered to be one of the largest estuarine systems in the world. The Hooghly River experiences a tidal range in the order of about 4 m, due to which the tide-generated currents drive the sediments which are continuously set in motion. The temple, Kapil Muni (21°38’15.35"N, 88°4’30.56"E) is located on the south-western side of Sagar Island, where an annual religious festival and rituals with about a million pilgrims is conducted. The pertinent erosion problem at a rate of about 5 m/year is prevalent at the site has considerably reduced the beach width, thereby, resulting in reduced space for religious as well as recreational activities along the coast. A novel cross-section for the proposed submerged reef using geosynthetic materials is designed considering the different sitespecific, environmental, and socio-economic conditions. The submerged reef can effectively be devised to redistribute the current circulation pattern and trap the sediment for beach restoration. The performance of such a structure depends on its geometrical and structural characteristics, the location of the reef (i. e.) the water depth at the toe, distance from the coastline, wave-structure interaction, sediment transport and local morpho dynamics. The aforesaid criteria were optimized using a numerical model which predicted the average residual velocity in the site to be in the order of about 1 m/s. Owing to logistical constraints geosynthetic materials had to be employed. The detailed design of such a system arrived through numerical modelling and field measurements are presented and discussed in this paper.

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Memo

Memo:
Received date: 2021-07-11;Accepted date: 2021-10-24。
Corresponding author:Vallam Sundar,E-mail:vsundar@iitm.ac.in
Last Update: 2022-04-22