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Submerged Geosynthetic Reef as Shore Protection Measure for Islands

Journal of Marine Science and Application 2022年第1期21卷 128-139页

作者： vallam sundar Sannasi Annamalaisamy Sannasiraj Sukanya Ramesh Babu Dipak Kumar Maiti Department of Ocean Engineering Indian Institute of Technology MadrasChennai 600036India West Bengal State Fisheries Development Corporation Limited Kolkata 700091India

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 *** 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 *** 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 *** 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 *** submerged reef can effectively be devised to redistribute the current circulation pattern and trap the sediment for beach *** 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 *** 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/*** to logistical constraints geosynthetic materials had to be *** detailed design of such a system arrived through numerical modelling and field measurements are presented and discussed in this paper.

关键词： Island coastal erosion Submerged reef Tide dominant currents Sediment movement Geosynthetic materials

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The Effects of Flexible Vegetation on Forces with a Keulegan- Carpenter Number in Relation to Structures Due to Long Waves

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Journal of Marine Science and Application 2012年第1期11卷 24-33页

作者： Noarayanan Lakshmanan (1) Murali Kantharaj (2) murali@iitm.ac.in vallam sundar (2) vsundar@iitm.ac.in Division of Environmental & Water Resources Engineering Nanyang Technological UniversitySingapore 63979Singapore Department of Ocean Engineering Indian Institute of Technology MadrasChennai 600036India

Extreme coastal events require careful prediction of wave forces. Recent tsunamis have resulted in extensive damage of coastal structures. Such scenarios are the result of the action of long waves on structures. In this paper, the efficiency of vegetation as a buffer system in attenuating the incident ocean waves was studied through a well controlled experimental program. The study focused on the measurement of forces resulting from cnoidal waves on a model building mounted over a slope in the presence and absence of vegetation. The vegetative parameters, along with the width of the green belt, its position from the reference line, the diameter of the individual stems as well as the spacing between them, and their rigidity are varied so as to obtain a holistic view of the wave-vegetation interaction problem. The effect of vegetation on variations of dimensional forces with a Keulegan-Carpenter number （KC） was discussed in this paper. It has been shown that when vegetal patches are present in front of structure, the forces could be limited to within F＊≤I, by a percentile of 92%, 90%, 55%, and 96%, respectively for gap ratios of 0.0, 0.5, 1.0, and 1.5. The force is at its maximum for the gap ratio of 1.0 and beyond which the forces start to diminish.

关键词： Coastal vegetation modeling vegetal stems vegetation-flow parameter vegetal parameter staggered vegetation Keulegan-Carpenter number

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