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Physical Modelling for the Restoration of Damaged Breakwater—A Case Study at Kalpeni Island, Lakshadweep
Kalpeni is one the islands in the Lakshadweep archipelago. A 165 m long breakwater was constructed at Kalpeni Island to achieve the berthing conditions at the wharf used for the passenger as well as fishing vessels for all seasons. During the ‘Ockhi’ cyclone in Dec 2017, the wave height was about 7–7.5 m which severely damaged the breakwater leaving behind only the berthing wharf. The restoration of breakwater was completed in two phases. Initially, a temporary restoration work was carried out by replenishing scattered debris/boulders. Finally, the desk and wave flume studies were carried out to design a permanent restoration work for the damaged breakwater. The design to restore this damaged breakwater required tetrapods weighing 25–30 tonnes in the armour layer and bottom width exceeding 60 m. Moreover, it is difficult to cast and handle the tetrapods of this larger size due to limited space and with available heavy machinery and cranes. Based on the site conditions and hindcasting studies, the breakwater was designed against the wave action for a return period of 25–30 years. The wave flume studies were carried out to check the hydraulic stability of the breakwater under regular and random wave action. The wave flume studies indicated that the crest of the breakwater is sensitive to the overtopping waves. Various tests were carried out using different sizes of concrete cubes (CC) blocks and parapet wall placed at the crest to check its hydraulic stability. After various modifications, a hydraulically stable block against significant wave height was selected. This study provides an insight into the possible challenges that can be encountered while restoring a damaged breakwater.
Physical Modelling for the Restoration of Damaged Breakwater—A Case Study at Kalpeni Island, Lakshadweep
Kalpeni is one the islands in the Lakshadweep archipelago. A 165 m long breakwater was constructed at Kalpeni Island to achieve the berthing conditions at the wharf used for the passenger as well as fishing vessels for all seasons. During the ‘Ockhi’ cyclone in Dec 2017, the wave height was about 7–7.5 m which severely damaged the breakwater leaving behind only the berthing wharf. The restoration of breakwater was completed in two phases. Initially, a temporary restoration work was carried out by replenishing scattered debris/boulders. Finally, the desk and wave flume studies were carried out to design a permanent restoration work for the damaged breakwater. The design to restore this damaged breakwater required tetrapods weighing 25–30 tonnes in the armour layer and bottom width exceeding 60 m. Moreover, it is difficult to cast and handle the tetrapods of this larger size due to limited space and with available heavy machinery and cranes. Based on the site conditions and hindcasting studies, the breakwater was designed against the wave action for a return period of 25–30 years. The wave flume studies were carried out to check the hydraulic stability of the breakwater under regular and random wave action. The wave flume studies indicated that the crest of the breakwater is sensitive to the overtopping waves. Various tests were carried out using different sizes of concrete cubes (CC) blocks and parapet wall placed at the crest to check its hydraulic stability. After various modifications, a hydraulically stable block against significant wave height was selected. This study provides an insight into the possible challenges that can be encountered while restoring a damaged breakwater.
Physical Modelling for the Restoration of Damaged Breakwater—A Case Study at Kalpeni Island, Lakshadweep
Lecture Notes in Civil Engineering
Pandey, Manish (editor) / Umamahesh, N. V. (editor) / Oliveto, Giuseppe (editor) / Ramana, G. V. (editor) / Tayade, B. R. (author) / Praveen, K. M. (author) / Sharma, Deepak (author) / Jagtap, S. P. (author)
International Conference on Hydraulics, Water Resources and Coastal Engineering ; 2023 ; Warangal, India
2025-03-02
11 pages
Article/Chapter (Book)
Electronic Resource
English
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