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Abstract <p>Observations, modelling, and reports show that the west coast of India bordering the Arabian Sea is prone to long-period swells generated in the Southern Indian Ocean. Although these swells also propagate into the Bay of Bengal, they are not predominant in the southeast coastal parts of India. Analyses of data from wave rider buoy observations which are deployed off the coast of Kollam (located on the southwest coast of India) and Pondicherry (located on the southeast coast of India) for the year 2019 suggest that 96% of the events of long-period swells which are seen in the Kollam buoy data are not reaching Pondicherry. Using the WAVEWATCH III 6.07 model, focused experiments are carried out to show that the Sri Lankan Land Mass (SLLM), situated in the south east part of the Indian peninsula, effectively blocks the long-period swell waves from the Southern Ocean from reaching the south-east coast of India. Our analysis shows that in the absence of SLLM, the destructive Southern Ocean swells can reach the Indian southeast coast, including the areas north of Sri Lanka until mid-Andhra Pradesh.</p> Research highlights <p><UnorderedList Mark="Bullet"> <ItemContent> <p>The present study examines the role of Sri Lankan Land Mass (SLLM) in blocking the long-period Southern Ocean swells, thereby protecting the southeastern coasts of India from these devastating swell wave attacks.</p> </ItemContent> <ItemContent> <p>The study substantiates our hypothesis that SLLM effectively blocks the Southern Ocean swells from reaching the south-eastern coasts of India.</p> </ItemContent> <ItemContent> <p>This study assumes significance in emerging global climate change and associated sea level rise scenario, in which it is projected that several low-lying areas and islands will be permanently submerged.</p> </ItemContent> </UnorderedList></p>

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On the role of Sri Lankan land mass in safeguarding the southeastern coast of India from Southern Ocean swell attacks

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • K G Sandhya,
  • R Harikumar,
  • P A Francis,
  • Balaji Baduru,
  • T M Balakrishnan Nair

摘要

Abstract

Observations, modelling, and reports show that the west coast of India bordering the Arabian Sea is prone to long-period swells generated in the Southern Indian Ocean. Although these swells also propagate into the Bay of Bengal, they are not predominant in the southeast coastal parts of India. Analyses of data from wave rider buoy observations which are deployed off the coast of Kollam (located on the southwest coast of India) and Pondicherry (located on the southeast coast of India) for the year 2019 suggest that 96% of the events of long-period swells which are seen in the Kollam buoy data are not reaching Pondicherry. Using the WAVEWATCH III 6.07 model, focused experiments are carried out to show that the Sri Lankan Land Mass (SLLM), situated in the south east part of the Indian peninsula, effectively blocks the long-period swell waves from the Southern Ocean from reaching the south-east coast of India. Our analysis shows that in the absence of SLLM, the destructive Southern Ocean swells can reach the Indian southeast coast, including the areas north of Sri Lanka until mid-Andhra Pradesh.

Research highlights

The present study examines the role of Sri Lankan Land Mass (SLLM) in blocking the long-period Southern Ocean swells, thereby protecting the southeastern coasts of India from these devastating swell wave attacks.

The study substantiates our hypothesis that SLLM effectively blocks the Southern Ocean swells from reaching the south-eastern coasts of India.

This study assumes significance in emerging global climate change and associated sea level rise scenario, in which it is projected that several low-lying areas and islands will be permanently submerged.