Wednesday 22 July 2015

Coastal Vulnerability Assessment | Index and Sea Level Changes

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Coastal Vulnerability Assessment

  • Earth System Science Organization (ESSO) – Indian National Centre for Ocean Information Services (INCOIS), Hyderabad and ESSO-Integrated Coastal and Marine Area Management (ICMAM), Chennai have carried out mapping and demarcating of multi-hazard coastal vulnerability for the states.- in Aug 2014
  • On seven dynamic risk variables:
    • shoreline change rate, 
    • sea-level change rate, 
    • coastal slope, 
    • mean significant wave height, 
    • mean tidal range, 
    • coastal regional elevation and 
    • coastal geomorphology.
  • Results:
    • The general trend in the vulnerability, demarcated in to four classes (very high, high, medium and low)
    • The Gulfs of Kambhat and Kachchh in Gujarat show very high vulnerability indices, with the inlets of Kachchh showing localized vulnerability. 
    • Relatively low vulnerability along the zones of Mangroves that help in breaking the large amplitude waves, dissipating the energy and hence act as a natural barrier. 
Sea Level Changes:
    • Sea level rise is a very slow phenomenon and can be because of physical factors like 
      • normal subsidence, 
      • coastal erosion and 
      • siltation of river channels along the coastline apart from 
      • global warming. 
    • INDIA: the trends of sea level rise as estimated to be 1.3mm/year along the Indian coasts during the last 40-50 years. 
      • ESSO-INCOIS and the Survey of India continuously monitor the sea level measurements all along the Indian coastline. 
    • GLOBAL
      • 5th Assessment Report (AR5) of IPCC suggests that global mean sea level has risen by 0.19 m over the period 1901-2010. 
      • The Report also suggests that sea level rise takes place in the background of several other physical factors like 
        • tsunami’s, 
        • storm surges and 
        • tidal variations, 
        • swells, 
        • normal deltaic subsidence, 
        • coastal erosion and 
        • siltation of river channels along the coastline.
Read more about Coastal Vulnerability Index HERE

[Source: PIB]


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