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  1. Home
  2. Indian Institute of Technology Madras
  3. Publication7
  4. Storm surge vulnerability along Chennai-Cuddalore coast due to a severe cyclone THANE
 
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Storm surge vulnerability along Chennai-Cuddalore coast due to a severe cyclone THANE

Date Issued
01-09-2013
Author(s)
Rao, V. Ranga
Subramanian, B. R.
Mohan, R.
Kannan, R.
Mageswaran, T.
Arumugam, T.
Rajan, B.
DOI
10.1007/s11069-013-0630-1
Abstract
A very severe cyclonic storm 'Thane' developed over the Bay of Bengal during 25-30 December 2011, crossed the Tamilnadu coast between Pondicherry and Cuddalore (southeast coast of India) in early hours of 30 December with a wind speed 120-140 km/h. The offshore tide record reveals that the surge started to generate around 1100 hours on 29 December 2011 with a height 0.4 m and later raised to 0.68 m at the time of land fall, that is, early hours (0000 hours) of 30 December 2011. Field reconnaissance survey on surge run-up and inundation distance at 15 selected locations of cyclone affected areas reveals that the vulnerability levels are highly variable along the coast. The inundation distance extended up to 30-230 m landward from the shoreline and run-up reached to 1.6-3.2 m above chart datum depending upon the cross-shore geometry of the location. In the areas (Verranampattinam, Chinamudaliyar kuppam and Silver beach) near cyclone landfall, the run-up was up to 2.5-3.2 m and the inundation distance extended up to a maximum of 230 m. However, in the areas located about 150 km north of cyclone landfall, the run-up limited from 1.6 to 1.7 m and the inundation distance extended up to only a maximum of 169 m. The inundation distance is mainly influenced by the slope of the beach. In the areas having beach slope between 1 in 135 and 1 in 220, the inundation distance was 210-230 m. However, in the areas having beach slope 1 in 17 to 1 in 34, the inundation distance is restricted between 35 and 50 m. © 2013 Springer Science+Business Media Dordrecht.
Volume
68
Subjects
  • Beach slope

  • East coast of India

  • Run-up

  • Surge levels

  • Tropical cyclone

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