Preprints
https://doi.org/10.5194/nhess-2023-191
https://doi.org/10.5194/nhess-2023-191
16 Jan 2024
 | 16 Jan 2024
Status: this preprint is currently under review for the journal NHESS.

Shoreline and Land Use Land Cover Changes along the 2004 tsunami-affected South Andaman Coast: Understanding Changing Hazard Susceptibility

Vikas Ghadamode, K. Kumari Aruna, Anand K. Pandey, and Kirti Srivastava

Abstract. The 2004-tsunami affected the South Andaman coast experiencing dynamic changes in the coastal geomorphology making the region vulnerable. We focus on pre-and post-tsunami shoreline and Land Use Land Cover changes for the period 2004, 2005, and 2022 to analyse the dynamic change in hazard. We used GEBCO bathymetry data to calculate Run-up (m), arrival times (Min), and inundation (m) at 13 different locations using the 2004 Sumatra Earthquake source parameters. The Digital Shoreline Analysis System is used for the shoreline change estimates. The Landsat data is used to calculate shoreline and LULC change in five classes, namely Built-Up Areas, Forests, Inundation areas, Croplands, and water bodies during the above period. We examine the correlation between the LULC changes and the dynamic change in shoreline due to population flux, infrastructural growth, and Gross State Domestic Product growth. India industry estimates the Andaman & Nicobar Islands losses exceed INR 10 billion during 2004 that would see a five-fold increase in economic loss due to a doubling of built-up area, a three-fold increase in tourist inflow, and a population density growth. The unsustainable decline in the forest cover, mangroves and cropland would affect sustainability during a disaster despite coastal safety measures.

Vikas Ghadamode, K. Kumari Aruna, Anand K. Pandey, and Kirti Srivastava

Status: open (until 12 Mar 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2023-191', Anonymous Referee #1, 30 Jan 2024 reply
    • AC1: 'Reply on RC1', Anand Kumar Pandey, 23 Feb 2024 reply
Vikas Ghadamode, K. Kumari Aruna, Anand K. Pandey, and Kirti Srivastava
Vikas Ghadamode, K. Kumari Aruna, Anand K. Pandey, and Kirti Srivastava

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Short summary
In the 2004-Tsunami affected southern Andaman region tsunami wave propagation, arrival times, and run-up heights at 13 locations are computed to analyse pre- and post-tsunami shoreline and LULC changes to understand the evolving hazard scenario. The LULC changes and dynamic shoreline changes are observed in Zones 3, 4, and 5 owing to dynamic population changes, infrastructural growth, and Gross State Domestic Product growth. Economic losses would increase five-fold foa a similar tsunami.
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