An advanced GIS
based approach for the assessment of coastal inundation in the storm surge region
(Krishna District) of Andhra Pradesh, INDIA
Malik Arshid Hussain and Uma Devi Randhi
Disaster Advances; Vol. 17(5); 34-49;
doi: https://doi.org/10.25303/175da034049; (2024)
Abstract
Climate change leads coastal areas to suffer from rising sea levels, flooding, storm
surges and cyclones which can cause irreparable harm to people and their assets.
The mapping of these alterations to the coastline can assist in sustainable coastal
development and surveillance. The current research emphasized the susceptibility
of coastal inundation in the Krishna District of Andhra Pradesh, which is the State’s
most vulnerable place to flooding and cyclonic storms. The Indian Meteorological
Department website (mausam.imd.gov.in) was accessed to get latitudinal and longitudinal
data on cyclonic storms that hit the area recently. The satellite imagery was acquired
from Google Earth and USGS (earthexplorer.usgs.gov) to map the coastal settlements
within 25 km radius of the coastline and to generate Digital Elevation Model (DEM)
to identify the coastal inundation vulnerability up to 5.0 M contour elevation (2m,
3m, 4m and 5m).
According to findings, there was a small impact of coastal inundation up to 4 meter
sea level rise, so the research primarily concentrated on the assessment of coastal
inundation with 5 meter sea level rise. A total of 512 settlements studied for coastal
inundation encompassed an area of about 11405.4 hectares. The DEM identified that
a large number of settlements in the Krishna District are on the verge of coastal
inundation. About 125 settlements (24.5% settlements) with an area of approximately
2099.5 hectares are most vulnerable to coastal submergence, accounting for 18.5%
of the studied area. This damage exposure assessment helps local government and
policymakers to counteract extreme inundation events.
