| dc.description.abstract | Floods, a recurring phenomenon
primarily in low-lying basin areas can be
interpreted as beneficial for improving soil
structure and cropland products, but they can
also be viewed as one of the most catastrophic
natural disasters adversely affecting human life
and the environment. The main reason for the
Baddegama area's flooding is the Ging River
flowing through it. The purpose of this research
is to prevent the damage caused due to the lack
of proper understanding of the flood risk in
built-up areas. To identify the riskiness of the
built-up area, it should overlay the flood
inundation map and built-up area map. To
create a flood map, five criteria were selected
according to the ideas of well-knowledgeable
people who lived in the Baddegama area. In
order to Land Use Land cover (LULC), slope,
rainfall, soil, and water features were identified
as the criteria that were affected by the flood in
the area. An Analytical Hierarchy Process was
used to scale the criteria, and the weighted
overlay method was used to create the flood
map. LULC map, as well as a built-up map, were
created using a Landsat 8 image and a method
of supervised classification. The built-up area
map was created after performing the
Normalized Difference Built-up Index (NDBI).
Most built-up areas in the Baddegama are under
moderate flood risk. Further, 14% of built-up
areas are at high risk. The riskiness levels of the
built-up area as a final output of this study could
be used when establishing evacuation centers.
Keywords: AHP, Normalized Difference Built up Index (NDBI), Supervised Classification,
Weighted Overlay | en_US |
