TITLE:
Integration of Spatial Analysis for Tsunami Inundation and Impact Assessment
AUTHORS:
Abu Bakar Sambah, Fusanori Miura
KEYWORDS:
Spatial Analysis; GIS; AHP; Tsunami
JOURNAL NAME:
Journal of Geographic Information System,
Vol.6 No.1,
February
13,
2014
ABSTRACT: Disaster mitigation
and reconstruction plan due to tsunami can be implemented with various actions. An integration of spatial analysis through Geographical Information System (GIS) application and multi-criteria analysis through Analytical Hierarchy Process (AHP) is one of the
methods for tsunami inundation and impact assessment. In this study, vulnerability, inundation and impact assessment due to tsunami hazard
in Ofunato city, Iwate Prefecture, Japan was carried out. Appropriate input parameters
were derived from Digital Elevation Model data, and satellite remote sensing and field data were
analyzed through GIS. We applied the parameter
of elevation and slope created from Aster GDEM version
2, coastline distance created from vector map of the study area and vegetation
density created from ALOS ANVIR-2 image. We applied AHP process for weighting the
parameter through pair-wise comparison using five iterations of normalized matrix.
Five classes of vulnerability were defined and analyzed for tsunami inundation mapping.
We used weighted overlay through spatial analyst in GIS to create the final map
of tsunami vulnerability. The assessment results indicate that 7.39 square kilometer
of the study area was under the high vulnerability zone due to tsunami, and 8.13
square kilometer of building area was under the inundation area. Our result showed good agreement with the observed data and historical map. The result presented here can aid as preliminary information
for the coastal zone management related to disaster mitigation and for the evacuation process and management
strategy during disaster.