Methodology for Estimating Tsunami Disaster Damage Using Geo-Spatial Information

摘要

This paper summarizes a method for estimating the degree and geographic extent of tsunami disaster damage from Indian Ocean Tsunami by using geo-spatial data (such as satellite remote sensing images, aerial photographs, topographic map, ground photos and field survey results) in two case studies of damage to west coast of southern Thailand. The authors learned the following from these case studies: 1) the extent of flooding can be estimated from discoloration of vegetation; 2) damage to buildings can be estimated by deciphering whether the roof was lost or not; and 3) damage to coastal facilities such as seawall can be also estimated by deciphering from geo-spatial information. Moreover, the authors developed a methodology to estimate the risk of a seawall being washed away by using a laboratory experiment and also developed a methodology to show how tsunami damage can be evaluated.