研究実績の概要 |
The purpose of this study was to spatially evaluate the potential for tsunami vertical evacuation in the western coastal belt in Sri Lanka. Several criteria and assumptions have been computed to achieve the goal of the study. A geographic information system (GIS), remote sensing (RS), and demographic data facilitated the completion of the following tasks: (i) preparation of three tsunami scenarios based on the 2004 tsunami experience; (ii) updating the building layer and calculating the building height and volume by using airborne light detection and ranging (LiDAR) data; (iii) calculating the inundation ratio building volume loss, available building volume, and nighttime population; (vi) identifying the tsunami vertical evacuation sites based on the existing urban spatial structure; (vii) estimating the maximum capacity of the selected vertical evacuation sites using a usable building volume index (UBVI) and volume determination factor (VDF); and (vii) calculating tsunami arrival time, distance and time from resident place to evacuation centers in three tsunami scenarios. This study contributes to the use of existing urban structures to identify vertical evacuation sites based on three tsunami scenarios. The capacity estimation was done based on the newly proposed two indexes (UBVI and VDF), and this methodology can be used as a reference methodology in future tsunami vertical evacuation studies for different locations, especially lowland coastal cities to produce similar results.
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