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Determining Evacuation Service Areas and Evacuation Route Risk Level as Disaster Mitigation Plan using GIS >
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|Title: ||Determining Evacuation Service Areas and Evacuation Route Risk Level as Disaster Mitigation Plan using GIS|
|Authors: ||Indradi WIJATMIKO, Keisuke MURAKAMI|
|Issue Date: ||27-Oct-2009 |
|Abstract: ||In recent years, studies on tsunami mitigation and the tsunami emergency management have been frequently conducted. Further, many of tsunami mitigation methods have been introduced to minimize assets damages, injuries or fatalities. In case of Tsunami, the main point is to evacuate victims from inundated areas to the evacuation places or secure areas as soon as possible. However during tsunami attack, refuges are often rushing to their shelters without considering safety of evacuation routes, thus inappropriate decision of evacuation route may lead to the injuries or fatalities. Therefore the aim of this study is to provide spatial information on evacuation route with its risk level by using geographic information system (GIS).
Through GIS, evacuation service areas, recommended evacuation routes, and road risk level can be determined. In this study, evacuation service area refer to zones surrounding selected evacuation places that achievable by walking people with average speed in short amount of time. While the road risk level gives information on the safety condition in each routes, which is scaled 1-10 (1 refers to the safest route). Hyuga city in Miyazaki province in Japan is taken into study area. Moreover, this area will be divided into 5 subzones in order to carry out more accurate investigation.
Network analysis in Arc GIS 9.2 was used to generate service areas based on tsunami’s travel time and human’s walking speed. Subsequently, inside the evacuation service areas, risk level were calculated by analyzing soil conditions, road width, slope elevation and inundated areas. The output indicated that risk level in Hyuga city are between 2-8, and blocking some roads due to the dangerous areas effected on evacuation service area deduction.|
|Appears in Collections:||Determining Evacuation Service Areas and Evacuation Route Risk Level as Disaster Mitigation Plan using GIS|
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