Construction of heterogeneous road network and understanding and evaluation of evacuation routes focusing on villages.

Abstract

 In Japan, maintaining infrastructure by current way will be difficult due to the low birth rate and longevity and aging of infrastructure. In addition to that, risks for the natural disasters in several regions in Japan is also concerned in recent year. Therefore, protecting human life is expected to be impossible against natural disaster. However, there is not yet enough consideration of disaster prevention value in the current road evaluation. Infrastructure in rural or maintenance area is necessary without excess or deficiency by accurate evaluation method to existing roads. On the other hand, there is a case for which a forest road was used as evacuation route when the natural disaster occurred, however there are few studies which try to estimate the value of forest road as arterial road. If forest road is included to arterial road network in same data set, routes which should be connected and maintained with arterial road network can be identified. Procedure of this study is to first build a heterogeneous road network data. Then, the disaster, population and road information on the road network data is combined. after that, network is analyzed based on graph theory and created an preparation improvement plan. As a result, it was found that considering the forest road prevents the isolation of the village in the area when the disaster occurs, and the forest road has disaster prevention value. this study is considered the way of road improvement in the future by adding the forest road to the road network.