A LINEAR PROGRAMMING MODEL TO DESIGN A ROAD NETWORK ROBUST AGAINST THE DISRUPTION OF ROADS AT THE TIME OF DISASTER

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  • 災害時の代替経路の確保を考慮した道路ネットワークの構築法
  • サイガイジ ノ ダイタイ ケイロ ノ カクホ オ コウリョ シタ ドウロ ネットワーク ノ コウチクホウ

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Abstract

The aim of this paper is to propose a linear programming (LP) model to answer what roads should be improved to make a road network robust against the disruption of roads at the time of disaster. To this end, we first give a rigorous definition of an alternative route, which requires that an alternative route should share few roads with a usual route, and the travel time along an alternative route should be almost the same as that along a usual route. Then, a road network having many alternative routes would be robust against the disruption of roads, and the LP model is designed for ensuring many alternative routes for various origin and destination (OD) pairs. The Tokai earthquake would cause great damage to the Tokai area including Aichi prefecture. And so, we applied the LP model, for example, to problems with OD pairs of (i) Aichi and Osaka prefectures and (ii) major cities in Aichi and Shizuoka prefectures. In the case of (i) with the data of 1995, we obtained an alternative route similar to Shinmeishin highway, which opened in 2005 and is actually an alternate to Meishin highway. Hence, it can be said that this result indicates the effectiveness of the LP model. In the case of (ii) with the data of 2003, we obtained alternative routes along the coast. This result seems to be strongly affected by the structure of the road network in Shizuoka prefecture. It is socially recognized that Shintomei highway, which opened in 2012, drastically improved the structure. Therefore, we recalculated the result with the data of Shintomei highway. Then, we additionally obtained a suitable alternative route between Hamamatsu and Shizuoka. This result would theoretically support the social recognition for Shintomei highway.

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