都市・地域の持続可能性評価の方法論

抄録

Objective. Many indicators for sustainability of a city have been developed, but they still have some problems to evaluate sustainability including various behaviors on the city. This paper aims to propose a new model for evaluating sustainability of a city which based on a concept of Triple Bottom Line（TBL）including three indicators of society, economy and environment, and Quality of Life（QOL）.

Results and Discussion. From the review of the existing sustainability indicators, three issues became clear in order to improve the evaluating system. 1）A detailed description of the transmission mechanism of the environmental impact, 2）creating integrated indicators including three indicators which society, economy and environment and 3）calculating on long-term until 2050 to reflect the effect of urban infrastructural stock. This study developed the new model based on TBL concept for evaluating sustainability of the city in 2050. Case study was carried out in several cities. One of the results in the case of Nagoya city in Japan revealed that all the TBL indictors would become lower than that in current situation in the whole city, especially it would become severe impact as further away from the city center due to increasing of infrastructure maintenance cost per person.

Conclusions. This study cleared that sustainability indicators should be contained with TBL indicators which are society, economy and environment considering life cycle assessment approach, because a city can be thought of the aggregation of variety stocks as a result of human activity. Continued development of a new model for evaluating sustainability will support the realization of sustainable society for the next generation.