都市のコンパクト化の費用評価: 長岡市を事例とした都市のコンパクト化の評価に関する研究 その2

摘要

本研究は、都市のコンパクト化政策を総合的に評価することを目的とした一連の研究の一部であり、前稿に続く第二稿にあたる。ケーススタディの対象地域は新潟県長岡市(2005,6年の合併前の旧長岡地域)である。前稿では、コンパクト化過程とその後の運用時のCO_2排出量を評価するための原単位を計算し、コンパクト化の度合いの異なる3つのシナリオの評価を行い、都市のコンパクト化が低炭素社会に向けたCO_2排出量削減に一定の効果があることを確認した。%Compact city is thought as an important policy so as to cut down the urban maintenance management cost. But, the process of the urban compactization assumes to need a lot of cost. We should evaluate the compact city not only by the operation cost but also by the long term cost including the process of the urban compactization. In this case study, we created the 3 scenarios for the Nagaoka city toward the year of 2050, which are different in the degree of compactness, and evaluated them both in the compatcization period and the following operating period by the construction cost of urban facilities, infrastructure and all buildings of the target area including new built, retirement, and maintenance. The result is that the middle compact Polycentric scenario spend 19 years and the most compact Monocentric scenario spend 23years to recover the cost of compactization. buildings ,and compensation cost for moving) to realize the compact city of Polycentric scenario. The construction cost and compensation cost for peoples who move from suburbs to downtown could recover for 12yeas by saving the maintenance management cost and increasing property tax, if the compensation were for the values of the lands the moving people had in the suburbs before moving.