PROPOSAL OF AN EVALUATION METHOD FOR RESILIENCE IMPROVEMENTS CONSIDERING LIFELINE SUPPLY STOPPAGES

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  • ライフラインの途絶に備えた対策がもたらす地域のレジリエンス向上効果の評価手法の提案
  • ライフラインの途絶に備えた対策がもたらす地域のレジリエンス向上効果の評価手法の提案 : 地域レベルのエネルギーシステムによるレジリエンス向上効果の貨幣価値評価
  • ライフライン ノ トゼツ ニ ソナエタ タイサク ガ モタラス チイキ ノ レジリエンス コウジョウ コウカ ノ ヒョウカ シュホウ ノ テイアン : チイキ レベル ノ エネルギー システム ニ ヨル レジリエンス コウジョウ コウカ ノ カヘイ カチ ヒョウカ
  • 地域レベルのエネルギーシステムによるレジリエンス向上効果の貨幣価値評価
  • Evaluation of monetary value for resilience improvements by introducing a community energy system

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In urban areas where population and city functions are aggregated, there are calls for the construction of business continuity districts, in which energy supply is secured in times of disaster. A decentralized and self-reliant community-level energy network is expected to contribute to improving resilience and regional vitalization, as well as to reducing carbon emissions. However, the initial investment is high and the stakeholders involved are diverse, creating potential obstacles to the introduction of such an energy network because the necessary measures are of larger scale than a simple construction project. Prior studies have shown the need for accurate recognition of non-energy benefits (NEBs) in addition to energy benefits such as energy cost savings. Moreover, evaluation methods for various co-benefits have been proposed. Yet, NEBs accrued through risk reduction have not been evaluated with respect to temporal changes in business and daily life activities associated with lifeline utilities such as electricity, water, and gas.<br> In this study, we conducted a questionnaire survey of city residents and non-manufacturing workers. Using the data from the questionnaire, we developed an evaluation method for improvements in resilience. In addition, we verified the effect of improving resilience through a case study of a real urban district and a housing complex district.<br> The results of this research are summarized below.<br> (1) Proposal of an evaluation method for resilience in the business sector<br> In the questionnaire survey, we asked non-manufacturing workers about the effect on business activities of lifeline stoppages (electricity, water, and gas) and derived a “Resiliency Factor” according to the type of business. Then, we proposed a method for resilience improvements based on Resiliency Factor and a recovery curve for business activity according to the lifeline stoppage time, and we plotted a recovery curve for business activity according to the lifeline stoppage time. In addition, we expressed the resilience improvement in the business sector in monetary terms.<br> (2) Proposal of an evaluation method for resilience in the housing sector<br> In the questionnaire survey, we asked residents about the losses incurred as a result of electric power failure. Then, we derived a basic unit of loss due to electric power failure according to stoppage time. This basic unit was then used in an estimation model considering housing type and location to assess resilience improvements in the housing sector in monetary terms.<br> (3) Case study<br> We performed a case study of the effect on resilience of introducing a community energy network under the assumption of a large-scale earthquake. In the evaluation, the Tamachi Station district was taken as an example of urban areas and the Hamamidaira housing complex district was taken as an example of areas around existing housing complexes We found that by introduction of the community energy system, the Tamachi Station district would accrue NEBs of 140 million yen per year and the Hamamidaira housing complex district would accrue NEBs of 5.11 million yen per year.

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