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タイトル: Evaluation of Road Network from Reliability Perspective : An Accessibility Importance and Network Closure Vulnerability Approach
その他のタイトル: 信頼性に着目した道路ネットワークの評価手法の開発 : 道路の閉塞脆弱性を加味したアクセシビリティ重要度指標
著者: Pokharel, Ramesh
発行日: 2012年9月27日
抄録: The field of reliability research basically focuses on the performance evaluation of system. Natural disaster, extreme weather events, or manmade incidents are the causes of the unreliability of road network which significantly reduce the performance of the road network. Disconnection is the most severe problem after natural disaster. Due to failure on connection; many villages, cities or towns become isolated; difficulties in rescue and evacuation, problem on post disaster support; raises the transportation cost and loss on economy. The severity and weakness in the network are differing from location to location. Identification of weakest location and critical links in a network and prioritizing them for the improvement projects is the aim of the evaluation methodology. Despite the growing body of literature on the reliability of road network, existing studies have provided little evidence on practical application. This thesis presents the review of reliability and vulnerability of road network studies, proposes road network evaluation methodology and presents the application results of the evaluation methodology. The context of review is based on practicability which consist two parts. First part covers the literature taxonomy under the broad range of relevant criteria which includes conceptual studies, mathematical theory, evaluation methodology, descriptive studies, application or case studies, and the ways to improve reliability. Second part presents a detailed assessment of existing methodology of evaluation under the multidimensional perspective of practicability such as evaluation index, socioeconomic impact, area isolation, theoretical and practical importance, data requirement, calculation time and process, area wise impact of single link failure and probability of disaster. Although various dimensions were considered in the literature existing evaluation methodologies fail to consider the cumulative effect of multiple link closure condition. Proposed evaluation methodology compares the road network links based on their performance in the network in two stages. The first stage identifies and prioritizes the important links for the network connection and second stage identifies and prioritizes the important links to increase the network performance. The methodology evaluates the socioeconomic impact of upgrading the possible closed links as an accessibility index of the village, city or town with respect to major service centre (large city). Methodology considers the cumulative effect of multiple link closure and network redundancy. A method of sensitivity analysis has been employed to identify the critical population and critical distance which treats the very low populated and very nearest city/village or town equally. The methodology is applied in regional road network closure which is affected by large scale disaster in Tohoku Region, Japan and rural road network closure in rainy season in Syangja district, Nepal. The methodology can be applied to any kinds of network closure event and any level of network i.e. the different level of road administrative authority can apply to the road network under their area of responsibility. This methodology is very useful for the identification of important link, improvement against any kinds of disaster events and the disaster preparedness activities.
内容記述: 報告番号: ; 学位授与年月日: 2012-09-27 ; 学位の種別: 修士 ; 学位の種類: 修士(工学) ; 学位記番号: ; 研究科・専攻: 工学系研究科社会基盤学専攻
URI: http://hdl.handle.net/2261/52643
出現カテゴリ:025 修士論文
1130225 修士論文(社会基盤学専攻)

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