A Preliminary Site Selection Study on Watershed Public Facilities as Multi-use Detention Basin: An Environmental Efficiency Perspective

• Main Authors: Chun-YinMan, 萬俊然
• Other Authors: Hsueh-Sheng Chang
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/ka2bsv

碩士 === 國立成功大學 === 都市計劃學系 === 107 === The frequency of urban flooding and loss have been severely raised over the past decade. The recent flood mitigation measurements have gradually resorted to using urban land as the runoffs allocation unit. However, to wholly practice the strategy in the highly developed urban areas, it is required to overcome a long-term rezoning procedures with enormous land expropriation fees. Thus, using existing public facilities as detention basins has been widely considered as a effecient measure to reduce the risk by the extremely and uncertainly rainfall events. In terms of the functions of detention basins, recent researches pays an increasing attention to its synthesis physiological and psychological well-being as well as the ecosystem services. This form of detention basin namely Multi-use Detention Basin(MDB). Although the benefits of MDB have been widely discussed, there is a limited literature research on the site selection problem on MDB in the decision making context. This study established a two-stages screening and evaluation MDB site selection framework based on the environmental efficiency perspective. Data envelopment analysis(DEA) and cross-efficiency evaluation is applied to build the best alternative site ranking, and then compared with the traditional single flood mitigation efficiency perspective on detention basin site ranking. The result indicated that the two decision perspectives showed a certain trade-off relation on the MDB site ranking by the reason of geographical and hydrological heterogeneity. Slack variable analysis was further applied to identify the efficiency difference between the condidate sites. This study proposed a new MDB site selection framework, in terms of the urban well-being and environmental efficiency perspective.