Annual landslide risk and effectiveness of risk reduction measures in Shihmen watershed, Taiwan

摘要: Landslide risk analysis procedures in this study could evaluate annual landslide risk, and assess the effectiveness of measures. Risk encompassing hazard, vulnerability, resilience capacity was used to risk. First, spatial, temporal, area probabilities were joined estimate probability landslides with an exceeding a certain threshold each slope unit. Second, different elements assigned corresponding values vulnerabilities calculate expected property life losses. Third, capacities communities calculated based on scores obtained through community checklists weights items, including “the participation experience disaster prevention drill,” “real-time monitoring mechanism community,” “autonomous residents,” “disaster volunteer.” Finally, probabilities, losses, combined Shihmen watershed. In addition, risks before after implementation measures compared determine benefits measures, subsequently benefit–cost performed. Communities high ratios included Hualing, Yisheng, Siouluan, Gaoyi. The watershed as whole had ratio far greater than 1, indicating investment cost. results factor sensitivity revealed changes mortality rates would increase uncertainty that raise interest or reduction cycle decrease ratio. However, these did not reverse cost-effective inference.