[A-HW20] Integrated Watershed Management under the Future Extreme Disaster

[AHW20-P04] Combining the three-dimensional matrix of hazard, vulnerability, and temporal factors for the assessment of spatiotemporal variations in disaster risk

*Zheng-Wei Wang¹, Cheng-Chia Huang² (1.Postgraduate, Department of Water Resources Engineering and Conservation, Feng Chia University, Taiwan (R.O.C.), 2.Assistant Professor, Department of Water Resources Engineering and Conservation, Feng Chia University, Taiwan (R.O.C.))

Keywords:Sedimentation, Hazard, Vulnerability, Risk, Disaster management

In recent years, the probability of flash floods has increased due to the impact of climate change, leading to more frequent and severe sedimentation issues to pose challenges to disaster management. This study takes Taoyuan City in Taiwan, East Asia, as a case, and aims to enhance the capacity of disaster management by establishing a three-dimensional risk matrix that considers the spatiotemporal changes of hazard and vulnerability. The integration of this study is more comprehensive. The hazard index includes various sedimentation disaster types such as floods, debris flows, landslides, and river erosion and deposition by using the field data and a numerical model, SRH-2D (Sediment and River Hydraulic-Two Dimension model). The vulnerability index consists of four aspects: exposure, disaster reduction preparedness, coping capacity, and recovery ability. It covers elements such as population conservation, population ratios, disaster reduction projects, land use, disaster prevention, and medical capacity. The proposed approach allows an in-depth analysis of spatiotemporal variations in disaster characteristics, allowing for the assessment of annual fluctuations in risk and elucidating the efficacy of past improvement interventions and engineering measures. The risk assessment framework delineated plays a pivotal role in elucidating the strengths and vulnerabilities of each region, thereby aiding in the prioritization of disaster-prone areas for targeted interventions within the confines of limited disaster mitigation capacity. By maximizing the efficiency and effectiveness of disaster management practices, this system contributes significantly to enhancing community resilience and minimizing the adverse impacts of disasters.