Pedestrian tsunami evacuation results for three California probabilistic tsunami hazard zones and four travel speeds (shapefiles) and impaired walk travel times for all zones by parcel land-use and flow depth class (tables)

These datasets supports the conclusions in the journal article entitled "Variations in community evacuation potential related to average return periods in probabilistic tsunami hazard analysis" as described in the abstract below: Tsunami risk management requires strategies that can address multiple sources with different recurrence intervals, wave-arrival times, and inundation extents. Probabilistic tsunami hazard analysis (PTHA) provides a structured way to integrate multiple sources, including the uncertainties due to the natural variability and limited knowledge of sources. PTHA-based products relate to specific average return periods (ARP) and while there has been considerable attention paid to ARP choice for building codes, guidance on ARP choice to support evacuation planning and related land-use is lacking. We use the State of California (USA) coastal communities as a case study to explore the use of geospatial analysis and pedestrian-evacuation modeling for comparing the societal implications of tsunamis based on evacuation areas that reflect 475-year, 975-year, and 2,475-year ARPs. Results demonstrate that changes in PTHA ARP had a substantial effect on the number of taxlot parcels in tsunami evacuation areas, but not on the primary land-use of these parcels or which communities had the highest number of exposed parcels. Composite PTHA maps provided high-level insights on hazard exposure and identified dominant sources; however, disaggregated PTHA outputs that reflect single source parameters (e.g., wave-arrival time) were necessary to quantify evacuation potential from local and distant tsunamis. Framing changes in ARP assumption based on changes in the number, land-use type, and potential evacuation challenges of parcels in evacuation areas can provide valuable insight on the real-world implications of which ARP to use in land-use or evacuation planning. These data support the following publication: Wood, N., Peters, J., Wilson, R., Sherba, J., and Henry, K., 2020. Variations in community evacuation potential related to average return periods in probabilistic tsunami hazard analysis. International Journal of Disaster Risk Reduction.

本数据集支撑下述期刊论文的研究结论，该论文题为《概率海啸危险性分析中与平均重现期相关的社区疏散潜力差异》，摘要如下：海啸风险管理需要能够应对不同重现周期、波抵达时间及淹没范围的多源灾害应对策略。概率海啸危险性分析（Probabilistic Tsunami Hazard Analysis，PTHA）提供了结构化方法以整合多源灾害，其中涵盖了自然变异性与源认知局限所带来的不确定性。基于PTHA的成果与特定平均重现期（Average Return Period，ARP）相关；尽管建筑规范领域已对ARP的选取给予了广泛关注，但针对疏散规划与相关土地利用的ARP选取指南仍存在空白。本研究以美国加利福尼亚州沿海社区为案例，探索利用地理空间分析与行人疏散模型，基于对应475年、975年及2475年ARP的疏散区域，对比不同海啸情景的社会影响。研究结果显示，PTHA的ARP调整对海啸疏散区域内的计税宗地数量存在显著影响，但并未影响这些宗地的主要土地利用类型，也未改变暴露宗地数量最多的社区名单。综合PTHA地图可提供灾害暴露的高层级认知，并识别出主导灾害源；但要量化本地与远程海啸的疏散潜力，需依托反映单一源参数（如波抵达时间）的细分PTHA输出成果。基于疏散区域内宗地数量、土地利用类型与潜在疏散挑战的变化来调整ARP假设，可为土地利用或疏散规划中ARP选取的实际应用价值提供宝贵参考。本数据集支撑下述已发表论文：Wood, N.、Peters, J.、Wilson, R.、Sherba, J.与Henry, K.，2020年。《概率海啸危险性分析中与平均重现期相关的社区疏散潜力差异》。《国际灾害风险减少期刊》（International Journal of Disaster Risk Reduction）。