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Insights from the topographic characteristics of a large global catalog of rainfall-induced landslide event inventories
Natural Hazards and Earth System Sciences ( IF 4.2 ) Pub Date : 2021-09-02 , DOI: 10.5194/nhess-2021-250
Robert Emberson , Dalia Kirschbaum , Pukar Amatya , Hakan Tanyas , Odin Marc

Abstract. Landslides are a key hazard in high-relief areas around the world and pose a risk to population and infrastructure. It is important to understand where landslides are likely to occur in the landscape to inform local analyses of exposure and potential impacts. Large triggering events such as earthquakes or major rain storms often cause hundreds or thousands of landslides, and mapping the landslide populations generated by these events can provide extensive datasets of landslide locations. Previous work has explored the characteristic locations of landslides triggered by seismic shaking, but rainfall induced landslides are likely to occur in different parts of a given landscape when compared to seismically induced failures. Here we show measurements of a range of topographic parameters associated with rainfall-induced landslides inventories, including a number of previously unpublished inventories which we also present here. We find that average upstream angle and compound topographic index are strong predictors of landslide headscarp location, while local relief and topographic position index provide a stronger sense of where landslide material may end up (and thus where hazard may be highest). By providing a large compilation of inventory data for open use by the landslide community, we suggest that this work could be useful for other regional and global landslide modelling studies and local calibration of landslide susceptibility assessment, as well as hazard mitigation studies.

中文翻译:

从降雨引起的滑坡事件清单的大型全球目录的地形特征中得出的见解

摘要。山体滑坡是世界各地高海拔地区的主要灾害,对人口和基础设施构成威胁。重要的是要了解景观中可能发生滑坡的位置,以便为当地的暴露和潜在影响分析提供信息。地震或大暴雨等大型触发事件通常会导致数百或数千次滑坡,绘制这些事件产生的滑坡种群可以提供大量的滑坡位置数据集。先前的工作已经探索了由地震引发的滑坡的特征位置,但与地震引发的故障相比,降雨引发的滑坡很可能发生在给定景观的不同部分。在这里,我们展示了与降雨诱发的滑坡清单相关的一系列地形参数的测量结果,包括一些以前未发布的清单,我们也在这里展示。我们发现平均上游角度和复合地形指数是滑坡头崖位置的有力预测因子,而局部地势和地形位置指数提供了更强烈的滑坡物质可能结束位置(因此危害可能最高)的感觉。通过提供大量可供滑坡社区公开使用的清单数据汇编,我们建议这项工作可用于其他区域和全球滑坡建模研究和滑坡敏感性评估的本地校准,以及减灾研究。而局部地势和地形位置指数提供了更强烈的滑坡物质可能最终到达的位置(以及危险可能最高的位置)。通过提供大量可供滑坡社区公开使用的清单数据汇编,我们建议这项工作可用于其他区域和全球滑坡建模研究和滑坡敏感性评估的本地校准,以及减灾研究。而局部地势和地形位置指数提供了更强烈的滑坡物质可能最终到达的位置(以及危险可能最高的位置)。通过提供大量可供滑坡社区公开使用的清单数据汇编,我们建议这项工作可用于其他区域和全球滑坡建模研究和滑坡敏感性评估的本地校准,以及减灾研究。
更新日期:2021-09-02
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