The damability function: A probabilistic approach to regional landslide dam susceptibility скачать в хорошем качестве

The damability function: A probabilistic approach to regional landslide dam susceptibility

The damability function: A probabilistic approach to regional landslide dam susceptibility analysis applied to the Oregon Coast Range, USA Landslides can dam rivers and require rapid response to mitigate catastrophic outburst floods. In this talk I will describe what landslide dams are including a few recent examples, and present a workflow to map landslide dam formation susceptibility at a regional scale. We define a probabilistic function that combines river valley width and landslide volume to efficiently determine the likelihood of a landslide dam or ‘damability’. We combine damability values with landslide susceptibility to find landslide dam susceptibility. We verify and apply our approach to the Oregon Coast Range, USA and find high susceptibility in river headwaters and generally steeper terrain, which in this case correlates with more resistant lithologies. We also estimate volumes of the potential dammed lakes and find that most rivers with high dam susceptibility are less likely to impound large lakes, because they have low drainage areas. However, widespread susceptibility, and the critical potential impacts from exceptionally large landslides, suggest this hazard should be considered in the Pacific Northwest. The damability function workflow can readily ingest new data and can be applied more broadly to assess future landslide dam hazards. Morgan (2025) The damability function: A probabilistic approach to regional landslide dam susceptibility analysis applied to the Oregon Coast Range, USA, USGS Landslide Hazards Seminar, 12 March 2025. 🔔 Subscribe to ‪@usgs‬ for more science content 🔔 ⬇️ USGS Video ⬇️ 📊 Subscribe to ‪@USGSPresentations‬ for more presentations. 🔨 Subscribe to ‪@USGSTrainings‬ for training/how-to related content.