The basal friction in the modeling of the propagation of shallow landslides – debris flow using r.avaflow
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Resumen
Landslides pose a significant natural hazard around the world and rainfall is the primary triggering factor in Colombia. Many investigations focus on the occurrence of landslides, and the areas affected by their propagation (runout) should also be considered. Landslide runout is influenced by different variables such as cohesion, variable density, erosion, and entrainment, where basal friction plays an important role. This investigation focuses on the influence of basal friction variation in modelling of shallow landslides using r.avaflow. The model is implemented in the Colombian southwestern (Mocoa). Where hours of rain triggered a clustered shallow landslides and chain processes, causing approximately 306 dead people. Some results from modeling shallow landslides under or overestimate the affected areas according to basal friction used. However, analysis indicates that basal friction equal to the internal friction of the material has better results. As well, they indicate that the minimum heights estimated ranging from 0.51 m to 0.61 m offer conservative results to perform hazard zoning of the possible affected areas.
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