Using multitemporal lidar to better understand landslide and debris-flow hazards in western Oregon

In 2017, the Eagle Creek fire scorched the western portion of the Oregon side of the Columbia Rive Gorge (CRG). In 2021 and 2022 atmospheric river type storms triggered many post-fire debris flows. The purpose of this research/paper is to evaluate pre- and post-2017 Eagle Creek Fire debris flows in the WCRG (western Columbia River Gorge) study area using multi-temporal bare earth lidar digital elevation model. To understand the difference between pre-fire debris flows and post-fire debris flows in the WCRG, multiple sources of data were collected and analyzed. The primary data sets were field data collected after storms, orthophotos, and the multitemporal lidar data sets used to map the debris flows.