Peyton Colee ’21
Faculty Collaborator: Sarah Schanz, Geology
The North Fork of the Teanaway River valley in Central Washington State is home to many landslides, yet the causes and timing of these landslides is currently unknown. Insight into landslide occurrence is crucial for understanding future sliding processes, safety of communities, and habitat genesis of fish species throughout these rivers and tributaries. Here, I use GIS and radiocarbon dating to investigate the spatial extent, density, and age of the landslides. I mapped over 300 landslides in QGIS using Lidar and field investigations to create the first detailed landslide map of the area. Radiocarbon samples were collected for several landslides in the field and are currently being processed to constrain the timing of those landslides. I will then use the Standard Deviation of Slope metric to create a model of landslide ages. Finally, I will calculate the volume of sediment each landslide transported using GIS. The distribution of landslide ages, density, and volume will aid in understanding how these landslides affect fish habitat and diversification in the North Fork.