In my dissertation, I've taken a geomorphic deep-dive into the post-fire response of the Columbia River Gorge in Oregon—a region infamous for its frequent production of debris flows and rockfall, which accumulate in talus piles and fans and inundate transportation corridors. Understanding these rate and magnitude of these hazards is vital in developing mitigation strategies, and key in characterizing bedrock landscape evolution processes.
I highlight these projects (and more) below!
POST-FIRE DEBRIS FLOWS IN OREGON
In 2017, the Eagle Creek Fire burned 200 square kilometers of the Columbia River Gorge (CRG).
I worked with collaborators from DOGAMI, Oregon State University, and USGS to create pre- and post-fire debris flow inventories using lidar from 2009, 2018, 2021, and 2022—the first of its kind for Oregon.
Many of the debris flows in the region occurred in the Dodson Catchments, where "post-fire" events were initaiting from burned and unburned areas. In work recently published in Science Advances, I show transient conditions here permit debris flow reloading on the order of decades, reducing the sensitivity to post-fire conditions.
(contrary to expectations, no post-fire debris flow occurred in the channel to the right)
photo credit: ODOT
BEDROCK LANDSCAPE EVOLUTION
I am interested in analyzing basin and fan morphology to track the evolution from rockfall- to debris-flow-dominated erosional processes along the steep basalt escarpment.
POST-FIRE DEBRIS FLOW VOLUME TOOL
I was contracted by the Oregon Department of Transportation to create a tool to model relative reloading rates in post-fire landscapes in Oregon. To do so, I use previously constrained empirical relationships between erosion rate and slope to calculate basin-averaged hazard indices.
I plan to validate the model with our post-fire debris flow inventory from the CRG, as well as other landslide observations from Oregon
(e.g., Selander et al., 2025).
SLOT CANYON FORMATION
Myself and two fellow PhD candidates—Mike Robinson (UNR) and Brandon Fong (Penn State)—have taken advantage of a natural experiment in northern Arizona to isolate the influence of lithology in enabling slot canyon formation.
DEBRIS FLOW AVULSION DYNAMICS
With a grant that provided training and field equipment from the UW RAPID Program, I used UAV-based mapping to collect lidar data over a debris flow avulsion site in Klukwan, AK for the KUTI project. Myself and a UO undergraduate are currently working to difference the point cloud data with previously collected Structure from Motion and lidar datasets. I also assisted with installation of infrasound sensors, seismic sensors, and game cameras.
COMMUNITY OUTREACH
With the KUTI project, I have had the opportunity to share our science with and learn from stakeholders, regional and local environmental groups, and tribal community members.
These conversations sparked the transfer of knowledge about regional hazards, climate, and geology that has been critical to the project.
HURRICANE HILARY RESPONSE
Following Hurrican Hilary in November 2023, the Center for Land Surface Hazards (CLaSH) assembled a team of early-career scientists (including myself) and the UW RAPID facility to capture the aftermath of the large, unprecedented rain event in Death Valley.
We collected observations and terrestrial laser scanning lidar surveys along affected alluvial fans using instruments.
SMALL, SHALLOW LANDSLIDES
For my senior thesis, I investigated 80 rainfall-triggered shallow landslides that occurred in 2019—just two years after a storm triggered nearly 600 shallow landslides. I used differential lidar to map the events, analyzed rainfall data, and implemented 1-D hydrologic models to compare the events.
VADOSE ZONE MONITORING
As a research assistant for the Eel River Critical Zone Observatory, I made monthly visits to two field sites in northern California to measure moisture levels from 3 to 30 meters below the subsurface to track vadose (or unsaturated) zone wetting and drying during the 2021 drought. Check out Water Resources Research for more!
SOIL MOISTURE DYNAMICS
Also during my research assitantship stint, I collected soil moisture samples at the Eel River CZO after rain events for stable isotope analysis. We were interested to compare rain, soil, and tree isotopic signatures to understand where water in the near-surface is going.
msander9 [at] uoregon [dot] edu