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Permafrost slows Arctic riverbank erosion
Emily C Geyman1, Madison M Douglas2,3, Jean-Philippe Avouac2
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA. egeyman@caltech.edu.
Nature
|October 9, 2024
Summary
Permafrost significantly slows Arctic riverbank erosion, reducing rates by 47%. As permafrost thaws, Arctic river migration may increase by 30-100%, impacting infrastructure and carbon fluxes.
Area of Science:
- Earth and Environmental Science
- Geomorphology
- Climate Science
Background:
- River migration impacts Arctic infrastructure, communities, and global biogeochemical cycles.
- Predicting Arctic river migration is challenging due to conflicting roles of permafrost (slowing vs. accelerating erosion).
Purpose of the Study:
- To develop novel computational methods for high-frequency riverbank erosion detection.
- To quantify the influence of permafrost on river migration rates.
- To model future Arctic river migration under permafrost thaw scenarios.
Main Methods:
- Developed sub-pixel resolution computational methods for detecting riverbank erosion.
- Utilized high-frequency observational data to differentiate thermal (permafrost thaw) and mechanical (river flow) erosion drivers.
- Calibrated and validated a numerical model using data from the Koyukuk River, Alaska.
Main Results:
- Permafrost presence was found to reduce riverbank erosion rates by 47%.
- Erosion is primarily limited by sediment availability and transport capacity, influenced by permafrost's thermal state.
- The developed model accurately simulates observed erosion patterns.
Conclusions:
- Permafrost thaw is a critical factor that will accelerate Arctic river migration.
- Arctic river migration rates are predicted to increase by 30-100% with complete permafrost thaw.
- Findings are crucial for predicting the stability of Arctic infrastructure and ecosystem changes.
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