Journal
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
Volume 127, Issue 8, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022JF006745
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Funding
- NASA [80NSSC22K0465]
- US National Science Foundation [1831623, 2026951, 2104102]
- H2020 Marie Skodowska-Curie Actions [833132]
- Marie Curie Actions (MSCA) [833132] Funding Source: Marie Curie Actions (MSCA)
- Direct For Computer & Info Scie & Enginr
- Office of Advanced Cyberinfrastructure (OAC) [2104102] Funding Source: National Science Foundation
- Directorate For Geosciences
- Div of Res, Innovation, Synergies, & Edu [2026951] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1831623] Funding Source: National Science Foundation
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This article investigates the impact of bedrock landslides on topography and sediment dynamics, highlighting the significance of interactions between landslides and sediment dynamics for landscape evolution and response to environmental change.
Bedrock landslides shape topography and mobilize large volumes of sediment. Yet, interactions between landslide-produced sediment and fluvial systems that together govern large-scale landscape evolution are not well understood. To explain morphological patterns observed in steep, landslide-prone terrain, we explicitly model stochastic landsliding and associated sediment dynamics. The model accounts for several common landscape features such as slope frequency distributions, which include values in excess of regional stability limits, quasi-planar hillslopes decorated with straight, closely spaced channel-like features, and accumulation of sediment in valley networks rather than on hillslopes. Stochastic landsliding strongly affects the magnitude and timing of sediment supply to the fluvial system. We show that intermittent sediment supply is ultimately reflected in topography. At dynamic equilibrium, landslide-derived sediment pulses generate persistent landscape dynamism through the formation and breaching of landslide dams and epigenetic gorges as landslides force shifts in channel positions. Our work highlights the importance of interactions between landslides and sediment dynamics that ultimately control landscape-scale response to environmental change.
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