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Rivers are key drivers of landscape evolut … Rivers are key drivers of landscape evolution. Transient signals of base level fall propagate up rivers and cause increased erosion rates, which in turn increases channel steepness. In landscapes with horizontally layered rocks, erosion rates vary in both space and time as different layers are eroded and exposed at the surface, complicating how these landscapes respond to base level fall and influencing the topographic expression of different lithologies. Lithologic variations further influence river response by producing sediment, which can armor the channel bed and reduce bedrock erosion. Motivated by the lithologic variability found in the Guadalupe Mountains of Texas and New Mexico, we use the Stream Power with Alluvium Conservation and Entrainment (SPACE) model to test how sediment cover affects channel steepness and erosion rates in horizontally layered rocks. We simulate 1.2 million years of landscape evolution with an imposed uplift rate of 1.0 mm/yr in alternating layers of hard and soft rock, systematically varying the relative amount of alluvial cover. We compare the normalized channel steepness of the model output against the steepness values predicted by the stream power incision model, which is the most commonly used model for interpreting steepness variations in real landscapes. We find that in model runs with sediment cover, channel steepness is systematically higher than predicted by the stream power model in soft rock layers, and lower than predicted in hard rocks. Sediment cover also exerts a strong control on erosion rates. Sediment cover preferentially accumulates over soft rock layers, decreasing erosion rates in these layers while increasing erosion in the unarmored hard rock layers. As the degree of sediment cover is increased, the maximum erosion rate at any given point along the channel decreases. Increasing the sediment cover effectively decreases the erodibility contrast between hard and soft rocks, illustrating the importance of considering the role of sediment when interpreting channel profiles.diment when interpreting channel profiles.
Testing the Influence of Sediment Cover on Channel Steepness and Erosion Rates in Layered Rocks with the SPACE Model +
Austin +
United States +
gguryan@utexas.edu +
Grace +
University of Texas at Austin +
Guryan +
2087218661 +
Image: +
2) Best practices open source Python-based infrastructure +
3) Finite Volume Methods for Surface Dynamics Modeling +
3) Building solvers for sustainable performance +
Texas +
United States +
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18:53:45, 31 March 2023 +
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14:02:02, 1 April 2023 +
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Terrestrial Working Group +
