2022 CSDMS meeting-035

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Modeling the effects of detachment and entrainment of sediment within hyper-arid strike-slip fault landscapes

Tamara Aranguiz, (She/Her/Ella),University of Washington Seattle Washington, United States. tarangui@uw.edu
Alison Duvall, University of Washington Seattle Washington, United States. aduvall@uw.edu

Extreme environments such as arid deserts are underrepresented in landscape evolution models. However, extremely arid environments, with great geomarkers preservation could be key to better understanding the long-term dynamic between surface and upper crustal processes. Recent modeling studies assuming detachment-limited channel conditions demonstrate a range of geomorphic processes and potential paleoseismological indicators in strike-slip environments. Inspired by the hyper-arid conditions and occurrence of strike-slip faults of the Atacama Desert in Northern Chile, we want to test the landscape response to lateral motion of cross-faulting channels covered by alluvial deposits, where sediment transport is likely important. Based on the most recent strike-slip fault model we incorporate and couple the effect of the SPACE (stream power with alluvium conservation and entrainment) 1.0 Landlab component. The results are compared against the output of the same grid but modeled under only detachment-limited conditions to identify the action of a layer of sediment in landscape modification under variable strike-slip fault conditions. The concluding remarks of this work contribute to testing the accuracy of simplifying channel erosion processes to the commonly used stream power equation in strike-slip fault settings.