Presenters-0729
Abstract
Annie Thompson and Kelin Whipple
Arizona State University
Differentiating Spatial and Temporal Uplift Patterns in Mixed Bedrock-Alluvial Channel Network
In mixed bedrock-alluvial channels, temporal changes in uplift rate may be misinterpreted as steady-state spatial uplift rate gradients. To explore this problem, we developed a Landlab component for the Shared Stream Power Model, a landscape evolution model that simultaneously models bedrock erosion, sediment transport, and sediment cover effects on river incision. We compare a spectrum of mixed bedrock-alluvial landscape responses to both uplift conditions. Using these results, we present a framework for distinguishing uplift conditions and constraining sediment effects in natural landscapes.
Viet Bui
University of Florida
Modeling with GeoEnthalpy-Delta in Landlab for a Simulating Delta Evolution over Millennial Timescales
Deltas are complex to model because sediment moves under different rules on the subaerial topset and the subaqueous foreset, and the boundaries between them shift with sediment supply and sea level. GeoEnthalpyDelta, a new Landlab component, borrows the heat conduction inspired (enthalpy) method to handle this complex system. It solves one sediment-conservation equation over the whole delta and switches each node between topset and foreset transport by its elevation relative to sea level. The shoreline and foreset toe then emerge from the solution without explicit tracking. This single domain formulation keeps the model simple and efficient enough to simulate delta evolution over millennial timescales.
Selina Davila Olivera
Oregon State University
Modeling three-dimensional hollow infilling and failure recurrence in forested steeplands
Hollows are depositional zones in steep, unchannelized valleys near the tips of drainage networks. The infilling and failure of hollows have traditionally been modeled using one-dimensional approaches in which hollows accumulate sediment to a critical depth before initiating as shallow landslides. Recent advances in hillslope transport and slope stability modeling provide an opportunity to better represent soil accumulation and three-dimensional failure processes. Here, we present RESET (Recurring Soil Evacuation in Topographic Hollows), a process-based framework that couples soil production, nonlinear sediment transport, and three-dimensional slope stability analysis to estimate hollow failure recurrence intervals (RIs) at large spatial scales. Hollow RIs have implications for sediment and organic carbon budgets throughout watersheds and downstream habitats, particularly as anthropogenic consequences alter failure recurrence intervals.Please acknowledge the original contributors when you are using this material. If there are any copyright issues, please let us know (CSDMSweb@colorado.edu) and we will respond as soon as possible.
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