2025 CSDMS meeting-138: Difference between revisions

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|CSDMS meeting abstract title=The role of diffusion on drainage divide migration reversibility
|Working_group_member_WG_FRG=Terrestrial Working Group
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{{CSDMS meeting abstract template 2025
|CSDMS meeting abstract=Drainage divides drive flow patterns and structure the landscape, but they are not always steady. Drainage divide migration may occur for various reasons including asymmetric uplift, horizontal tectonic advection, or differential erosion rates driven by contrasting lithologies or orographic precipitation. Drainage divide migration can lead to stream capture and reorganization of the drainage network, with consequences for landform evolution, regional climate and ecosystems.
Local climatic conditions and associated vegetation are often aspect-dependent, which can trigger asymmetric erosion rates and the migration of a drainage divide. Moreover, this aspect contrast may evolve over time. We ask how a time-varying aspect contrast in erosion rates may affect drainage divide. We study numerically how the drainage divide migrates in response to a cyclic aspect contrast in erodibility, which represents a possible contrast in climate or vegetation. We find that the drainage divide migrates in response to an imposed contrast in erodibility, but in some cases, does not fully return to its initial equilibrium position when the contrast is removed. The residual shift appears to be related to the role of hillslope diffusion in the model. When diffusion is slow relative to fluvial erodibility, the shift is more important, suggesting that hillslope diffusion near the ridges is an important process for reversing divide migration. Further work is needed to elucidate how diffusion controls the reversal of divide migration.
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Latest revision as of 11:23, 13 May 2025


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