Numerical Simulation of Supraglacial Debris Mobility: Implications for Ablation and Landform Genesis
نویسندگان
چکیده
Supraglacial debris does not remain fixed atop ablating ice, but can move across the ice surface as supraglacial topography evolves. This active movement (distinct from passive due to underlying motion) affects landform genesis well rate and spatial distribution of ablation. While observations transport evolving are abundant, models these coupled processes over timescales decades longer few. Here I adapt a numerical model ablation downslope simulate evolution an idealized debris-covered glacier on timescale complete de-icing. The includes that depends thickness hillslope-scale function scales non-linearly with slope angle. Ice evolve time, allowing simulation de-icing construction in test-section. produces relief leads topographic inversions consistent conceptual hummocky genesis. Model results indicate postglacial hummocks depend relationship between characteristic for transport, which is defined index mobility. When mobility high, rapid subdued. low, more pronounced produced, remains An intermediate appears optimize both de-icingcompared highly-mobile immobile debris. enhancement could contribute observed anomalous rates some glaciers.
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2021
ISSN: ['2296-6463']
DOI: https://doi.org/10.3389/feart.2021.710131