Arctic soil patterns analogous to fluid instabilities

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Authors

Rachel C Glade, Michael Fratkin, Mehdi Pouragha, Ali Seiphoori , Joel Rowland

Abstract

Slow-moving arctic soils commonly organize into striking large-scale spatial patterns called solifluction terraces and lobes. Though these features impact hillslope stability, carbon storage and release, and landscape response to climate change, no mechanistic explanation exists for their formation. Everyday fluids—such as paint dripping down walls—produce markedly similar fingering patterns resulting from competition between viscous and cohesive forces. Here we use a scaling analysis to show that soil cohesion and hydrostatic effects can lead to similar large-scale patterns in arctic soils. A large new dataset of high-resolution solifluction lobe spacing and morphology across Norway supports theoretical predictions and indicates a newly observed climatic control on solifluction dynamics
and patterns. Our findings provide a quantitative explanation of a common pattern on Earth and other planets, illuminating the importance of cohesive forces in landscape dynamics. These patterns operate at length and time scales previously unrecognized, with implications toward understanding fluid-solid dynamics in particulate
systems with complex rheology.

DOI

https://doi.org/10.31223/X5S029

Subjects

Physical Sciences and Mathematics

Keywords

climate, soil, instabilities, patterns, granular, solifluction

Dates

Published: 2021-01-22 10:53

Last Updated: 2021-04-07 12:32

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License

CC BY Attribution 4.0 International

Additional Metadata

Data Availability (Reason not available):
Data not yet available, waiting for approval from Los Alamos National Lab

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