Patterns and rates of soil movement and shallow failures across several small watersheds on the Seward Peninsula, Alaska

Del Vecchio, Joanmarie; Lathrop, Emma R.; Dann, Julian B.; Andresen, Christian G.; Collins, Adam D.; Fratkin, Michael M.; Zwieback, Simon; Glade, Rachel C.; Rowland, Joel C.

doi:10.5194/esurf-11-227-2023

Title: Patterns and rates of soil movement and shallow failures across several small watersheds on the Seward Peninsula, Alaska

Journal Article · Fri Mar 24 00:00:00 EDT 2023 · Earth Surface Dynamics (Online)

DOI:https://doi.org/10.5194/esurf-11-227-2023· OSTI ID:1963322

; Lathrop, Emma R.; Dann, Julian B.;

; Collins, Adam D.; Fratkin, Michael M.;

; Glade, Rachel C.; Rowland, Joel C.

Thawing permafrost can alter topography, ecosystems, and sediment and carbon fluxes, but predicting landscape evolution of permafrost-influenced watersheds in response to warming and/or hydrological changes remains an unsolved challenge. Sediment flux and slope instability in sloping saturated soils have been commonly predicted from topographic metrics (e.g., slope, drainage area). In addition to topographic factors, cohesion imparted by soil and vegetation and melting ground ice may also control spatial trends in slope stability, but the distribution of ground ice is poorly constrained and hard to predict. To address whether slope stability and surface displacements follow topographic-based predictions, we document recent drivers of permafrost sediment flux present on a landscape in western Alaska that include creep, solifluction, gullying, and catastrophic hillslope failures ranging in size from a few meters to tens of meters, and we find evidence of rapid and substantial landscape change on an annual timescale. We quantify the timing and rate of surface movements using a multi-pronged, multi-scalar dataset including aerial surveys, interannual GPS surveys, synthetic aperture radar interferometry (InSAR), and climate data. Despite clear visual evidence of downslope soil transport of solifluction lobes, we find that the interannual downslope surface displacement of these features does not outpace downslope displacement of soil in locations where lobes are absent (downslope movement means: 7 cm yr^–1 for lobes over 2 years vs. 10 cm yr^–1 in landscape positions without lobes over 1 year). Annual displacements do not appear related to slope, drainage area, or modeled total solar radiation but are likely related to soil thickness, and volumetric sediment fluxes are high compared to temperate landscapes of comparable bedrock lithology. Time series of InSAR displacements show accelerated movement in late summer, associated with intense rainfall and/or deep thaw. While mapped slope failures do cluster at slope–area thresholds, a simple slope stability model driven with hydraulic conductivities representative of throughflow in mineral and organic soil drastically overpredicts the occurrence of slope failures. This mismatch implies permafrost hillslopes have unaccounted-for cohesion and/or throughflow pathways, perhaps modulated by vegetation, which stabilize slopes against high rainfall. Our results highlight the breadth and complexity of soil transport processes in Arctic landscapes and demonstrate the utility of using a range of synergistic data collection methods to observe multiple scales of landscape change, which can aid in predicting periglacial landscape evolution.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Earth & Environmental Systems Science

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1963322

Alternate ID(s):: OSTI ID: 1973824

Report Number(s):: LA-UR-23-24549

Journal Information:: Earth Surface Dynamics (Online), Journal Name: Earth Surface Dynamics (Online) Vol. 11 Journal Issue: 2; ISSN 2196-632X

Publisher:: Copernicus GmbHCopyright Statement

Country of Publication:: Germany

Language:: English

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