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Highlights: •] We observed meltwater-induced debris flows at the Great Kobuk Sand Dunes, Alaska. •] Thawing niveo-aeolian deposits supported by solar insolation trigger debris flows. •] Flows form on dune lee slopes and resemble slurries of sand mixed with liquid water. •] Measured air and surface temperatures never climbed above freezing at field sites. •] Martian dunes may undergo seasonal analogous debris flow processes. ABSTRACT FROM AUTHOR]; Copyright of ICARUS is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual...
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Multi-temporal image analysis of very-high-resolution historical aerial and recent satellite imagery of the Ahnewetut Wetlands in Kobuk Valley National Park, Alaska, revealed the nature of thaw lake and polygonal terrain evolution over a 54-year period of record comprising two 27-year intervals (1951-1978, 1978-2005). Using active-contouring-based change detection, high-precision orthorectification and co-registration and the normalized difference index, surface area expansion and contraction of 22 shallow water bodies, ranging in size from 0.09 to 179 ha, and the transition of ice-wedge polygons from a low- to a high-centered morphology were quantified. Total surface area decreased by only 0.4% during the first...
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Highlights: •] We observed meltwater-induced debris flows at the Great Kobuk Sand Dunes, Alaska. •] Thawing niveo-aeolian deposits supported by solar insolation trigger debris flows. •] Flows form on dune lee slopes and resemble slurries of sand mixed with liquid water. •] Measured air and surface temperatures never climbed above freezing at field sites. •] Martian dunes may undergo seasonal analogous debris flow processes. ABSTRACT FROM AUTHOR]; Copyright of ICARUS is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual...
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