Skip to main content

Dinwiddie, Cynthia L.

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...
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...
thumbnail
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...
View more...
ScienceBase brings together the best information it can find about USGS researchers and offices to show connections to publications, projects, and data. We are still working to improve this process and information is by no means complete. If you don't see everything you know is associated with you, a colleague, or your office, please be patient while we work to connect the dots. Feel free to contact sciencebase@usgs.gov.