Filters: Tags: Monitoring 5-Physical Science (X) > partyWithName: National Park Service Natural Resource Program Center National Park Service (X)
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Tags: Monitoring 5-Physical Science
Retrogressive thaw slumps (RTS) are caused by thaw of massive ground ice on slopes and combine subsidence, mass movement, and water erosion. They can expose several hectares of bare soil that is susceptible to erosion into nearby water bodies. In the summer of 2010, oblique aerial-photographs of 24 selected RTS in Noatak National Preserve (NOAT) and Gates of the Arctic National Park and Preserve (GAAR) were taken with a hand-held, 35-mm digital camera. This photography was used to create high-resolution three-dimensional topographic models with photographic overlay. Accurate ground control was obtained at 14 of the slumps by surveying the location of temporary targets that were captured on the aerial photographs...
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Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: MONITORING 5-PHYSICAL SCIENCE
Categories: Data,
Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Monitoring 5-Physical Science
Categories: Data,
Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Monitoring 5-Physical Science
A systematic survey was made of three National Park Service units in northern Alaska for active-layer detachments (ALDs) and retrogressive thaw slumps (RTS) using high-resolution satellite imagery from 2006 and 2008. ALDs and RTS develop by localized thaw of permafrost, and have the potential to expose significant areas of soil to erosion. I identified 22 ALDs in Bering Land Bridge National Preserve, 22 in Cape Krusenstern National Monument, and 14 in Kobuk Valley National Park. These ALDs are typically 10 to 30 m wide and up to 300 m long, and on the average expose about 1000 sq m of bare soil each, amounting to a total area of about 6 ha in the 3 NPS units. The ALDs occur on long, well vegetated slopes of moderate...
Categories: Data,
Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: MONITORING 5-PHYSICAL SCIENCE
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