Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada
Acknowledgments. The glaciology group at the University of Alaska Fairbanks provided constructive feedback. Comments from R. S. Anderson, B. Hallet, B. Hubbard, J. Tomkin, and S. Tulaczyk improved the manuscript. In most models of glacial erosion, glacier sliding velocity is hypothesized to control...
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Language: | English |
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ftunivalaska:oai:scholarworks.alaska.edu:11122/11312 2023-05-15T16:20:39+02:00 Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada Amundson, Jason M. Iverson, N. R. 2006 http://hdl.handle.net/11122/11312 en_US eng American Geophysical Union Amundson, J. M., and N. R. Iverson (2006), Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada, J. Geophys. Res., 111, F01020, doi:10.1029/2005JF000359. 2156-2202 http://hdl.handle.net/11122/11312 Journal of Geophysical Research Journal of Geophysical Research glacial erosion sliding velocity balance velocity hang heights glaciers Article 2006 ftunivalaska https://doi.org/10.1029/2005JF000359 2023-02-23T21:37:40Z Acknowledgments. The glaciology group at the University of Alaska Fairbanks provided constructive feedback. Comments from R. S. Anderson, B. Hallet, B. Hubbard, J. Tomkin, and S. Tulaczyk improved the manuscript. In most models of glacial erosion, glacier sliding velocity is hypothesized to control rates of bedrock erosion. If this hypothesis is correct, then the elevation difference between hanging and trunk valley floors, the hang height, should be dictated by the relative sliding velocities of the glaciers that occupied these valleys. By considering sliding velocity to be proportional to balance velocity and using mass continuity, hang height is expressed in terms of glacier catchment areas, slopes, and widths, which can be estimated for past glaciers from the morphology of glacial valleys. These parameters were estimated for 46 hanging valleys and their trunk valleys in three adjacent regions of Jasper National Park. The variability in valley morphology can account for 55–85% of the hang height variability if erosion rate scales with balance velocity raised to a power of 1/3. This correspondence is in spite of spatial variations in glaciation duration, snow accumulation rates, and other variables that likely affected hang heights but cannot be readily estimated and so are not included in our formulation. Thus it appears that balance velocity, and by extension, sliding velocity if the two are proportional, may be a reasonable control variable for assessing erosion rate. Yes Article in Journal/Newspaper glacier glaciers Alaska University of Alaska: ScholarWorks@UA Canada Fairbanks Hallet ENVELOPE(6.662,6.662,63.003,63.003) Journal of Geophysical Research 111 F1 |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
glacial erosion sliding velocity balance velocity hang heights glaciers |
spellingShingle |
glacial erosion sliding velocity balance velocity hang heights glaciers Amundson, Jason M. Iverson, N. R. Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada |
topic_facet |
glacial erosion sliding velocity balance velocity hang heights glaciers |
description |
Acknowledgments. The glaciology group at the University of Alaska Fairbanks provided constructive feedback. Comments from R. S. Anderson, B. Hallet, B. Hubbard, J. Tomkin, and S. Tulaczyk improved the manuscript. In most models of glacial erosion, glacier sliding velocity is hypothesized to control rates of bedrock erosion. If this hypothesis is correct, then the elevation difference between hanging and trunk valley floors, the hang height, should be dictated by the relative sliding velocities of the glaciers that occupied these valleys. By considering sliding velocity to be proportional to balance velocity and using mass continuity, hang height is expressed in terms of glacier catchment areas, slopes, and widths, which can be estimated for past glaciers from the morphology of glacial valleys. These parameters were estimated for 46 hanging valleys and their trunk valleys in three adjacent regions of Jasper National Park. The variability in valley morphology can account for 55–85% of the hang height variability if erosion rate scales with balance velocity raised to a power of 1/3. This correspondence is in spite of spatial variations in glaciation duration, snow accumulation rates, and other variables that likely affected hang heights but cannot be readily estimated and so are not included in our formulation. Thus it appears that balance velocity, and by extension, sliding velocity if the two are proportional, may be a reasonable control variable for assessing erosion rate. Yes |
format |
Article in Journal/Newspaper |
author |
Amundson, Jason M. Iverson, N. R. |
author_facet |
Amundson, Jason M. Iverson, N. R. |
author_sort |
Amundson, Jason M. |
title |
Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada |
title_short |
Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada |
title_full |
Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada |
title_fullStr |
Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada |
title_full_unstemmed |
Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada |
title_sort |
testing a glacial erosion rule using hang heights of hanging valleys, jasper national park, alberta, canada |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
http://hdl.handle.net/11122/11312 |
long_lat |
ENVELOPE(6.662,6.662,63.003,63.003) |
geographic |
Canada Fairbanks Hallet |
geographic_facet |
Canada Fairbanks Hallet |
genre |
glacier glaciers Alaska |
genre_facet |
glacier glaciers Alaska |
op_source |
Journal of Geophysical Research |
op_relation |
Amundson, J. M., and N. R. Iverson (2006), Testing a glacial erosion rule using hang heights of hanging valleys, Jasper National Park, Alberta, Canada, J. Geophys. Res., 111, F01020, doi:10.1029/2005JF000359. 2156-2202 http://hdl.handle.net/11122/11312 Journal of Geophysical Research |
op_doi |
https://doi.org/10.1029/2005JF000359 |
container_title |
Journal of Geophysical Research |
container_volume |
111 |
container_issue |
F1 |
_version_ |
1766008605658578944 |