Impacts of climate change on mass movements in Denali National Park and Preserve, Alaska
Thesis (M.S.) University of Alaska Fairbanks, 2021 The northeastern portion of Denali National Park and Preserve (DENA) is a high-altitude (800 m - 1400 m asl), subarctic (63°N) environment where climate is now changing rapidly. This landscape is underlain by discontinuous permafrost (perennially fr...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/12629 2023-05-15T16:37:41+02:00 Impacts of climate change on mass movements in Denali National Park and Preserve, Alaska Robert, Zena V. Mann, Daniel Farquharson, Louise Romanovsky, Vladimir Meyer, Franz Maio, Chris 2021-08 http://hdl.handle.net/11122/12629 en_US eng http://hdl.handle.net/11122/12629 Department of Geosciences Mass-wasting Global warming Denali National Park and Preserve Climatic changes Landslides Rockslides Master of Science in Geoscience Thesis ms 2021 ftunivalaska 2023-02-23T21:37:57Z Thesis (M.S.) University of Alaska Fairbanks, 2021 The northeastern portion of Denali National Park and Preserve (DENA) is a high-altitude (800 m - 1400 m asl), subarctic (63°N) environment where climate is now changing rapidly. This landscape is underlain by discontinuous permafrost (perennially frozen ground), and the recent surge of mass movements occurring there could be the result of permafrost thaw. Some of these mass movements have the potential to damage the Denali Park Road, alter the flow of groundwater and stream systems, destroy vegetation cover, and endanger the half a million visitors that DENA receives every year. The purpose of this study to understand how mass movements in DENA are being affected by different aspects of climate change, to assess the role of permafrost thaw in their dynamics, to determine when DENA's landscape experienced periods of geomorphic instability in the past, and to better understand the potential trajectory of the landscape changes now occurring. Results show that many ongoing mass movements in DENA are reactivations of landslides that were active earlier in the Holocene (the last 11,700 years). A representative example is the Mile 35 landslide, a complex mass movement initiated along the Park Road during the summer of 2016 after a quiescent period of around 4000 years. I use a combination of remote sensing and field surveys to establish a four-year timeline of this landslide's movements and then compared these observations to records of weather and climate. Results suggest that freeze/thaw processes and extreme rainfall events strongly affect the initiation and subsequent movements of the Mile 35 landslide. Looking farther back in time, lichenometric dating of rockfalls in DENA suggests their frequency peaked 100 to 200 years ago during the initial stages of climate warming at the end of the Little Ice Age. These findings suggest that warming climate triggers a predictable sequence of mass movement responses in DENA, with the initial warming triggering a bout of more ... Thesis Ice permafrost Subarctic Alaska University of Alaska: ScholarWorks@UA Fairbanks |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Mass-wasting Global warming Denali National Park and Preserve Climatic changes Landslides Rockslides Master of Science in Geoscience |
spellingShingle |
Mass-wasting Global warming Denali National Park and Preserve Climatic changes Landslides Rockslides Master of Science in Geoscience Robert, Zena V. Impacts of climate change on mass movements in Denali National Park and Preserve, Alaska |
topic_facet |
Mass-wasting Global warming Denali National Park and Preserve Climatic changes Landslides Rockslides Master of Science in Geoscience |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2021 The northeastern portion of Denali National Park and Preserve (DENA) is a high-altitude (800 m - 1400 m asl), subarctic (63°N) environment where climate is now changing rapidly. This landscape is underlain by discontinuous permafrost (perennially frozen ground), and the recent surge of mass movements occurring there could be the result of permafrost thaw. Some of these mass movements have the potential to damage the Denali Park Road, alter the flow of groundwater and stream systems, destroy vegetation cover, and endanger the half a million visitors that DENA receives every year. The purpose of this study to understand how mass movements in DENA are being affected by different aspects of climate change, to assess the role of permafrost thaw in their dynamics, to determine when DENA's landscape experienced periods of geomorphic instability in the past, and to better understand the potential trajectory of the landscape changes now occurring. Results show that many ongoing mass movements in DENA are reactivations of landslides that were active earlier in the Holocene (the last 11,700 years). A representative example is the Mile 35 landslide, a complex mass movement initiated along the Park Road during the summer of 2016 after a quiescent period of around 4000 years. I use a combination of remote sensing and field surveys to establish a four-year timeline of this landslide's movements and then compared these observations to records of weather and climate. Results suggest that freeze/thaw processes and extreme rainfall events strongly affect the initiation and subsequent movements of the Mile 35 landslide. Looking farther back in time, lichenometric dating of rockfalls in DENA suggests their frequency peaked 100 to 200 years ago during the initial stages of climate warming at the end of the Little Ice Age. These findings suggest that warming climate triggers a predictable sequence of mass movement responses in DENA, with the initial warming triggering a bout of more ... |
author2 |
Mann, Daniel Farquharson, Louise Romanovsky, Vladimir Meyer, Franz Maio, Chris |
format |
Thesis |
author |
Robert, Zena V. |
author_facet |
Robert, Zena V. |
author_sort |
Robert, Zena V. |
title |
Impacts of climate change on mass movements in Denali National Park and Preserve, Alaska |
title_short |
Impacts of climate change on mass movements in Denali National Park and Preserve, Alaska |
title_full |
Impacts of climate change on mass movements in Denali National Park and Preserve, Alaska |
title_fullStr |
Impacts of climate change on mass movements in Denali National Park and Preserve, Alaska |
title_full_unstemmed |
Impacts of climate change on mass movements in Denali National Park and Preserve, Alaska |
title_sort |
impacts of climate change on mass movements in denali national park and preserve, alaska |
publishDate |
2021 |
url |
http://hdl.handle.net/11122/12629 |
geographic |
Fairbanks |
geographic_facet |
Fairbanks |
genre |
Ice permafrost Subarctic Alaska |
genre_facet |
Ice permafrost Subarctic Alaska |
op_relation |
http://hdl.handle.net/11122/12629 Department of Geosciences |
_version_ |
1766027984882368512 |