An Assessment of the river ice break-up season in Canada
Graduate A return-period analysis of annual peak spring break-up and open-water levels for 136 Water Survey of Canada hydrometric stations was used to classify rivers across Canada and to assess the physical controls on peak break-up water-levels. According to the peak water-level river-regime class...
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fttriple:oai:gotriple.eu:3752 2023-05-15T15:11:13+02:00 An Assessment of the river ice break-up season in Canada Von de Wall, Simon Julius Prowse, Terry Donald 2011-12-20 http://hdl.handle.net/1828/3752 en eng 3752 http://hdl.handle.net/1828/3752 UVic’s Research and Learning Repository geo envir Thesis https://vocabularies.coar-repositories.org/resource_types/c_46ec/ 2011 fttriple 2023-01-22T17:01:30Z Graduate A return-period analysis of annual peak spring break-up and open-water levels for 136 Water Survey of Canada hydrometric stations was used to classify rivers across Canada and to assess the physical controls on peak break-up water-levels. According to the peak water-level river-regime classification and subsequent analysis, 32% of rivers were classified as spring break-up dominated, characterized by low elevations and slopes and large basin sizes while 45% were open-water dominated and associated with alpine environments of high elevations and channel slopes, and smaller basin sizes. The remaining 23% of rivers were classified as a mixed regime. A spatial and temporal analysis (1969-2006) of the river ice break-up season using hydrometric variables of timing and water levels, never before assessed at the northern Canada-wide scale, revealed significant declines in break-up water levels and significant trends towards earlier and prolonged break-up in western and central Canada. The spatial and temporal influence of air temperature on break-up timing was assessed using the spring 0°C isotherm, which revealed a significant positive relationship but no spatial patterns. In the case of major ocean/atmosphere oscillations, significant negative (positive) correlations indicate that break-up occurs earlier (later) during the positive phases of the Pacific North American Pattern (El Niño Southern Oscillation) over most of western Canada. Fewer significant positive correlations show that break-up occurs later during the positive phases of the Arctic Oscillation and North Atlantic Oscillation in eastern Canada. Thesis Arctic North Atlantic North Atlantic oscillation Unknown Arctic Canada Pacific |
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Open Polar |
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Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Von de Wall, Simon Julius An Assessment of the river ice break-up season in Canada |
topic_facet |
geo envir |
description |
Graduate A return-period analysis of annual peak spring break-up and open-water levels for 136 Water Survey of Canada hydrometric stations was used to classify rivers across Canada and to assess the physical controls on peak break-up water-levels. According to the peak water-level river-regime classification and subsequent analysis, 32% of rivers were classified as spring break-up dominated, characterized by low elevations and slopes and large basin sizes while 45% were open-water dominated and associated with alpine environments of high elevations and channel slopes, and smaller basin sizes. The remaining 23% of rivers were classified as a mixed regime. A spatial and temporal analysis (1969-2006) of the river ice break-up season using hydrometric variables of timing and water levels, never before assessed at the northern Canada-wide scale, revealed significant declines in break-up water levels and significant trends towards earlier and prolonged break-up in western and central Canada. The spatial and temporal influence of air temperature on break-up timing was assessed using the spring 0°C isotherm, which revealed a significant positive relationship but no spatial patterns. In the case of major ocean/atmosphere oscillations, significant negative (positive) correlations indicate that break-up occurs earlier (later) during the positive phases of the Pacific North American Pattern (El Niño Southern Oscillation) over most of western Canada. Fewer significant positive correlations show that break-up occurs later during the positive phases of the Arctic Oscillation and North Atlantic Oscillation in eastern Canada. |
author2 |
Prowse, Terry Donald |
format |
Thesis |
author |
Von de Wall, Simon Julius |
author_facet |
Von de Wall, Simon Julius |
author_sort |
Von de Wall, Simon Julius |
title |
An Assessment of the river ice break-up season in Canada |
title_short |
An Assessment of the river ice break-up season in Canada |
title_full |
An Assessment of the river ice break-up season in Canada |
title_fullStr |
An Assessment of the river ice break-up season in Canada |
title_full_unstemmed |
An Assessment of the river ice break-up season in Canada |
title_sort |
assessment of the river ice break-up season in canada |
publishDate |
2011 |
url |
http://hdl.handle.net/1828/3752 |
geographic |
Arctic Canada Pacific |
geographic_facet |
Arctic Canada Pacific |
genre |
Arctic North Atlantic North Atlantic oscillation |
genre_facet |
Arctic North Atlantic North Atlantic oscillation |
op_source |
UVic’s Research and Learning Repository |
op_relation |
3752 http://hdl.handle.net/1828/3752 |
_version_ |
1766342103290347520 |