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dc.contributor.authorBeel, Caseyen
dc.description.abstractRecent climate warming and changing precipitation patterns have both thermally and physically disturbed permafrost watersheds across much of the Arctic, increasing the mobility of dissolved and particulate material from terrestrial to aquatic environments. The overarching objective of this research was to determine the spatial and temporal scale of the impact permafrost disturbances, both thermal and physical, have on all of the major components of fluvial material fluxes. This research significantly expanded on long-term field observations (2003- 2017) at the Cape Bounty Arctic Watershed Observatory (CBAWO) in the Canadian High Arctic (~75 ºN). Thermal disturbance (deep active layer thaw) significantly alters the export of dissolved ions at all spatial scales observed and fluxes remain elevated after a decade of observation, post-disturbance. Localized physical disturbances (active layer detachments: ALDs) were shown to change fluvial systems from dissolved to particulate dominated export in small, headwater-slope streams. Particulate fluxes respond immediately to and recover rapidly from localized ALDs, but remain elevated ten-years post physical-disturbance. Despite increased particulate erosion from small, headwater-slope streams, localized ALDs have not increased the downstream, watershed-scale flux of particulate material beyond an immediate, short-lived pulse at the outlet of both watersheds. This indicates that the impact of localized ALDs on particulate material fluxes does not spatially scale-up to the larger watersheds at the CBAWO, which is largely explained by: (1) the propensity toward net in-channel and extra-channel sediment storage along the main drainage network, (2) changing hydrometeorological conditions, and (3) limited contemporary fluvial energy to mobilize additional sediment in this setting. This research has substantially advanced our understanding of how different types of permafrost disturbance alter the composition and magnitudes of fluvial fluxes in discernible ways that improve our understanding of changes to circum-Arctic environments. This thesis provides essential constraints on the temporal persistence of the impact of differing permafrost disturbances on fluvial systems. Results from this thesis will help inform coupled climate-terrestrial models and will help to spatially-scale the impact of permafrost changes on fluvial systems across the circum-Arctic.en
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.rightsCC0 1.0 Universalen
dc.subjectHigh Arcticen
dc.subjectWater Qualityen
dc.subjectPermafrost Disturbanceen
dc.titleEvolving High Arctic Landscapes: A Fluvial Geomorphic Perspectiveen
dc.contributor.supervisorLamoureux, Scotten
dc.contributor.supervisorOrwin, Johnen
dc.contributor.departmentGeography and Planningen
dc.embargo.termsWe would like to request a restriction on my thesis for a maximum of one-year to allow for peer-reviewed publication on the remaining manuscripts. The data presented in this thesis, and the findings of this thesis, are unique to this field of research. This short restriction will also allow time for us to get the data put into data repositories for public use.en
dc.embargo.liftdate2024-09-05T17:02:57Z's University at Kingstonen

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Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
Except where otherwise noted, this item's license is described as Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada