Flow and structure in a dendritic glacier with bedrock steps

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dc.contributor.authorJiskoot, Hester
dc.contributor.authorFox, Thomas A.
dc.contributor.authorVan Wychen, Wesley
dc.date.accessioned2019-11-26T21:01:47Z
dc.date.available2019-11-26T21:01:47Z
dc.date.issued2017
dc.descriptionSherpa Romeo green journal. Open access article. Creative Commons Attribution 4.0 International (CC BY 4.0) appliesen_US
dc.description.abstractWe analyse ice flow and structural glaciology of Shackleton Glacier, a dendritic glacier with multiple ice falls in the Canadian Rockies. A major tributary-trunk junction allows us to investigate the potential of tributaries to alter trunk flow and structure, and the formation of bedrock steps at confluences. Multi-year velocity-stake data and structural glaciology up-glacier from the junction were assimilated with glacier-wide velocity derived from Radarsat-2 speckle tracking. Maximum flow speeds are 65 m a−1 in the trunk and 175 m a−1 in icefalls. Field and remote-sensing velocities are in good agreement, except where velocity gradients are high. Although compression occurs in the trunk up-glacier of the tributary entrance, glacier flux is steady state because flow speed increases at the junction due to the funnelling of trunk ice towards an icefall related to a bedrock step. Drawing on a published erosion model, we relate the heights of the step and the hanging valley to the relative fluxes of the tributary and trunk. It is the first time that an extant glacier is used to test and support such model. Our study elucidates the inherent complexity of tributary/trunk interactions and provides a conceptual model for trunk flow restriction by a tributary in surge-type glaciers.en_US
dc.description.peer-reviewYesen_US
dc.identifier.citationJiskoot, H., Fox, T. A., & Van Wychen, W. (2017). Flow and structure in a dendritic glacier with bedrock steps. Journal of Glaciology, 63(214), 912-928. doi: 10.1017/jog.2017.58en_US
dc.identifier.urihttps://hdl.handle.net/10133/5589
dc.language.isoenen_US
dc.publisherInternational Glaciological Societyen_US
dc.publisher.departmentDepartment of Geographyen_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.publisher.institutionUniversity of Ottawaen_US
dc.publisher.urlhttps://dx.doi.org/10.1017/jog.2017.58
dc.subjectGlacier flowen_US
dc.subjectGlacier erosionen_US
dc.subjectGlacier surgesen_US
dc.subjectMountain glaciersen_US
dc.subjectStructural glaciologyen_US
dc.titleFlow and structure in a dendritic glacier with bedrock stepsen_US
dc.typeArticleen_US
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