Files in this item
Roughness of a subglacial conduit under Hansbreen, Svalbard
Item metadata
dc.contributor.author | Mankoff, Kenneth D. | |
dc.contributor.author | Gulley, Jason D. | |
dc.contributor.author | Tulaczyk, Slawek M. | |
dc.contributor.author | Covington, Matthew D. | |
dc.contributor.author | Liu, Xiaofeng | |
dc.contributor.author | Chen, Yunxiang | |
dc.contributor.author | Benn, Douglas I. | |
dc.contributor.author | GŁowacki, Piotr S. | |
dc.date.accessioned | 2017-06-07T14:30:09Z | |
dc.date.available | 2017-06-07T14:30:09Z | |
dc.date.issued | 2017-06 | |
dc.identifier | 250199256 | |
dc.identifier | 90c333fa-3c42-4c60-9952-8889b48a12b0 | |
dc.identifier | 85019544529 | |
dc.identifier | 000401649100003 | |
dc.identifier.citation | Mankoff , K D , Gulley , J D , Tulaczyk , S M , Covington , M D , Liu , X , Chen , Y , Benn , D I & GŁowacki , P S 2017 , ' Roughness of a subglacial conduit under Hansbreen, Svalbard ' , Journal of Glaciology , vol. 63 , no. 239 , pp. 423-435 . https://doi.org/10.1017/jog.2016.134 | en |
dc.identifier.issn | 0022-1430 | |
dc.identifier.other | ORCID: /0000-0002-3604-0886/work/64697406 | |
dc.identifier.uri | https://hdl.handle.net/10023/10934 | |
dc.description | K.M., J.G., X.L. and Y.C. were supported by the National Science Foundation (NSF) under Grant No. #1503928. Thefieldwork team (K.M., J.G., M.C.) were supported by the Norwegian Arctic Research Council and Svalbard Science Forum, RiS #6106. K.M. was also supported by the National Aeronautics and Space Administration (NASA)Headquarters under the NASA Earth and Space Science Fellowship Program – Grant NNX10AN83H, the University of California, Santa Cruz, and the Woods Hole Oceanographic Institution Ocean and Climate Change Institute post-graduate fellowship. Portions of this work were conducted while J.G. was supported by the NSF EAR Postdoctoral Fellowship (#0946767). S.T. was funded by NASA grant NNX11AH61G. | en |
dc.description.abstract | Hydraulic roughness exerts an important but poorly understood control on water pressure in subglacial conduits. Where relative roughness values are <5%, hydraulic roughness can be related to relative roughness using empirically-derived equations such as the Colebrook-White equation. General relationships between hydraulic roughness and relative roughness do not exist for relative roughness >5%. Here we report the first quantitative assessment of roughness heights and hydraulic diameters in a subglacial conduit. We measured roughness heights in a 125 m long section of a subglacial conduit using structure-from-motion to produce a digital surface model, and hand-measurements of the b-axis of rocks. We found roughness heights from 0.07 to 0.22 m and cross-sectional areas of 1-2 m2, resulting in relative roughness of 3-12% and >5% for most locations. A simple geometric model of varying conduit diameter shows that when the conduit is small relative roughness is >30% and has large variability. Our results suggest that parameterizations of conduit hydraulic roughness in subglacial hydrological models will remain challenging until hydraulic diameters exceed roughness heights by a factor of 20, or the conduit radius is >1 m for the roughness elements observed here. | |
dc.format.extent | 13 | |
dc.format.extent | 752496 | |
dc.language.iso | eng | |
dc.relation.ispartof | Journal of Glaciology | en |
dc.subject | Glacier hydrology | en |
dc.subject | Roughness | en |
dc.subject | Subglacial conduits | en |
dc.subject | G Geography (General) | en |
dc.subject | GB Physical geography | en |
dc.subject | Earth-Surface Processes | en |
dc.subject | DAS | en |
dc.subject.lcc | G1 | en |
dc.subject.lcc | GB | en |
dc.title | Roughness of a subglacial conduit under Hansbreen, Svalbard | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Geography and Geosciences | en |
dc.contributor.institution | University of St Andrews. Geography & Sustainable Development | en |
dc.contributor.institution | University of St Andrews. Bell-Edwards Geographic Data Institute | en |
dc.identifier.doi | https://doi.org/10.1017/jog.2016.134 | |
dc.description.status | Peer reviewed | en |
This item appears in the following Collection(s)
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.