DOI: 10.5194/tc-8-537-2014
Scopus记录号: 2-s2.0-84924569339
论文题名: Near-surface permeability in a supraglacial drainage basin on the Llewellyn Glacier, Juneau Icefield, British Columbia
作者: Karlstrom L ; , Zok A ; , Manga M
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 537
结束页码: 546
语种: 英语
英文关键词: diurnal variation
; drainage basin
; glacial hydrology
; ice field
; permeability
; porosity
; snowpack
; surface water
; water flow
; Alaska
; British Columbia
; Canada
; Juneau
; Llewellyn Glacier
; United States
英文摘要: Supraglacial channel networks link time varying melt production and meltwater routing on temperate glaciers. Such channel networks often include components of both surface transport in streams and subsurface porous flow through near-surface ice, firn or snowpack. Although subsurface transport if present will likely control network transport efficacy, it is the most poorly characterized component of the system.We present measurements of supraglacial channel spacing and network properties on the Juneau Icefield, subsurface water table height, and time variation of hydraulic characteristics including diurnal variability in water temperature. We combine these data with modeling of porous flow in weathered ice to infer near-surface permeability. Estimates are based on an observed phase lag between diurnal water temperature variations and discharge, and independently on measurement of water table surface elevation away from a stream. Both methods predict ice permeability on a 1-10m scale in the range of 10-10 -10-11 m2. These estimates are considerably smaller than common parameterizations of surface water flow on bare ice in the literature, as well as smaller than most estimates of snow-pack permeability. For supraglacial environments in which porosity/permeability creation in the subsurface is balanced by porous flow of meltwater, our methods provide an estimate of microscale hydraulic properties from observations of supraglacial channel spacing. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74872
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Geophysics, Stanford University, 397 Panama Mall, Stanford, CA, United States; Department of Earth and Planetary Science, 307 McCone Hall, University of California at Berkeley, Berkeley, CA, United States
Recommended Citation:
Karlstrom L,, Zok A,, Manga M. Near-surface permeability in a supraglacial drainage basin on the Llewellyn Glacier, Juneau Icefield, British Columbia[J]. Cryosphere,2014-01-01,8(2)