DOI: 10.5194/tc-14-1449-2020
论文题名: A model for French-press experiments of dry snow compaction
作者: Meyer C.R. ; Keegan K.M. ; Baker I. ; Hawley R.L.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 5 起始页码: 1449
结束页码: 1458
语种: 英语
英文关键词: compaction
; compression
; glacier
; meltwater
; overburden
; permeability
; rheology
; sea level change
英文摘要: Snow densification stores water in alpine regions and transforms snow into ice on the surface of glaciers. Despite its importance in determining snow-water equivalent and glacier-induced sea level rise, we still lack a complete understanding of the physical mechanisms underlying snow compaction. In essence, compaction is a rheological process, where the rheology evolves with depth due to variation in temperature, pressure, humidity, and meltwater. The rheology of snow compaction can be determined in a few ways, for example, through empirical investigations (e.g., Herron and Langway, 1980), by microstructural considerations (e.g., Alley, 1987), or by measuring the rheology directly, which is the approach we take here. Using a French-press or cafetière-à-piston compression stage, Wang and Baker (2013) compressed numerous snow samples of different densities. Here we derive a mixture theory for compaction and airflow through the porous snow to compare against these experimental data. We find that a plastic compaction law explains experimental results. Taking standard forms for the permeability and effective pressure as functions of the porosity, we show that this compaction mode persists for a range of densities and overburden loads. These findings suggest that measuring compaction in the lab is a promising direction for determining the rheology of snow through its many stages of densification. © 2020 American Medical Association. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164536
Appears in Collections: 气候变化与战略
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作者单位: Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, United States; Department of Geological Sciences and Engineering, University of Nevada, Reno, NV 89557, United States; Department of Earth Science, Dartmouth College, Hanover, NH 03755, United States
Recommended Citation:
Meyer C.R.,Keegan K.M.,Baker I.,et al. A model for French-press experiments of dry snow compaction[J]. Cryosphere,2020-01-01,14(5)