DOI: 10.5194/tc-9-1819-2015
Scopus记录号: 2-s2.0-84941917231
论文题名: Thermal energy in dry snow avalanches
作者: Steinkogler W ; , Sovilla B ; , Lehning M
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 5 起始页码: 1819
结束页码: 1830
语种: 英语
英文关键词: data set
; elevation
; friction
; future prospect
; glacial erosion
; heat balance
; infrared imagery
; infrared radiation
; mass balance
; snow avalanche
; snow cover
; spatial resolution
; temperature effect
; thermal conductivity
; thermal power
英文摘要: Avalanches can exhibit many different flow regimes from powder clouds to slush flows. Flow regimes are largely controlled by the properties of the snow released and entrained along the path. Recent investigations showed the temperature of the moving snow to be one of the most important factors controlling the mobility of the flow. The temperature of an avalanche is determined by the temperature of the released and entrained snow but also increases by frictional processes with time. For three artificially released avalanches, we conducted snow profiles along the avalanche track and in the deposition area, which allowed quantifying the temperature of the eroded snow layers. This data set allowed to calculate the thermal balance, from release to deposition, and to discuss the magnitudes of different sources of thermal energy of the avalanches. For the investigated dry avalanches, the thermal energy increase due to friction was mainly depending on the effective elevation drop of the mass of the avalanche with a warming of approximately 0.3 °C per 100 vertical metres. Contrarily, the temperature change due to entrainment varied for the individual avalanches, from -0.08 to 0.3 °C, and depended on the temperature of the snow along the path and the erosion depth. Infrared radiation thermography (IRT) was used to assess the surface temperature before, during and just after the avalanche with high spatial resolution. This data set allowed to identify the warmest temperatures to be located in the deposits of the dense core. Future research directions, especially for the application of IRT, in the field of thermal investigations in avalanche dynamics are discussed. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75246
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: WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland; CRYOS, School of Architecture, Civil and Environmental Engineering, EPFL, Lausanne, Switzerland
Recommended Citation:
Steinkogler W,, Sovilla B,, Lehning M. Thermal energy in dry snow avalanches[J]. Cryosphere,2015-01-01,9(5)