DOI: 10.5194/tc-8-651-2014
Scopus记录号: 2-s2.0-84925460576
论文题名: Soil erosion and organic carbon export by wet snow avalanches
作者: Korup O ; , Rixen C
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 651
结束页码: 658
语种: 英语
英文关键词: biogeochemistry
; carbon flux
; cryosphere
; damage
; debris flow
; erosion rate
; organic carbon
; snow avalanche
; snow cover
; soil erosion
; terrain
; Alps
; Davos
; Graubunden
; Switzerland
英文摘要: Many mountain belts sustain prolonged snow cover for parts of the year, although enquiries into rates of erosion in these landscapes have focused almost exclusively on the snow-free periods. This raises the question of whether annual snow cover contributes significantly to modulating rates of erosion in high-relief terrain. In this context, the sudden release of snow avalanches is a frequent and potentially relevant process, judging from the physical damage to subalpine forest ecosystems, and the amount of debris contained in avalanche deposits. To quantitatively constrain this visual impression and to expand the sparse literature, we sampled sediment concentrations of n Combining double low line 28 river-spanning snow-avalanche deposits (snow bridges) in the area around Davos, eastern Swiss Alps, and inferred an orders-of-magnitude variability in specific fine sediment and organic carbon yields (1.8 to 830 t kmg'2 yrg'1, and 0.04 to 131 t C kmg'2 yrg'1, respectively). A Monte Carlo simulation demonstrates that, with a minimum of free parameters, such variability is inherent to the geometric scaling used for computing specific yields. Moreover, the widely applied method of linearly extrapolating plot scale sample data may be prone to substantial under- or overestimates. A comparison of our inferred yields with previously published work demonstrates the relevance of wet snow avalanches as prominent agents of soil erosion and transporters of biogeochemical constituents to mountain rivers. Given that a number of snow bridges persisted below the insulating debris cover well into the summer months, snow-avalanche deposits also contribute to regulating in-channel sediment and organic debris storage on seasonal timescales. Finally, our results underline the potential shortcomings of neglecting erosional processes in the winter and spring months in mountainous terrain subjected to prominent snow cover. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74863
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: Institute of Earth and Environmental Sciences, University of Potsdam, Potsdam, Germany; WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland
Recommended Citation:
Korup O,, Rixen C. Soil erosion and organic carbon export by wet snow avalanches[J]. Cryosphere,2014-01-01,8(2)