Variation of deposition depth with slope angle in snow avalanches: Measurements from Vallée de la Sionne
Variation of deposition depth with slope angle in snow avalanches: Measurements from Vallée de la Sionne
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雪崩中沉积深度随坡度的变化：Vallée de la Sionne 的测量
DOI：
10.1029/2009jf001390
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Sovilla B
中科院分区：
文献类型：
--
作者：
Sovilla B
2005-2006 年冬季，Vallée de la Sionne 两次干混合雪崩通过前后，使用激光扫描仪精确测量了雪面高度。测量结果用于计算沿每条完整雪崩路径的积雪深度，高度分辨率为 100 毫米，水平分辨率为 500 毫米。这些数据比以前对大型雪崩的任何测量都要准确得多，并且表明沉积深度与坡度呈强烈负相关。也就是说，在陡坡上沉积物较浅，而在缓坡上沉积物较深。还使用调频连续波雷达在一个位置观察了雪深的时间演变，显示了雪崩经过时的初始侵蚀和最终沉积。附近位置的测量给出了流速分布，并表明雪崩尾部由持续约 100 秒的稳态亚临界流组成。最终，随着深度的稍微减小，尾巴慢慢减速，然后停止。我们表明，倾斜角度和沉积深度之间的依赖性可以通过内聚摩擦模型和 Pouliquenhstop 模型来解释。
The snow surface height was precisely measured, with a laser scanner, before and after the passage of two dry‐mixed avalanches in Vallée de la Sionne during the winter of 2005–2006. The measurements were used to calculate the depth of the deposited snow along each entire avalanche path with a height resolution of 100 mm and a horizontal resolution of 500 mm. These data are much more accurate than any previous measurements from large avalanches and show that the deposit depth is strongly negatively correlated with the slope angle. That is, on steep slopes the deposit is shallow, and on gentle slopes the deposit is deep. The time evolution of the snow depth, showing the initial erosion and final deposition as the avalanche passed, was also observed at one position using a frequency‐modulated continuous wave radar. Measurements at a nearby position gave flow speed profiles and showed that the avalanche tail consists of a steady state subcritical flow that lasts for about 100 s. Eventually, the tail slowly decelerates as the depth slightly decreases, and then it comes to rest. We show that the dependency between the slope angle and the deposition depth can be explained by both a cohesive friction model and the Pouliquenhstopmodel.
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影响因子：
4.1
作者：
Kern, MA;Tiefenbacher, F;McElwaine, JN
通讯作者：
McElwaine, JN
影响因子：
4.1
作者：
Ammann, WJ
通讯作者：
Ammann, WJ
瑞士 Vallée de la Sionne 的摄影测量雪崩体积测量
影响因子：
2.9
作者：
J. Vallet;U. Gruber;F. Dufour
通讯作者：
F. Dufour
脉冲多普勒雷达、连续波雷达和光学方法测量雪崩速度的比较
影响因子：
4.1
作者：
L. Rammer;M. Kern;U. Gruber;F. Tiefenbacher
通讯作者：
F. Tiefenbacher
影响因子：
2.9
作者：
D. Issler
通讯作者：
D. Issler