Scaling properties of wind and snow depth distribution in an Alpine catchment
Scaling properties of wind and snow depth distribution in an Alpine catchment
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DOI：
10.1029/2010jd014886
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发表时间：
2011-03
影响因子：
--
通讯作者：
R. Mott;M. Schirmer;M. Lehning
中科院分区：
文献类型：
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作者：
R. Mott;M. Schirmer;M. Lehning
[1]积雪的空间变异性是由风引起的雪输送过程驱动的。本研究的主要目的是调查雪深的尺度行为和驱动雪深空间结构的风诱导过程之间的联系。我们使用非常高分辨率的大气和雪传输模拟，比较其空间特征与从机载和地面激光扫描获得的雪深。雪深和风速的最强自相关的方向主要是垂直于模拟的当地流动方向，独立于是否更均匀的背风坡加载在一个地区被认为是在另一个地区形成漂移。在均匀的背风坡加载的情况下，相同的各向异性的方向只被发现在模拟的降水的优先沉积风和雪的分布。这种沉积过程似乎主导均匀背风坡加载。相比之下，跃移驱动的过程似乎占主导地位的漂移和雪沙丘的形成。此外，分形分析表明，类似的尺度突破模拟风速场和测量的雪深定义的上尺度的景观平滑通过雪。
[1] The spatial variability of the snow cover is driven by wind-induced snow transport processes. The main aim of this study is to investigate the link between the scaling behavior of snow depths and the wind-induced processes driving the spatial structure of snow depths. We used very high-resolution atmospheric and snow transport simulations to compare their spatial characteristics with snow depths obtained from airborne and terrestrial laser scans. The directions of the strongest autocorrelations of snow depths and wind velocities were predominantly perpendicular to the modeled local flow direction, independent of whether more homogeneous lee slope loading in one area was considered or the formation of drifts in another area. In the case of homogeneous lee slope loading, the same direction of anisotropy was only found in the modeled preferential deposition of precipitation as for both wind and snow distribution. This deposition process appears to dominate homogeneous lee slope loading. In contrast, saltation-driven processes seem to dominate the formation of drifts and snow dunes. Furthermore, the fractal analysis suggests similar scale breaks for the modeled wind velocity field and measured snow depths defining the upper scale of landscape smoothing through snow.