Using wind fields from a high-resolution atmospheric model for simulating snow dynamics in mountainous terrain
Using wind fields from a high-resolution atmospheric model for simulating snow dynamics in mountainous terrain
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DOI：
10.1002/hyp.7208
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发表时间：
2009-03-30
影响因子：
3.2
通讯作者：
Mauser, W.
中科院分区：
文献类型：
--
作者：
Bernhardt, M.;Zaengl, G.;Mauser, W.
风雪输送对积雪的空间变异性和融雪径流的时间动态有显著影响。对于精确的积雪模拟，有效的大气强迫场是必不可少的。因为不可能通过简单的站数据空间内插来产生合适的风场。开发了一种新的方法：使用宾夕法尼亚州立大学-国家大气研究中心(MM5)模式的修改版本来生成200米分辨率的风场。由于MM5的计算成本很高，将风场产生作为雪盖模拟的一个业务部分是不可行的。因此，在模拟积雪输送过程之前，生成了一个由220个风场组成的档案。这些区域代表了发生在我们试验场的风雪输送的最相关的天气形势。生成特定积雪模式时间步中使用的风场的标准是根据德国气象局/Deutscher Wetterdienst(DWD)Lokalmodell(LM)分析数据得出的700百帕水平上的平均风速和风向。风场库提供了物理导出的风速和风向场，用于在德国贝希特斯加登国家公园的高阿尔卑斯山地区驱动积雪运输模型(SnowTran-3D)。在复杂的阿尔卑斯山地形中，该程序提供了简单内插方法的替代方法，以合理的计算成本产生了更好的物理真实感。版权所有(C)2008 John Wiley&Sons，Ltd.
Wind-induced snow transport has remarkable effects on the snow cover spatial variability and on the temporal dynamics of snowmelt runoff. For accurate snow cover modelling, valid atmospheric forcing fields are essential. Since it is impossible to generate appropriate wind fields by a simple spatial interpolation of station data. a new approach was developed: A modified version of the Penn State University-National Centre for Atmospheric Research (MM5) model was used to generate wind fields with 200-m resolution. Because of the high computational costs of MM5, it was not practicable to include the wind field generation as an operational part of the snow cover modelling. Therefore, an archive consisting of 220 wind fields was generated prior to the simulation of the snow transport processes. These fields represent the most relevant synoptic situations for wind-induced snow transport occurring at our test site. The criteria to generate which wind field to use in a specific snow model time step are mean wind speed and direction at the 700 hPa level derived from German Weather Service/Deutscher Wetterdienst (DWD) Lokalmodell (LM) analysis data. The wind field library provided physically derived wind speed and direction fields that were used to drive a snow transport model (SnowTran-3D) in a high Alpine area in the Berchtesgaden National Park, Germany. In complex Alpine terrain, the procedure provides an alternative to simple interpolation methods, yielding improved physical realism at reasonable computational expense. Copyright (C) 2008 John Wiley & Sons, Ltd.