Flow of dense avalanches past obstructions
Flow of dense avalanches past obstructions
复制标题
DOI：
10.3189/172756401781819166
复制
发表时间：
2001
影响因子：
2.9
通讯作者：
Y. Tai;J. Gray;K. Hutter;S. Noelle
中科院分区：
文献类型：
--
作者：
Y. Tai;J. Gray;K. Hutter;S. Noelle
防止地区遭受雪崩袭击的一种方法是通过直墙或弧形墙或四面体或圆柱形结构来分流。因此，出现了一个问题，即给定的雪崩流量如何相对于分流深度和流向发生变化。本文报道了重力驱动的稠密颗粒流沿平面和四面体楔体阻挡的斜面上的室内实验结果。据指出，这些流动伴随着障碍的存在而引起的冲击。这导致了颗粒雪崩从超临界流到亚临界流的转变，与深度和速度的变化有关。结果表明，在Savage-Hutter理论中采用合适的激波捕获积分技术，可以很好地描述有限质量颗粒流从斜面滑移到水平跳动区的激波形成过程，以及四面体防护结构两侧颗粒流的激波形成过程。
Abstract One means of preventing areas from being hit by avalanches is to divert the flow by straight or curved walls or tetrahedral or cylindrical-type structures. Thus, there arises the question how a given avalanche flow is changed regarding the diverted-flow depth and flow direction. In this paper a report is given on laboratory experiments performed for gravity-driven dense granular flows down an inclined plane obstructed by plane wall and tetrahedral wedge. It was observed that these flows are accompanied by shocks induced by the presence of the obstacles. These give rise to a transition from super-to subcritical flow of the granular avalanche, associated with depth and velocity changes. It is demonstrated that with an appropriate shock-capturing integration technique for the Savage-Hutter theory, the shock formation for a finite-mass granular flow sliding from an inclined plane into a horizontal run-out zone is well described, as is the shock formation of the granular flow on either side of a tetrahedral protection structure.