Observations and modelling of snow avalanche entrainment
Observations and modelling of snow avalanche entrainment
复制标题
雪崩夹带的观测和建模
DOI：
10.5194/nhess-2-169-2002
复制
发表时间：
2002
影响因子：
4.6
通讯作者：
P. Bartelt
中科院分区：
文献类型：
--
作者：
B. Sovilla;P. Bartelt
抽象。在本文中，全尺寸雪崩动力学测量从意大利Pizzac和瑞士Vallee de la Sionne试验场被用来开发一个积雪夹带模型。三个雪崩事件的详细分析表明，积雪夹带在雪崩前似乎占主导地位的基础滑动面的床侵蚀。此外，雪崩体内的质量分布主要是基底摩擦的函数。我们表明，雪崩中的质量分布显着改变流动动力学。两种不同的动力学模型，瑞士的Voellmy流体模型和挪威的NIS模型，被用来反算的事件。各种夹带的方法进行了研究和比较的测量。我们证明，挪威NIS模型显然是更好地模拟的事件，一旦雪夹带已包括在模拟中。
Abstract. In this paper full scale avalanche dynamics measurements from the Italian Pizzac and Swiss Vallee de la Sionne test sites are used to develop a snowcover entrainment model. A detailed analysis of three avalanche events shows that snowcover entrainment at the avalanche front appears to dominate over bed erosion at the basal sliding surface. Furthermore, the distribution of mass within the avalanche body is primarily a function of basal friction. We show that the mass distribution in the avalanche changes the flow dynamics significantly. Two different dynamical models, the Swiss Voellmy-fluid model and the Norwegian NIS model, are used to back calculate the events. Various entrainment methods are investigated and compared to measurements. We demon-strate that the Norwegian NIS model is clearly better able to simulate the events once snow entrainment has been included in the simulations.