2D Runout Modelling of Hillslope Debris Flows, Based on Well-Documented Events in Switzerland
2D Runout Modelling of Hillslope Debris Flows, Based on Well-Documented Events in Switzerland
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基于瑞士有据可查的事件的山坡泥石流二维跳动建模
DOI：
10.3390/geosciences10020070
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发表时间：
2020
期刊：
影响因子：
2.7
通讯作者：
C. Scheidl
中科院分区：
文献类型：
--
作者：
Florian Zimmermann;B. McArdell;C. Rickli;C. Scheidl
在山区，山坡泥石流等大规模流动对人和基础设施构成严重威胁，尽管其规模和流出距离往往小于泥石流或泥石流等沟内过程。坡面泥石流事件是一种特殊的过程，一般在陡坡上都能观测到。因此，划定濒危地区和实施保护措施是风险分析框架内的一项重要手段，特别是在高山地区人口稠密地区。在这里，二维跳动预测方法是估计可能的行程长度和受影响区域的有用工具。然而，没有多少研究集中在二维径流估计专门用于山坡泥石流过程。根据数据从19个有据可查的山坡泥石流事件在瑞士，我们进行了系统的评估与软件快速质量运动模拟：泥石流（RAMMS DF）-一个程序最初开发的泥石流和雪崩的径流估计进行的径流模拟。RAMMS提供了使用传统的Voellmy型剪切应力方法来描述流动阻力以及考虑内聚相互作用的可能性，因为它发生在具有低剪切速率的致密流的核心中，就像我们也期望山坡泥石流过程一样。我们的研究结果表明，反算的干库仑摩擦参数和粘土含量的可动土壤的百分比之间的相关性。考虑到内聚相互作用，所有模拟的性能得到改善，减少高估的观察到的沉积面积。然而，研究结果也表明，该参数，占粘性相互作用，既不能与土壤的物理性质，也不能不同的饱和条件。
In mountain areas, mass movements, such as hillslope debris flows, pose a serious threat to people and infrastructure, although size and runout distances are often smaller than those of debris avalanches or in-channel-based processes like debris floods or debris flows. Hillslope debris-flow events can be regarded as a unique process that generally can be observed at steep slopes. The delimitation of endangered areas and the implementation of protective measures are therefore an important instrument within the framework of a risk analysis, especially in the densely populated area of the alpine region. Here, two-dimensional runout prediction methods are helpful tools in estimating possible travel lengths and affected areas. However, not many studies focus on 2D runout estimations specifically for hillslope debris-flow processes. Based on data from 19 well-documented hillslope debris-flow events in Switzerland, we performed a systematic evaluation of runout simulations conducted with the software Rapid Mass Movement Simulation: Debris Flow (RAMMS DF)—a program originally developed for runout estimation of debris flows and snow avalanches. RAMMS offers the possibility to use a conventional Voellmy-type shear stress approach to describe the flow resistance as well as to consider cohesive interaction as it occurs in the core of dense flows with low shear rates, like we also expect for hillslope debris-flow processes. The results of our study show a correlation between the back-calculated dry Coulomb friction parameters and the percentage of clay content of the mobilised soils. Considering cohesive interaction, the performance of all simulations was improved in terms of reducing the overestimation of the observed deposition areas. However, the results also indicate that the parameter which accounts for cohesive interaction can neither be related to soil physical properties nor to different saturation conditions.
影响因子：
5.1
作者：
M. Mergili;J. Fischer;Julia Krenn;S. Pudasaini
通讯作者：
M. Mergili;J. Fischer;Julia Krenn;S. Pudasaini