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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Reconstruction of a destructive debris-flow event via numerical modeling: the role of valley geometry on flow dynamics
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Reconstruction of a destructive debris-flow event via numerical modeling: the role of valley geometry on flow dynamics

机译：通过数值建模重建破坏性泥石流事件：山谷几何形状对流动动力学的作用

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摘要

Debris-flows are widespread natural phenomena characterized by high mobility (high velocity and long runout distance) and impact forces, which frequently cause human casualties and significant damage to infrastructure. To better understand the dynamics of such events, analyzing in particular the effect induced by the valley geometry on flow velocity, runout and mobilized volumes, in this work we reconstruct a real debris-flow event through numerical modeling. Specifically, we used a modified version of the BING model, a fluid-dynamic depth-integrated numerical model for debris flows, which has been properly modified to account for width changes along the valley. The studied event, which occurred in Scaletta Zanclea (Messina, north-eastern Sicily, Italy) on October 1, 2009, is exceptionally well constrained by field and topographic information. In this respect the flow velocity, estimated from two specific locations on the basis of field evidence, the distribution of erosional and depositional areas along the Racinazzo valley, based on the comparison of pre- and post-event digital elevation models (DEMs), and the runout distance were used as constraints to calibrate the model. Furthermore, we report a detailed description of the main event characteristics based on hydrological records and witness reports. The numerical modeling results are consistent with witness reports and the severe damage recorded in the Scaletta Marina village, and highlight the effect of the valley geometry on both the debris flow velocity and the erosion/deposition processes. The effect of changing valley width has been also quantified, resulting in accelerations of the debris in correspondence of the valley narrowing and stagnations at the plateaus. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：泥石流是一种普遍存在的自然现象，其特征是高机动性（高速度和较长的跳动距离）和冲击力，经常造成人员伤亡并严重破坏基础设施。为了更好地了解此类事件的动力学，尤其是分析谷底几何形状对流速，跳动和动员量的影响，在这项工作中，我们通过数值模型重建了一个真实的泥石流事件。具体来说，我们使用了BING模型的修改版本，该模型是针对泥石流的流体动力学深度综合数值模型，已对其进行了适当修改，以解决沿山谷的宽度变化。这项研究事件于2009年10月1日在Scaletta Zanclea（意大利西西里岛东北部墨西拿）发生，受到田野和地形信息的限制。在这方面，根据现场证据从两个特定位置估算的流速，基于事前和事后数字高程模型（DEM）的比较，沿Racinazzo山谷的侵蚀和沉积区域分布，以及跳动距离被用作校准模型的约束。此外，我们根据水文记录和目击者报告报告了主要事件特征的详细描述。数值模拟结果与见证人的报告以及在Scaletta Marina村庄记录的严重破坏相一致，并突出了山谷几何形状对泥石流速度和侵蚀/沉积过程的影响。山谷宽度变化的影响也已经量化，导致碎片加速，对应于高原上山谷狭窄和停滞。版权所有（c）2015 John Wiley＆Sons，Ltd.

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