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首页> 外文期刊>Natural hazards and earth system sciences >Rockfall monitoring by Terrestrial Laser Scanning - Case study of the basaltic rock face at Castellfollit de la Roca (Catalonia, Spain)
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Rockfall monitoring by Terrestrial Laser Scanning - Case study of the basaltic rock face at Castellfollit de la Roca (Catalonia, Spain)

机译：地面激光扫描监测落石-Castellfollit de la Roca（西班牙加泰罗尼亚）玄武岩面的案例研究

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摘要

This case study deals with a rock face monitoring in urban areas using a Terrestrial Laser Scanner. The pilot study area is an almost vertical, fifty meter high cliff, on top of which the village of Castellfollit de la Roca is located. Rockfall activity is currently causing a retreat of the rock face, which may endanger the houses located at its edge. TLS datasets consist of high density 3-D point clouds acquired from five stations, nine times in a time span of 22 months (from March 2006 to January 2008). The change detection, i.e. rockfalls, was performed through a sequential comparison of datasets. Two types of mass movement were detected in the monitoring period: (a) detachment of single basaltic columns, with magnitudes below 1.5 m3 and (b) detachment of groups of columns, with magnitudes of 1.5 to 150 m3. Furthermore, the historical record revealed (c) the occurrence of slab failures with magnitudes higher than 150 m3. Displacements of a likely slab failure were measured, suggesting an apparent stationary stage. Even failures are clearly episodic, our results, together with the study of the historical record, enabled us to estimate a mean detachment of material from 46 to 91.5 m~3 year~(-1). The application of TLS considerably improved our understanding of rockfall phenomena in the study area.
机译：该案例研究涉及使用地面激光扫描仪在市区进行岩石面监测。试点研究区是一个几乎垂直的，五十米高的悬崖，在其上是Castellfollit de la Roca村。落石活动目前正在使岩壁退缩，这可能危及位于其边缘的房屋。 TLS数据集由从五个站点采集的高密度3-D点云组成，在22个月的时间间隔（从2006年3月到2008年1月）中，采集了9次。通过对数据集进行顺序比较来执行变化检测，即落石。在监视期内，检测到两种类型的质量运动：（a）单个玄武岩柱的分离，其量级低于1.5 m3;（b）几根柱体的分离，其量级为1.5至150 m3。此外，历史记录表明（c）发生了大于150 m3的平板破坏。测量了可能的平板破坏的位移，表明存在明显的静止阶段。甚至故障也很明显是偶发性的，我们的结果以及对历史记录的研究使我们能够估计从46到91.5 m〜3年〜（-1）的平均材料脱离。 TLS的应用极大地提高了我们对研究区域落石现象的理解。

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