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A reinterpretation of the Downie Slide (British Columbia, Canada) based on slope damage characterization and subsurface data interpretation
Landslides ( IF 6.7 ) Pub Date : 2021-01-15 , DOI: 10.1007/s10346-020-01601-5
Davide Donati , Allison M. Westin , Doug Stead , John J. Clague , Thomas W. Stewart , Martin S. Lawrence , Julia Marsh

The displacement of a large slow-moving landslide is accompanied by slope damage, such as fractures, tension cracks, and slope bulging. Studies of these features provide insight into the mechanisms responsible for the deformation. In this paper, we investigate slope damage at the Downie Slide, a very large landslide in British Columbia, Canada, that is slowly moving along two shear zones subparallel to the ground surface. Structural geology, and particularly the morphology of the lower shear zone, strongly controls the deformation and, in turn, the observed internal and surficial slope damage features. We use aerial and underground adit laser scanning and photogrammetry to characterize the geometry of the landslide. We subdivide the slide area into slope damage domains based on the distribution, size, and orientation of the slope damage features. We reconstruct the shape of the two failure surfaces by interpolating borehole inclinometer monitoring data and processing the 3D surfaces in a GIS environment to create aspect and slope maps. We observe a strong correlation between surficial slope damage features and changes in the dip and dip direction of the lower sliding surface. We further infer the presence of a multi-planar failure surface geometry and previously unrecognized structurally controlled damage zones.

中文翻译:

基于斜坡损伤特征和地下数据解释的 Downie Slide(加拿大不列颠哥伦比亚省)的重新解释

大型慢速滑坡的位移伴随着边坡的破坏,如裂缝、拉裂、边坡鼓胀等。对这些特征的研究提供了对导致变形的机制的深入了解。在本文中,我们调查了加拿大不列颠哥伦比亚省的一个非常大的滑坡 Downie Slide 的斜坡损坏,该滑坡沿两个平行于地表的剪切带缓慢移动。构造地质,特别是下剪切带的形态,强烈控制变形,进而控制观察到的内部和表面边坡损伤特征。我们使用空中和地下隧道激光扫描和摄影测量来表征滑坡的几何形状。我们根据斜坡损坏特征的分布、大小和方向将滑动区域细分为斜坡损坏域。我们通过插入钻孔测斜仪监测数据并在 GIS 环境中处理 3D 表面以创建坡向图和坡度图来重建两个破坏面的形状。我们观察到地表斜坡损伤特征与下滑动面倾角和倾角方向的变化之间存在很强的相关性。我们进一步推断存在多平面破坏表面几何形状和以前无法识别的结构控制损坏区域。
更新日期:2021-01-15
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