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Characteristic landslide distributions: An investigation of landscape controls on landslide size
Earth and Planetary Science Letters ( IF 5.3 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.epsl.2020.116203
William G. Medwedeff , Marin K. Clark , Dimitrios Zekkos , A. Joshua West

Abstract Estimation of landslide erosion rates and hazard prediction require a firm understanding of the physical controls on landslide size. In this study we seek to understand how the characteristics of different landscapes and forcing events influence the distribution of landslide size at a regional scale. We explore the parameter space of a mechanically-based landslide model through a series of simulations using digital elevation data. Consistent with previous studies, we find that large slope failures are infrequent due to the scarcity of large, steep hillslopes in typical mountainous topography. On the other hand, we find that the occurrence of small landslides is limited by the cohesive strength of hillslope material, which overcomes the weaker driving forces on short slopes. We test our model results with an empirical investigation of frequency-size distributions for eight real co-seismic landslide inventories. Although empirical data are noisy, we find a positive correlation between landslide size and hillslope relief, while the effects of PGA on landslide size are less pronounced. We conclude that landslide size distributions reflect the available distribution of hillslope geometries in a given landscape, and that external forcing (e.g., seismic ground motion) determines which subset of the hillslope distribution fails during a particular event. For a given landscape and forcing event, there is a particular length-scale over which landsliding is statistically favored, leading to the concept of characteristic landslide size distributions.

中文翻译:

特征滑坡分布:对滑坡大小的景观控制调查

摘要 滑坡侵蚀率的估计和灾害预测需要对滑坡大小的物理控制有深入的了解。在这项研究中,我们试图了解不同景观的特征和强迫事件如何影响区域尺度的滑坡大小分布。我们通过一系列使用数字高程数据的模拟来探索基于机械的滑坡模型的参数空间。与之前的研究一致,我们发现由于典型山区地形中大而陡峭的山坡稀缺,大坡度破坏并不常见。另一方面,我们发现小山体滑坡的发生受到山坡材料内聚力的限制,克服了短坡上较弱的驱动力。我们通过对八个真实的同震滑坡清单的频率大小分布的实证调查来测试我们的模型结果。尽管经验数据是嘈杂的,但我们发现滑坡大小与山坡地势之间存在正相关关系,而 PGA 对滑坡大小的影响则不那么明显。我们得出结论,滑坡尺寸分布反映了给定景观中山坡几何形状的可用分布,并且外力(例如地震地面运动)决定了山坡分布的哪个子集在特定事件期间失败。对于给定的景观和强迫事件,在统计上有利于滑坡的特定长度尺度,导致特征滑坡尺寸分布的概念。尽管经验数据是嘈杂的,但我们发现滑坡大小与山坡地势之间存在正相关关系,而 PGA 对滑坡大小的影响则不那么明显。我们得出结论,滑坡尺寸分布反映了给定景观中山坡几何形状的可用分布,并且外力(例如地震地面运动)决定了山坡分布的哪个子集在特定事件期间失败。对于给定的景观和强迫事件,在统计上有利于滑坡的特定长度尺度,导致特征滑坡尺寸分布的概念。尽管经验数据是嘈杂的,但我们发现滑坡大小与山坡地势之间存在正相关关系,而 PGA 对滑坡大小的影响则不那么明显。我们得出结论,滑坡尺寸分布反映了给定景观中山坡几何形状的可用分布,并且外力(例如地震地面运动)决定了山坡分布的哪个子集在特定事件期间失败。对于给定的景观和强迫事件,在统计上有利于滑坡的特定长度尺度,导致特征滑坡尺寸分布的概念。我们得出结论,滑坡尺寸分布反映了给定景观中山坡几何形状的可用分布,并且外力(例如地震地面运动)决定了山坡分布的哪个子集在特定事件期间失败。对于给定的景观和强迫事件,在统计上有利于滑坡的特定长度尺度,导致特征滑坡尺寸分布的概念。我们得出结论,滑坡尺寸分布反映了给定景观中山坡几何形状的可用分布,并且外力(例如地震地面运动)决定了山坡分布的哪个子集在特定事件期间失败。对于给定的景观和强迫事件,在统计上有利于滑坡的特定长度尺度,导致特征滑坡尺寸分布的概念。
更新日期:2020-06-01
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