The Art of Landslides: How Stochastic Mass Wasting Shapes Topography and Influences Landscape Dynamics
The Art of Landslides: How Stochastic Mass Wasting Shapes Topography and Influences Landscape Dynamics
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滑坡的艺术：随机质量损耗如何塑造地形并影响景观动力学
DOI：
10.1029/2022jf006745
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发表时间：
2022-08-01
影响因子：
3.9
通讯作者：
Tucker, Gregory E.
中科院分区：
文献类型：
--
作者：
Campforts, Benjamin;Shobe, Charles M.;Tucker, Gregory E.
基岩滑坡塑造了地形，并调动了大量的沉积物。然而，滑坡产生的沉积物和河流系统，共同管理大规模的景观演变之间的相互作用还没有得到很好的理解。为了解释在陡峭，滑坡易发地形观察到的形态模式，我们明确随机滑坡和相关的沉积动力学模型。该模型考虑了几个常见的景观特征，如斜坡频率分布，其中包括超过区域稳定性限制的值，准平面的山坡装饰直，紧密间隔的通道状功能，沉积物在山谷网络，而不是在山坡上的积累。随机滑坡强烈地影响到河流系统的沉积物供应的大小和时间。我们发现，间歇性的沉积物供应最终反映在地形。在动态平衡，滑坡衍生的沉积物脉冲产生持续的景观动力学，通过形成和破坏的滑坡坝和后生峡谷的滑坡力转移通道的位置。我们的工作突出了滑坡和沉积物动力学之间的相互作用的重要性，最终控制对环境变化的大规模响应。
Bedrock landslides shape topography and mobilize large volumes of sediment. Yet, interactions between landslide-produced sediment and fluvial systems that together govern large-scale landscape evolution are not well understood. To explain morphological patterns observed in steep, landslide-prone terrain, we explicitly model stochastic landsliding and associated sediment dynamics. The model accounts for several common landscape features such as slope frequency distributions, which include values in excess of regional stability limits, quasi-planar hillslopes decorated with straight, closely spaced channel-like features, and accumulation of sediment in valley networks rather than on hillslopes. Stochastic landsliding strongly affects the magnitude and timing of sediment supply to the fluvial system. We show that intermittent sediment supply is ultimately reflected in topography. At dynamic equilibrium, landslide-derived sediment pulses generate persistent landscape dynamism through the formation and breaching of landslide dams and epigenetic gorges as landslides force shifts in channel positions. Our work highlights the importance of interactions between landslides and sediment dynamics that ultimately control landscape-scale response to environmental change.