华盛顿冰川阶地西北部河流曲流与滑坡之间的动态反馈

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
S. M. Ahrendt, B. B. Mirus, S. R. LaHusen, J. P. Perkins
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引用次数: 0

摘要

河谷的山体滑坡具有独特的级联灾害风险,可能破坏基础设施并造成死亡。在冰期后的山谷中,许多滑坡被认为与侧向河流侵蚀有关,但河流-山坡相互作用的动力学尚未得到很好的理解。在这里,我们调查了华盛顿州西部的一段努克萨克河,河道两侧是易发生山体滑坡的冰川阶地,类似于2014年530号州际公路“Oso”滑坡中失败的冰川阶地。我们通过17个航空图像数据集(1933-2022)绘制了216个滑坡的时间图,并分析了它们与河流曲流和曲率的关系。我们观察了横向河流曲流与相邻山谷滑坡之间的动态反馈。由于河流侵蚀和边坡破坏的共同作用,在河流曲率峰值(>0.0075 1/m)下游的固定外曲流弯曲处,阶地的侧向退缩率高达25米/年;这些地方容易发生浅层和深层滑坡。延伸至活动河谷宽度17%-32%的深层滑坡可使河流远离泛滥平原边缘,改变河道平面。取代河流的山体滑坡改变了上游或下游的曲流,从而影响了随后山体滑坡的位置。这个耦合的概念模型的滑坡驱动的曲流位移和山谷相邻的滑坡是跨西华盛顿河系统的例子。上下游相邻山谷滑坡之间的距离与山谷宽度、曲流波长和阶地高度有关。我们的研究结果可以促进我们对景观演变中河流-山坡界面的理解,并可用于河流廊道的灾害管理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dynamic Feedbacks Between River Meandering and Landsliding in Northwestern Washington Glacial Terraces

Dynamic Feedbacks Between River Meandering and Landsliding in Northwestern Washington Glacial Terraces

Dynamic Feedbacks Between River Meandering and Landsliding in Northwestern Washington Glacial Terraces

Dynamic Feedbacks Between River Meandering and Landsliding in Northwestern Washington Glacial Terraces

Dynamic Feedbacks Between River Meandering and Landsliding in Northwestern Washington Glacial Terraces

Landsliding in river valleys poses unique risks for cascading hazards and can damage infrastructure and cause fatalities. In postglacial valleys, many landslides are posited to occur in relation to lateral river erosion, but the dynamics of fluvial-hillslope interactions are not well understood. Here, we investigate a section of the Nooksack River in western Washington State where the channel is flanked by landslide-prone glacial terraces similar to those that failed in the 2014 State Route 530 “Oso” landslide. We map 216 landslides through time across 17 aerial imagery data sets (1933–2022) and analyze them in relation to river meandering and curvature. We observe dynamic feedbacks between lateral river meandering and valley-adjacent landsliding. Terrace lateral retreat rates of up to 25 m/year owing to combined fluvial erosion and slope failure occur on pinned, outer meander bends immediately downstream from peaks in river curvature (>0.0075 1/m); these locations are predisposed to both shallow and deep-seated landslides. Deep-seated landslides extending 17%–32% of the active valley width into the floodplain can displace the river away from the floodplain margin and change the channel planform. River-displacing landslides relocate meanders up- or downstream, thereby conditioning the location of subsequent landslides. This conceptual model of coupled landslide-driven meander displacement and valley-adjacent landsliding is exemplified across western Washington river systems. The distance between up- and downstream valley-adjacent landsliding scales with valley width, meander wavelength, and terrace height. Our results can advance our understanding of the river-hillslope interface in landscape evolution and can be used to inform hazard management in river corridors.

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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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