Seismic constraints on dynamic links between geomorphic processes and routing of sediment in a steep mountain catchment
Seismic constraints on dynamic links between geomorphic processes and routing of sediment in a steep mountain catchment
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陡峭山区流域地貌过程与沉积物路径之间动态联系的地震约束
DOI：
10.5194/esurf-2-21-2014
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发表时间：
2013
影响因子：
7.4
通讯作者：
Jérôme Vergne
中科院分区：
文献类型：
--
作者：
A. Burtin;N. Hovius;B. McArdell;J. Turowski;Jérôme Vergne
抽象的。景观动态是由地貌过程之间的相互作用决定的。这些相互作用使构造、气候和地震扰动的影响能够跨越地形领域传播，并使地貌过程事件的影响能够从其起源点辐射出去。视觉遥感和现场观测不能完全解决的时空格局的表面过程中的景观。因此，地貌连通性的机制和规模知之甚少。由于许多地表过程发出地震信号，地震学可以确定它们的类型、位置和时间，其分辨率揭示了整体景观的运作。利用地震记录，我们展示了如何在阿尔卑斯山流域的山坡和渠道相互连接，以产生不断变化的，泥沙流动。这是一个对流风暴，它引发了一系列的山坡过程和泥石流。我们观察这些过程事件的演变，并探讨质量浪费和通道过程，这是最基本的侵蚀景观的动态之间的双向联系的操作。我们还跟踪的特性和传播的流沿着的泥石流通道，所观察到的能量的变化，沉积物的沉积/动员，并使用泥石流地震信号的频谱内容，定性地推断沉积物的特性和通道磨损的潜力。这种地震学方法可有助于检验地貌动态的理论概念，了解各个地貌过程之间联系的性质和效率，这是在不断变化的构造或气候条件下准确模拟地貌动态和预测与特定气象事件有关的自然灾害风险所必需的。
Abstract. Landscape dynamics are determined by interactions amongst geomorphic processes. These interactions allow the effects of tectonic, climatic and seismic perturbations to propagate across topographic domains, and permit the impacts of geomorphic process events to radiate from their point of origin. Visual remote sensing and in situ observations do not fully resolve the spatiotemporal patterns of surface processes in a landscape. As a result, the mechanisms and scales of geomorphic connectivity are poorly understood. Because many surface processes emit seismic signals, seismology can determine their type, location and timing with a resolution that reveals the operation of integral landscapes. Using seismic records, we show how hillslopes and channels in an Alpine catchment are interconnected to produce evolving, sediment-laden flows. This is done for a convective storm, which triggered a sequence of hillslope processes and debris flows. We observe the evolution of these process events and explore the operation of two-way links between mass wasting and channel processes, which are fundamental to the dynamics of most erosional landscapes. We also track the characteristics and propagation of flows along the debris flow channel, relating changes of observed energy to the deposition/mobilization of sediments, and using the spectral content of debris flow seismic signals to qualitatively infer sediment characteristics and channel abrasion potential. This seismological approach can help to test theoretical concepts of landscape dynamics and yield understanding of the nature and efficiency of links between individual geomorphic processes, which is required to accurately model landscape dynamics under changing tectonic or climatic conditions and to anticipate the natural hazard risk associated with specific meteorological events.
影响因子：
5.8
作者：
P. Schuerch;A. Densmore;N. Rosser;B. McArdell
通讯作者：
P. Schuerch;A. Densmore;N. Rosser;B. McArdell