Interactions between main channels and tributary alluvial fans: channel adjustments and sediment-signal propagation
Interactions between main channels and tributary alluvial fans: channel adjustments and sediment-signal propagation
复制标题
主河道与支流冲积扇之间的相互作用：河道调整和沉积物信号传播
DOI：
10.5194/esurf-8-303-2020
复制
发表时间：
2020
期刊：
影响因子：
6.7
通讯作者：
M. Strecker
中科院分区：
文献类型：
--
作者：
S. Savi;Stefanie Tofelde;A. Wickert;Aaron Bufe;T. Schildgen;M. Strecker
抽象的。气候和构造影响河流系统的水和泥沙通量。
这些边界条件决定了河流的形态，并可由河流记录下来
押金。从这些矿床重建边界条件，
然而，复杂的渠道-网络交互和
相关的沉积物通过河流系统储存和释放。至
为了应对这一挑战，我们利用物理实验研究了不同强迫条件下主干道和支流之间的相互作用。特别是，我们调查了单一支流交汇处，支流的泥沙供应可以产生冲积扇，对河道几何形状和相关的泥沙传输动力学的影响。我们发现，冲积扇的存在可以促进或阻止河流系统内沉积物的运动，从而创造不同的耦合条件。通过分析不同的环境情景，我们的结果揭示了主河道和支流对支流交界处上下游河流沉积的贡献。我们在一个新的概念框架中总结了所有的发现，该框架说明了不同环境条件下支流冲积扇和主河道之间可能的相互作用。这一框架可以更好地了解在汇流带发现的河流沉积沉积的组成和结构，这有助于重建盆地的气候或构造历史。
Abstract. Climate and tectonics impact water and sediment fluxes to fluvial systems.
These boundary conditions set river form and can be recorded by fluvial
deposits. Reconstructions of boundary conditions from these deposits,
however, is complicated by complex channel–network interactions and
associated sediment storage and release through the fluvial system. To
address this challenge, we used a physical experiment to study the interplay between a main channel and a tributary under different forcing conditions. In particular, we investigated the impact of a single tributary junction, where sediment supply from the tributary can produce an alluvial fan, on channel geometries and associated sediment-transfer dynamics. We found that the presence of an alluvial fan may either promote or prevent the movement of sediment within the fluvial system, creating different coupling conditions. By analyzing different environmental scenarios, our results reveal the contribution of both the main channel and the tributary to fluvial deposits upstream and downstream from the tributary junction. We summarize all findings in a new conceptual framework that illustrates the possible interactions between tributary alluvial fans and a main channel under different environmental conditions. This framework provides a better understanding of the composition and architecture of fluvial sedimentary deposits found at confluence zones, which can facilitate the reconstruction of the climatic or tectonic history of a basin.
DOI：
10.1002/2015jf003607
发表时间：
2016-02
期刊：
Journal of Geophysical Research: Earth Surface
影响因子：
--
作者：
T. Schildgen;R. Robinson;S. Savi;W. Phillips;J. Spencer;B. Bookhagen;D. Scherler;Stefanie Tofelde;R. Alonso;P. Kubik;S. Binnie;M. Strecker
通讯作者：
T. Schildgen;R. Robinson;S. Savi;W. Phillips;J. Spencer;B. Bookhagen;D. Scherler;Stefanie Tofelde;R. Alonso;P. Kubik;S. Binnie;M. Strecker
对泥石流活动和沉积物堆积的气候控制：阿根廷西北部的德尔梅迪奥扇
DOI：
10.1002/2016jf003912
发表时间：
2016
期刊：
Journal of Geophysical Research: Earth Surface
影响因子：
--
作者：
Schildgen;Tofelde;Wittmann;Scherler;Alonso;Strecker
通讯作者：
Strecker