Physical experiments on interactions between main-channels and tributary alluvial fans

  • Owner: Sara Savi
  • Created on Feb 07, 2020
  • Access: Public
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http://orcid.org/0000-0001-5515-753X , http://orcid.org/0000-0001-8359-2950 , http://orcid.org/0000-0002-9545-3365 , http://orcid.org/0000-0002-8551-7265 , http://orcid.org/0000-0002-4236-4609 , Manfred Strecker
Description:

This dataset includes all measured information and digital elevation models of the experiments reported in the following manuscript: https://www.earth-surf-dynam-discuss.net/esurf-2019-73/ Abstract of the paper: 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 promote or prevent sediment to be moved within the fluvial system, creating different coupling conditions. A prograding alluvial fan, for example, has the potential to disrupt the sedimentary signal propagating downstream through the confluence zone. By analyzing different environmental scenarios, our results indicate the contribution of the two sub-systems to fluvial deposits, both upstream and downstream of the tributary junction, which may be diagnostic of a perturbation affecting the tributary or the main channel only. 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 is essential for a correct reconstruction of the climatic or tectonic history of a basin.

Metadata

Name Value Last Modified
Primary/Initial Publication Added by Sara Savi on Mar 26, 2020
Funding Institution
  • This research has been supported by the Deutsche Forschungsgemeinschaft (grant no. SCHI 1241/1-1 and grant no. SA 3360/2-1), the Alexander von Humboldt-Stiftung (grant no. ITA 1154030 STP), and the University of Minnesota.
Added by Sara Savi on Mar 26, 2020
Contact
  • Corresponding Author: Sara Savi (savi@geo.uni-potsdam.de)
Added by Sara Savi on Mar 26, 2020
Bibliographic Citation
  • Sara Savi, Stefanie Tofelde, Andrew D. Wickert, Aaron Bufe, Taylor F. Schildgen, and Manfred R. Strecker. Interactions between main-channels and tributary alluvial fans: channel adjustments and sediment-signal propagation. SEAD Internal Repository.
Added by Sara Savi on Mar 26, 2020
  • Funding Institution: This research has been supported by the Deutsche Forschungsgemeinschaft (grant no. SCHI 1241/1-1 and grant no. SA 3360/2-1), the Alexander von Humboldt-Stiftung (grant no. ITA 1154030 STP), and the University of Minnesota.
  • Contact: Corresponding Author: Sara Savi (savi@geo.uni-potsdam.de)
  • Bibliographic Citation: Sara Savi, Stefanie Tofelde, Andrew D. Wickert, Aaron Bufe, Taylor F. Schildgen, and Manfred R. Strecker. Interactions between main-channels and tributary alluvial fans: channel adjustments and sediment-signal propagation. SEAD Internal Repository.

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