Preprints
https://doi.org/10.5194/nhess-2021-266
https://doi.org/10.5194/nhess-2021-266

  17 Sep 2021

17 Sep 2021

Review status: this preprint is currently under review for the journal NHESS.

A modeling methodology to study the tributary-junction alluvial fan connectivity during a debris flow event

Alex Garcés1, Gerardo Zegers2, Albert Cabré1, Germán Aguilar1, Aldo Tamburrino1,3, and Santiagio Montserrat1 Alex Garcés et al.
  • 1Advanced Mining Technology Center, Universidad de Chile
  • 2Department of Geosciences, University of Calgary
  • 3Department of Civil Engineering, Universidad de Chile

Abstract. Traditionally, interactions between tributary alluvial fans and the main river have been studied on the field and in the laboratory, giving rise to different conceptual models explaining its role in the sediment cascade. On the other hand, numerical modeling of these complex interactions is still limited because the broad debris flow transport regimes are associated with different sediment transport models. Even though sophisticated models capable of simulating many transport mechanisms simultaneously exist, they are restricted to research purposes due to their high computational cost. In this article, we propose a workflow to model the response of an alluvial fan in the Huasco Valley, located in the Atacama Desert, during an extreme storm event. For the Crucecita Alta alluvial fan, five different deposits were identified and associated with different debris flow surges. Using a commercial software, our workflow concatenates these surges into one model. This study depicts the significance of the mechanical classification of debris flows to reproduce how an alluvial fan controls the tributary-river junction connectivity. Once our model is calibrated, we use our workflow to test if a channel is enough to mitigate the impacts of these flows and the effects on the tributary-river junction connectivity.

Alex Garcés et al.

Status: open (until 10 Nov 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2021-266', Anonymous Referee #1, 05 Oct 2021 reply

Alex Garcés et al.

Alex Garcés et al.

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Short summary
We propose a workflow to model the response of an alluvial fan located in the Atacama Desert, during an extreme storm event. For this alluvial fan, five different deposits were identified and associated with different debris flow surges. Using a commercial software, our workflow concatenates these surges into one model. This study depicts the significance of the mechanical classification of debris flows to reproduce how an alluvial fan controls the tributary-river junction connectivity.
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