Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
MORPHOLOGY AND GRAIN DISPLACEMENTS OF TWO INTERACTING BARCHANS
Submission Author:
Willian Righi Assis , SP
Co-Authors:
Willian Righi Assis, Erick de Moraes Franklin
Presenter: Willian Righi Assis
doi://10.26678/ABCM.ENCIT2020.CIT20-0100
Abstract
The crescent-shaped forms, known as barchan dunes, are formed in areas of unidirectional fluid flow and limited supply of granular material. Barchans are organized in dune fields, where occur interaction among dunes with similar or different speeds and sizes. In a previous study (Assis and Franklin (2020)), the short-range interactions occurring between two subaqueous barchans were experimentally investigated and five different patterns were identified. As a continuation, this work investigates the morphology and grain displacements occurring between two barchans with similar masses (called before as Chasing pattern). The experiment was conducted in a closed-conduit channel where a target dune was in a downstream position of a granular pile and a high-speed camera was used to track the interaction. The acquired images were treated using an image processing code. As results, we observed, through relations between width, length, and horns length of dunes, that the morphology of downstream dune is affected by the disturbance that the upstream dune causes in the fluid flow. In addition, particles exchanged between dunes were followed throughout the interaction and trajectories and velocities were calculated.
Keywords
barchan dunes, morphology, Interaction
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