Measurements of flow dynamics associated with interacting, subaqueous barchans: Exploring bedform asymmetry and threedimensionality in a novel flume environment

N. Bristow, G. Blois, Z. Tang, J. M. Barros, J. Best, K. T. Christensen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

While barchan dunes are traditionally associated with aeolian environments, recent efforts now highlight the emergence of barchans in subaqueous environments as well, particularly in rivers. To this end, herein the flow associated with interacting barchan dunes is quantified in the laboratory as a means of understanding a range of morphodynamic issues associated with their evolution. The interaction between barchans of different sizes produces complex processes such as collision, amalgamation and breeding. In this study, idealized, fixed physical models are utilized to permit accurate interrogation of the flow with high-resolution planar particle image velocimetry. Specific simplified geometrical configurations of two fixed barchan dunes in tandem reveal the flow modifications induced by dune proximity as compared to the baseline case of flow around an isolated dune. Initial measurements focused on the latter, followed by measurements of several tandem configurations, while future efforts will focus on configurations which replicate sequential stages in a dune-dune collision.

Original languageEnglish (US)
Title of host publicationRiver Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
EditorsGeorge Constantinescu, Marcelo Garcia, Dan Hanes
PublisherCRC Press/Balkema
Pages443-449
Number of pages7
ISBN (Print)9781138029132
DOIs
StatePublished - Jan 1 2016
EventInternational Conference on Fluvial Hydraulics, RIVER FLOW 2016 - St. Louis, United States
Duration: Jul 11 2016Jul 14 2016

Publication series

NameRiver Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016

Other

OtherInternational Conference on Fluvial Hydraulics, RIVER FLOW 2016
CountryUnited States
CitySt. Louis
Period7/11/167/14/16

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Geotechnical Engineering and Engineering Geology

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    Bristow, N., Blois, G., Tang, Z., Barros, J. M., Best, J., & Christensen, K. T. (2016). Measurements of flow dynamics associated with interacting, subaqueous barchans: Exploring bedform asymmetry and threedimensionality in a novel flume environment. In G. Constantinescu, M. Garcia, & D. Hanes (Eds.), River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016 (pp. 443-449). (River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016). CRC Press/Balkema. https://doi.org/10.1201/9781315644479-72