Videos provided by Mauricio Perillo, PhD Student
Department of Geology
University of Illinois at Urbana-Champaign

They show two experiments of combined flow (i.e. oscillatory and unidirectional currents) in a closed flume. Experimental conditions are shown at the start of each video. Note that once bedforms begin to develop they rapidly evolve into three-dimensional features. It he low velocity experiment (U10) the bedforms are relatively symmetrical but have net down flow migration. At higher (U30) unidirectional flow, bedforms are more asymmetric, but not as much as in solely unidirectional flows.

 

EXPERIMENT T05O20U10

In this experiment, conducted at The Ven Te Chow Hydrosystems Lab at University of Illinois, M.M. Perillo measured the development of bedforms under combined flows (wave-currents).  In this particular condition the oscillation period was 5 seconds, the maximum orbital velocity was 0.2 m/s and the current velocity was 0.1 m/s.  The experiment started from a flat bed and bedforms develop from defects either from the walls or small imperfections in the flat bed. 
Details on this and other experiment can be found at:
https://netfiles.uiuc.edu/mperill2/www/


EXPERIMENT T05O20U30

In this experiment, conducted at The Ven Te Chow Hydrosystems Lab at University of Illinois, M.M. Perillo measured the development of bedforms under combined flows (wave-currents).  In this particular condition the oscillation period was 5 seconds, the maximum orbital velocity was 0.2 m/s and the current velocity was 0.3 m/s. Late in this experiment the amount of suspended material increases obscuring the image.

Details on this and other experiment can be found at:
https://netfiles.uiuc.edu/mperill2/www/

 

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