TY - GEN
T1 - Relations among mean flow, turbulence, and mixing at a small stream confluence
AU - Rhoads, Bruce L.
AU - Lewis, Quinn W.
N1 - Funding Information:
The research in this paper was supported by grant BCS 1359911 from the National Science Foundation. Thanks to Umar Muhammad, Mingjing Yu, and Jessica Z. LeRoy for assistance in the field.
Publisher Copyright:
© 2016 Taylor & Francis Group, London.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2016
Y1 - 2016
N2 - Stream confluences are important locations for mixing in river systems. This study examines the relations among the mean flow, turbulence, and lateral mixing at a small stream confluence. Advective effects associated with secondary motion of the mean flow dominate mixing in the channel downstream of the confluence. Detailed analysis of velocity and turbidity time series at a location corresponding to the time-averaged position of the mixing interface shows that the exact location of the mixing interface is unsteady and dominated by pulses of interacting fluid from each tributary. These pulses of interacting fluid reflect the passage of coherent turbulent structures, generated by lateral shear between the flows, past the point of measurement.
AB - Stream confluences are important locations for mixing in river systems. This study examines the relations among the mean flow, turbulence, and lateral mixing at a small stream confluence. Advective effects associated with secondary motion of the mean flow dominate mixing in the channel downstream of the confluence. Detailed analysis of velocity and turbidity time series at a location corresponding to the time-averaged position of the mixing interface shows that the exact location of the mixing interface is unsteady and dominated by pulses of interacting fluid from each tributary. These pulses of interacting fluid reflect the passage of coherent turbulent structures, generated by lateral shear between the flows, past the point of measurement.
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U2 - 10.1201/9781315644479-255
DO - 10.1201/9781315644479-255
M3 - Conference contribution
AN - SCOPUS:85015305868
SN - 9781138029132
T3 - River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
SP - 1633
EP - 1639
BT - River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
A2 - Constantinescu, George
A2 - Garcia, Marcelo
A2 - Hanes, Dan
PB - CRC Press/Balkema
T2 - International Conference on Fluvial Hydraulics, RIVER FLOW 2016
Y2 - 11 July 2016 through 14 July 2016
ER -