Transport of nonsorbing solutes in a streambed with periodic bedforms

Jin, GQ, Tang, HW, Gibbes, B, Li, L and Barry, DA (2010) Transport of nonsorbing solutes in a streambed with periodic bedforms. Advances in Water Resources, 33 11: 1402-1416. doi:10.1016/j.advwatres.2010.09.003

Author Jin, GQ
Tang, HW
Gibbes, B
Li, L
Barry, DA
Title Transport of nonsorbing solutes in a streambed with periodic bedforms
Journal name Advances in Water Resources   Check publisher's open access policy
ISSN 0309-1708
Publication date 2010-11
Sub-type Article (original research)
DOI 10.1016/j.advwatres.2010.09.003
Volume 33
Issue 11
Start page 1402
End page 1416
Total pages 15
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2011
Language eng
Formatted abstract
Previous studies of hyporheic zone focused largely on the net mass transfer of solutes between stream and streambed. Solute transport within the bed has attracted less attention. In this study, we combined flume experiments and numerical simulations to examine solute transport processes in a streambed with periodic bedforms. Solute originating from the stream was subjected to advective transport driven by pore water circulation due to current-bedform interactions as well as hydrodynamic dispersion in the porous bed. The experimental and numerical results showed that advection played a dominant role at the early stage of solute transport, which took place in the hyporheic zone. Downward solute transfer to the deep ambient flow zone was controlled by transverse dispersion at the later stage when the elapsed time exceeded the advective transport characteristic time tc (= L/uc with L being the bedform length and uc the characteristic pore water velocity). The advection-based pumping exchange model was found to predict reasonably well solute transfer between the overlying water and streambed at the early stage but its performance deteriorated at the later stage. With dispersion neglected, the pumping exchange model underestimated the long-term rate and total mass of solute transfer from the overlying water to the bed. Therefore both advective and dispersive transport components are essential for quantification of hyporheic exchange processes.
© 2010 Elsevier Ltd.
Keyword Solute transport
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Special Issue on ground water-surface water interactions - GW-SW Interactions. Edited by Jan H. Fleckenstein, Stefan Krause, David M. Hannah and Fulvio Boano.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 18 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 20 Feb 2011, 00:07:51 EST