Hyporheic flow under periodic bed forms influenced by low-density gradients

Jin, Guangqiu, Tang, Hongwu, Li, Ling and Barry, D. A. (2011) Hyporheic flow under periodic bed forms influenced by low-density gradients. Geophysical Research Letters, 38 22: L22401.1-L22401.6. doi:10.1029/2011GL049694

Author Jin, Guangqiu
Tang, Hongwu
Li, Ling
Barry, D. A.
Title Hyporheic flow under periodic bed forms influenced by low-density gradients
Journal name Geophysical Research Letters   Check publisher's open access policy
ISSN 0094-8276
Publication date 2011-11-01
Year available 2011
Sub-type Article (original research)
DOI 10.1029/2011GL049694
Open Access Status Not yet assessed
Volume 38
Issue 22
Start page L22401.1
End page L22401.6
Total pages 6
Place of publication Washington, DC, United States
Publisher American Geophysical Union
Language eng
Abstract Small density variations across streambeds due to low solute concentrations in stream water exist commonly in streams and rivers. Using laboratory experiments and numerical modeling, we demonstrated that even small density variations can influence hyporheic flow in streambeds with periodic bed forms. The circulating pore water flow patterns in the bed were modified constantly as the solute front moved downward. Density-induced head gradients eventually overwhelmed the regional hydraulic gradient and drove the circulating flow below a hydraulic divide that would have existed without the density influence. The density-modified hyporheic flow provided a relatively fast solute transport mechanism and enhanced the overall mass exchange between the stream and bed. These results highlight the important role of weak, upward density gradients in modulating hyporheic flow.
Keyword Laboratory Experiments
Nonsorbing Solutes
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 50925932
Institutional Status UQ
Additional Notes Article number L22401

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2012 Collection
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