Shucksmith, J. D., Boxall, J. B. and Guymer, I.. (2010) Effects of emergent and submerged natural vegetation on longitudinal mixing in open channel flow. Water Resources Research, Vol.46 (Number 4). Article W04504. ISSN 0043-1397

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Abstract

An awareness of mixing processes is imperative in understanding the transport of pollutants in open channel flows, important for environmental impact studies. To date, controlled laboratory studies of the effects of vegetation on mixing processes have used simulated plants. This may neglect some of the important variables introduced by the presence of natural vegetation. In this study natural vegetation was planted within a laboratory channel, and a series of experiments quantifying velocity, turbulence, and longitudinal mixing were conducted over a time period sufficient to allow growth of the vegetation to impact on the mixing processes. In emergent conditions the results generally confirmed previous artificial vegetation and modeling studies, showing that vegetation reduces the magnitude of longitudinal shear dispersion. Additionally, measureable change in longitudinal mixing was observed primarily as a function of flow depth but also of plant age. Normalization using previously suggested parameter combinations failed to yield predictive trends. Submerged tests uniquely covered natural vegetation with a significant wake zone, and from this it was observed that longitudinal mixing is primarily a function of the degree of submergence. Overall, this paper presents a new data set quantifying the effects of natural vegetation on longitudinal mixing processes and illustrating deficiencies in previous understanding and predictive expressions based on idealized artificial vegetation.

Item Type:	Journal Article
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > QH Natural history T Technology > TC Hydraulic engineering. Ocean engineering
Divisions:	Faculty of Science > Engineering
Journal or Publication Title:	Water Resources Research
Publisher:	American Geophysical Union
ISSN:	0043-1397
Date:	6 April 2010
Volume:	Vol.46
Number:	Number 4
Number of Pages:	14
Page Range:	Article W04504
Identification Number:	10.1029/2008WR007657
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC)
URI:	http://wrap.warwick.ac.uk/id/eprint/6094

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