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Vertical variation of mixing within porous sediment beds below turbulent flows
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Chandler, I. D., Guymer, I., Pearson, Jonathan M. and van Egmond, R. (2016) Vertical variation of mixing within porous sediment beds below turbulent flows. Water Resources Research, 52 (5). pp. 3493-3509. doi:10.1002/2015WR018274 ISSN 0043-1397.
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Official URL: http://dx.doi.org/10.1002/2015WR018274
Abstract
River ecosystems are influenced by contaminants in the water column, in the pore water and adsorbed to sediment particles. When exchange across the sediment-water interface (hyporheic exchange) is included in modelling, the mixing coefficient is often assumed to be constant with depth below the interface. Novel fibre-optic fluorometers have been developed and combined with a modified EROSIMESS system to quantify the vertical variation in mixing coefficient with depth below the sediment-water interface. The study considered a range of particle diameters and bed shear velocities, with the permeability Péclet number, image between 1,000 and 77,000 and the shear Reynolds number, image between 5 and 600. Different parameterisation of both an interface exchange coefficient and a spatially variable in-sediment mixing coefficient are explored. The variation of in-sediment mixing is described by an exponential function applicable over the full range of parameter combinations tested. The empirical relationship enables estimates of the depth to which concentrations of pollutants will penetrate into the bed sediment, allowing the region where exchange will occur faster than molecular diffusion to be determined.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
Journal or Publication Title: | Water Resources Research | ||||||||
Publisher: | American Geophysical Union | ||||||||
ISSN: | 0043-1397 | ||||||||
Official Date: | 7 May 2016 | ||||||||
Dates: |
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Volume: | 52 | ||||||||
Number: | 5 | ||||||||
Page Range: | pp. 3493-3509 | ||||||||
DOI: | 10.1002/2015WR018274 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 29 April 2016 | ||||||||
Date of first compliant Open Access: | 11 July 2016 | ||||||||
Adapted As: |
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