J. Holden
Overland flow velocity and roughness properties in peatlands
Holden, J.; Kirkby, M.J.; Lane, S.N.; Milledge, D.G.; Brookes, C.J.; Holden, V.; McDonald, A.T.
Authors
M.J. Kirkby
S.N. Lane
D.G. Milledge
C.J. Brookes
V. Holden
A.T. McDonald
Abstract
Overland flow is an important component of peatland hydrology. Hydrological models of peatlands are being developed that require estimates of flow velocity and its controls. However, surprisingly little is known about overland flow velocities in peatlands. Some peatlands have also been drained using open ditches, and these need to be incorporated into flow models. This paper presents field data on the velocity of overland flow and drain flow in upland peatlands. The relationships between flow velocity, vegetation cover, slope, and water depth are explored. Sphagnum provided a significantly greater effective hydraulic roughness to overland flow than peatland grasses. In all cases, a significant break in process occurred for flows with water depths of around 1 cm so that there were two components of the roughness curve. This is consistent with partial submergence theory for very shallow flows where resistance increases with depth as the soil surface first becomes fully submerged. While each surface cover type should be considered separately, the results also suggest that a first-order estimate of Darcy-Weisbach roughness and mean velocity can be based on a single parameter for each surface cover. This paper presents an empirical overland flow velocity forecasting model that can be applied to peatlands. The model combines the partially submerged component for flows with water depths below 1 cm with the fully submerged component for flows with depths up to 5 cm, which are representative of the depths of flows that occur across peatlands.
Citation
Holden, J., Kirkby, M., Lane, S., Milledge, D., Brookes, C., Holden, V., & McDonald, A. (2008). Overland flow velocity and roughness properties in peatlands. Water Resources Research, 44(6), Article W06415. https://doi.org/10.1029/2007wr006052
Journal Article Type | Article |
---|---|
Publication Date | Jun 20, 2008 |
Deposit Date | Sep 9, 2009 |
Publicly Available Date | Mar 24, 2010 |
Journal | Water Resources Research |
Print ISSN | 0043-1397 |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 44 |
Issue | 6 |
Article Number | W06415 |
DOI | https://doi.org/10.1029/2007wr006052 |
Keywords | Blanket peat, Surface-roughness, Resistance, Erosion, Runoff, Hydrodynamics, Hydraulics, Catchments, Vegetation, Drainage, Overland flow, Wetlands. |
Publisher URL | http://www.agu.org/journals/wr/wr0806/2007WR006052/ |
Files
Published Journal Article
(718 Kb)
PDF
Copyright Statement
© 2008 American Geophysical Union. Holden, J., Kirkby, M. J., Lane, S. N., Milledge, D. G., Brookes, C. J., Holden, V. and McDonald, A. T. (2008), 'Overland flow velocity and roughness properties in peatlands', Water resources research, 44, W06415, 10.1029/2007WR006052 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI.
You might also like
Population density controls on microbial pollution across the Ganga catchment
(2017)
Journal Article
Earthquake science in DRR policy and practice in Nepal
(2016)
Working Paper
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search