On the spatial variation of resistance to flow in upland channel networks

On the spatial variation of resistance to flow in upland channel networks Detailed field measurements of channel properties and flow characteristics collected in the Ashley and Cropp catchments (New Zealand) are used to investigate the spatial variation of resistance to flow across upland channel networks. The application of the Darcy‐Weisbach equation and semilogarithmic flow resistance relationships reveals that mean flow velocities calculated from local measurements of bed material particle size, hydraulic depth, and channel bed slope may be inaccurate. The Manning‐Gauckler‐Strickler equation with resistance coefficient independent of bed material particle size is found to be relatively more reliable but not sufficiently general to reproduce the spatial variation of resistance to flow across a complex channel network. A new methodology is developed by combining a hydraulic equation of the Manning‐Gauckler‐Strickler type, a flow discharge‐upstream drainage area relationship, and geomorphological fluvial relationships for mean flow velocity, Gauckler‐Strickler resistance coefficient, hydraulic depth, and friction slope. This methodology is found to improve the reproduction of the spatial variation of mean flow velocity across the Ashley catchment and appears of general applicability for the parameterization of resistance to flow in distributed catchment models. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

On the spatial variation of resistance to flow in upland channel networks

Water Resources Research, Volume 38 (10) – Oct 1, 2002

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Publisher
Wiley
Copyright
Copyright © 2002 by the American Geophysical Union.
ISSN
0043-1397
eISSN
1944-7973
D.O.I.
10.1029/2001WR001187
Publisher site
See Article on Publisher Site

Abstract

Detailed field measurements of channel properties and flow characteristics collected in the Ashley and Cropp catchments (New Zealand) are used to investigate the spatial variation of resistance to flow across upland channel networks. The application of the Darcy‐Weisbach equation and semilogarithmic flow resistance relationships reveals that mean flow velocities calculated from local measurements of bed material particle size, hydraulic depth, and channel bed slope may be inaccurate. The Manning‐Gauckler‐Strickler equation with resistance coefficient independent of bed material particle size is found to be relatively more reliable but not sufficiently general to reproduce the spatial variation of resistance to flow across a complex channel network. A new methodology is developed by combining a hydraulic equation of the Manning‐Gauckler‐Strickler type, a flow discharge‐upstream drainage area relationship, and geomorphological fluvial relationships for mean flow velocity, Gauckler‐Strickler resistance coefficient, hydraulic depth, and friction slope. This methodology is found to improve the reproduction of the spatial variation of mean flow velocity across the Ashley catchment and appears of general applicability for the parameterization of resistance to flow in distributed catchment models.

Journal

Water Resources ResearchWiley

Published: Oct 1, 2002

References

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