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A phenomenological model for the flow resistance over submerged vegetation

Publication ,  Journal Article
Konings, AG; Katul, GG; Thompson, SE
Published in: Water Resources Research
February 29, 2012

The bulk velocity U b in streams is conventionally estimated from Manning's equation, but difficulties remain in parameterizing the roughness coefficient n when the streambed is covered with vegetation. A two-layer velocity model is proposed to determine n and U b for the submerged vegetation case. The modeled n is derived as a function of flow and vegetation properties that can be inferred from remote sensing platforms, such as canopy height, leaf area density, and flow depth. The main novelty in the proposed formulation is that the shear stress is related to the mean velocity profile by considering both ejective and sweeping motions by dominant eddies. The proposed model is tested against a large data set from the literature and is shown to perform well, particularly for rigid vegetation. Poorer model performance for flexible vegetation can be partially attributed to the shape of the assumed mean velocity profile. The roughness coefficient n is found to be robust to variations in the average spacing between canopy elements, allowing the model to be applied to heterogeneous canopies. Copyright 2012 by the American Geophysical Union.

Duke Scholars

Published In

Water Resources Research

DOI

ISSN

0043-1397

Publication Date

February 29, 2012

Volume

48

Issue

2

Related Subject Headings

  • Environmental Engineering
  • 4011 Environmental engineering
  • 4005 Civil engineering
  • 3707 Hydrology
  • 0907 Environmental Engineering
  • 0905 Civil Engineering
  • 0406 Physical Geography and Environmental Geoscience
 

Citation

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MLA
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Konings, A. G., Katul, G. G., & Thompson, S. E. (2012). A phenomenological model for the flow resistance over submerged vegetation. Water Resources Research, 48(2). https://doi.org/10.1029/2011WR011000
Konings, A. G., G. G. Katul, and S. E. Thompson. “A phenomenological model for the flow resistance over submerged vegetation.” Water Resources Research 48, no. 2 (February 29, 2012). https://doi.org/10.1029/2011WR011000.
Konings AG, Katul GG, Thompson SE. A phenomenological model for the flow resistance over submerged vegetation. Water Resources Research. 2012 Feb 29;48(2).
Konings, A. G., et al. “A phenomenological model for the flow resistance over submerged vegetation.” Water Resources Research, vol. 48, no. 2, Feb. 2012. Scopus, doi:10.1029/2011WR011000.
Konings AG, Katul GG, Thompson SE. A phenomenological model for the flow resistance over submerged vegetation. Water Resources Research. 2012 Feb 29;48(2).
Journal cover image

Published In

Water Resources Research

DOI

ISSN

0043-1397

Publication Date

February 29, 2012

Volume

48

Issue

2

Related Subject Headings

  • Environmental Engineering
  • 4011 Environmental engineering
  • 4005 Civil engineering
  • 3707 Hydrology
  • 0907 Environmental Engineering
  • 0905 Civil Engineering
  • 0406 Physical Geography and Environmental Geoscience