Field Determination of Manning's
            <i>n</i>
            Value for Shrubs and Woody Vegetation

Freeman, Gary E.; Copeland, Ronald R.; Rahmeyer, William J.; Derrick, David L.

doi:10.1061/40382(1998)7

Cited by 7 publications

(3 citation statements)

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“…In its most simplistic form, the resistance generated by vegetation is commonly described through an extra bed friction term such as Manning coefficient or Darcy‐Weisbach friction factors . Due to their simplicity, these friction factors are popular . However, as noted by Wamsley et al these extra bed friction terms may not be appropriate as they do not explicitly account for vegetated drag, especially when the plant is in an emergent state.…”

Section: The Influence Of Vegetation Structure and Plant Mechanical Pmentioning

confidence: 99%

“…2,57 Due to their simplicity, these friction factors are popular. 52,61,62 However, as noted by Wamsley et al 63 these extra bed friction terms may not be appropriate as they do not explicitly account for vegetated drag, especially when the plant is in an emergent state. Therefore, while these approaches may be suitable for 1D considerations of flow modification, generally these coefficients do not allow for complex and/or detailed examinations of flow.…”

Section: Modeling Plant-flow Interactionsmentioning

confidence: 99%

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A review of plant‐flow interactions on salt marshes: the importance of vegetation structure and plant mechanical characteristics

2015

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Observations of plant-flow interactions on salt marshes have revealed a highly complex process dominated by the tightly coupled effects of plant characteristics and hydrodynamic conditions. This paper highlights the importance of vegetation structures such as plant density and height, as well as their spatial variability and mechanical properties including flexibility, upon energy dissipation and flow modification. Many field, laboratory and modeling studies which attempt to predict flow dissipation or improve our understanding of plant-flow interactions use simplified structural measures of salt marsh vegetation or artificial representations. These simplifications neglect important plant and canopy elements and are unlikely to be truly representative of their natural counterparts. Such approaches limit our understanding of plant-flow interactions and potentially compromise the predictive accuracy and application of numerical flow models. It is important therefore that improved techniques to measure vegetation structure are adopted in order to better define the key relationships between measurable plant characteristics and dragrelevant plant properties.

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Section: The Influence Of Vegetation Structure and Plant Mechanical Pmentioning

confidence: 99%

Section: Modeling Plant-flow Interactionsmentioning

confidence: 99%

A review of plant‐flow interactions on salt marshes: the importance of vegetation structure and plant mechanical characteristics

2015

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“…(3) Freeman et al (1998) Barnes(1967), Jarrett(1985), Annable(1996), Gillen (1996), Hicks and Mason(1998), Coon(1998), Phillips and Ingersoll(1998), Lang et al (2004), Soong et al 2009 (Julien, 2010).…”

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confidence: 99%

Derivation of Roughness Coefficient Relationships Using Field Data in Vegetated Rivers

Lee¹,

Juliën²,

Kim³

et al. 2012

Journal of Korea Water Resources Association

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Field measurements of resistance to flow are analyzed for 739 rivers vegetated with grass (281 channels), shrubs (150 channels) and trees (308 channels). The measured distribution of Manning roughness coefficients ranges from 0.015∼0.250 for grass, 0.016∼0.250 for shrubs, 0.018∼0.310 for trees. Significant trends are obtained between Darcy-Weisbach (or Manning roughness coefficients) and flow discharge, friction slope, and relative submergence. The regression equations for Darcy-Weisbach and Manning roughness coefficients in vegetated rivers are:

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