A drag force model to incorporate the reconfiguration of full-scale riparian trees under hydrodynamic loading

Whittaker, Peter; Wilson, Catherine; Aberle, Jochen; Rauch, Hans Peter; Xavier, P. A.

doi:10.1080/00221686.2013.822936

Cited by 58 publications

(64 citation statements)

References 38 publications

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“…Our analysis simplified vegetation drag by assuming rigid cylinders, and recent research has suggested this is most accurate for dense vegetation (Vargas-Luna et al, 2016). Future research directions include refining how vegetation drag is represented for sparse vegetation, as well as quantifying changes in drag that result from streamlining and reconfiguration during inundation Boothroyd et al, 2017;Nepf, 2012;Västilä et al, 2013;Västilä and Järvelä, 2014;Whittaker et al, 2013). 5…”

Section: Resultsmentioning

confidence: 99%

The influence of a vegetated bar on channel-bend flow dynamics

Bywater‐Reyes¹,

Diehl²,

Wilcox³

2017

Preprint

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Section: Resultsmentioning

confidence: 99%

The influence of a vegetated bar on channel-bend flow dynamics

Bywater‐Reyes¹,

Diehl²,

Wilcox³

2017

Preprint

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“…As a result, the correct parameterization of the dependence of A p and C d on the flow velocity remains one of the most important problems to solve for the accurate modelling of flexible vegetation. Although some progress has been made by using the 'characteristic' drag coefficient C d A p [29,40,41], this approach does not address the underlying issue that the variation of A p and C d depends not only on flow properties, but also on the vegetation's morphology [20,[42][43][44], biomechanical properties [25,[45][46][47][48], and level of foliation [29,41,49,50].…”

Section: Introductionmentioning

confidence: 99%

An improved Cauchy number approach for predicting the drag and reconfiguration of flexible vegetation

Whittaker

Wilson

Aberle

2015

Advances in Water Resources

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“…The flexible behaviour of vegetation in hydrodynamics can be accounted for by replacing C D to C D 0 in (Eq. 3) [57]. The modified drag coefficient, C D 0 , is calculated (Eq.…”

Section: Parameter Estimationmentioning

confidence: 99%

Resistance and reconfiguration of natural flexible submerged vegetation in hydrodynamic river modelling

et al. 2015

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In-stream submerged macrophytes have a complex morphology and several species are not rigid, but are flexible and reconfigure along with the major flow direction to avoid potential damage at high stream velocities. However, in numerical hydrodynamic models, they are often simplified to rigid sticks. In this study hydraulic resistance of vegetation is represented by an adapted bottom friction coefficient and is calculated using an existing two layer formulation for which the input parameters were adjusted to account for (i) the temporary reconfiguration based on an empirical relationship between deflected vegetation height and upstream depth-averaged velocity, and (ii) the complex morphology of natural, flexible, submerged macrophytes. The main advantage of this approach is that it removes the need for calibration of the vegetation resistance coefficient. The calculated hydraulic roughness is an input of the hydrodynamic model Telemac 2D, this model simulates depth-averaged stream velocities in and around individual vegetation patches. Firstly, the model was successfully validated against observed data of a laboratory flume experiment with three macrophyte species at three discharges. Secondly, the effect of reconfiguration was tested by modelling an in situ field flume experiment with, and without, the inclusion of macrophyte reconfiguration. The inclusion of reconfiguration decreased the calculated hydraulic roughness which resulted in smaller spatial variations of simulated stream velocities, as compared to the model scenario without macrophyte reconfiguration. We discuss that including macrophyte reconfiguration in numerical models input, can have significant and extensive effects on the model results of hydrodynamic variables and associated ecological and geomorphological parameters.& Veerle Verschoren

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A drag force model to incorporate the reconfiguration of full-scale riparian trees under hydrodynamic loading

Cited by 58 publications

References 38 publications

The influence of a vegetated bar on channel-bend flow dynamics

The influence of a vegetated bar on channel-bend flow dynamics

An improved Cauchy number approach for predicting the drag and reconfiguration of flexible vegetation

Resistance and reconfiguration of natural flexible submerged vegetation in hydrodynamic river modelling

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