Modelling airflow within model plant canopies using an integrated approach

Endalew, Ayenew Melese; Hertog, Maarten; Gebrehiwot, Mekonnen Gebreslasie; Baelmans, Martine; Ramón, Herman; Nicolaı̈, Bart; Verboven, Pieter

doi:10.1016/j.compag.2008.11.002

Cited by 69 publications

(42 citation statements)

References 31 publications

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“…These include blocks of foam rubber (Rodrigo et al, 2007), Lego™ bricks, Meccano™ wheels (Stacey et al, 1994), wooden pegs, wire mesh (Aubrun and Leitl, 2004), miniature fir trees (Lee and Lee, 2012), bottle brushes (Liang et al, 2005), 3D printed fractal models (Bai et al, 2012), automotive bulbs (Bohm et al, 2013) and architectural model trees (Meroney, 1968;Endalew et al, 2009b;Ruck et al, 2012). Each of these materials have their own merits and allow various aspects of canopy flows to be investigated faster, cheaper and in greater detail than a full-scale experimental campaign.…”

Section: Model Treesmentioning

confidence: 99%

“…In the case of Liang et al (2005), the shadow of an individual brush was examined as a proxy for the vertical structure of the tree canopy. In Bai et al (2012), the actual geometry file used for the 3D printing was utilised whilst in Endalew et al (2009b) and Lee and Lee (2012), photographic techniques were used to capture the required canopy structural data.…”

Section: Model Treesmentioning

confidence: 99%

“…In this paper, we have chosen to use architectural replica trees similar to those used by Endalew et al (2009b). These models, which were sourced from the 4D Modelshop Ltd. (London, UK), are composed of etched brass wire with rough ground silicon to simulate foliage, Fig.…”

Section: Model Treesmentioning

confidence: 99%

“…Also, as discussed in Bohm et al (2013), the use of scale models of vegetation in wind tunnels may result in the flow being dominated by viscous drag which will not be representative of full-scale flows. However, the use of non-bluff bodies to represent forest canopies in wind tunnels is not without precedent (Meroney, 1968;Liang et al, 2005;Endalew et al, 2009b;Lee and Lee, 2012;Ruck et al, 2012). These limitations aside and given that the focus of this study is the role that detailed canopy morphology can play in improving simulations, these model trees were deemed to be the best candidate for experimentation.…”

Section: Model Treesmentioning

confidence: 99%

“…6. Using a value for the drag coefficient Q=0.25, as recommended in Endalew et al (2009b) for similar model trees, L c is calculated as 479 mm. This would indicate that, as the total canopy length is 675 mm, the flow over the model forest will be fully adjusted to the canopy roughness.…”

Section: The Forest Set-upmentioning

confidence: 99%

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A study on the inclusion of forest canopy morphology data in numerical simulations for the purpose of wind resource assessment

Desmond

Watson

Aubrun

et al. 2014

Journal of Wind Engineering and Industrial Aerodynamics

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A series of numerical simulations of the flow over a forest stand have been conducted using two different turbulence closure models along with various levels of canopy morphology data. Simulations have been validated against Stereoscopic Particle Image Velocimetry measurements from a wind tunnel study using one hundred architectural model trees, the porosities of which have been assessed using a photographic technique.It has been found that an accurate assessment of the porosity of the canopy, and specifically the variability with height, improves simulation quality regardless of the turbulence closure model used or the level of canopy geometry included. The observed flow field and recovery of the wake is in line with characteristic canopy flows published in the literature and it was found that the shear stress transport turbulence model was best able to capture this detail numerically.

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Section: Model Treesmentioning

confidence: 99%

Section: Model Treesmentioning

confidence: 99%

Section: Model Treesmentioning

confidence: 99%

Section: Model Treesmentioning

confidence: 99%

Section: The Forest Set-upmentioning

confidence: 99%

See 3 more Smart Citations

A study on the inclusion of forest canopy morphology data in numerical simulations for the purpose of wind resource assessment

Desmond

Watson

Aubrun

et al. 2014

Journal of Wind Engineering and Industrial Aerodynamics

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Pesticide‐laden dust emission and drift from treated seeds during seed drilling: a review

Nuyttens¹,

Devarrewaere

Verboven

et al. 2013

Pest Management Science

124

120

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Dressing seeds with pesticides to control pests is a widespread practice with important advantages. Recent incidents of bee losses, however, have directed attention to the emission of abraded pesticide-coated seed particles to the environment during sowing. This phenomenon of drift of pesticide dust can lead to pesticide contamination of air, water and other natural resources in crop-growing areas. This review article presents the state of the art of the phenomenon of dust emission and drift from pesticide seed dressing during sowing and its consequences. Firstly, pesticide seed treatment is defined and its pros and cons are set out, with the focus on dust, dust emission and dust drift from pesticide-coated seed. The factors affecting emission of pesticide dust (e.g. seed treatment quality, seed drilling technology and environmental conditions) are considered, along with its possible effects. The measuring techniques and protocols and models currently in use for calculating the behaviour of dust are reviewed, together with their features and limitations. Finally, possible mitigation measures are discussed, such as improving the seed quality and the use of modified seed drilling technology, and an overview of regulations and stewardship activities is given.

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