Vertical and horizontal distribution of wind speed and air temperature in a dense vegetation canopy

Jacobs, A.F.G.; Boxel, J.H. van; El-Kilani, R.M.M.

doi:10.1016/0022-1694(94)05093-d

Cited by 21 publications

(13 citation statements)

References 9 publications

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“…During the 2002 experiments there was a notable and significant reduction in wind speed within the vegetation canopy (Figure ), and this flow retardation became progressively more pronounced with higher position up the foredune slope due to enhanced drag exerted by the plants (Wolfe and Nickling, ; Jacobs et al ., ). There is a strong correlation between flow reduction and anemometer position above the datum (0 m on the beach), as shown in Figure .…”

Section: Flow Within the Vegetation Canopymentioning

confidence: 97%

Aeolian dynamics over a coastal foredune, Prince Edward Island, Canada

Hesp

Walker

Chapman

et al. 2013

Earth Surf Processes Landf

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Near‐surface airflow over a morphologically simple, vegetated, 8 m high foredune with a small wave‐cut scarp was measured for onshore to oblique‐onshore conditions during a low‐moderate (5–6 m s‐1 ) wind event and a high velocity (11–18 m s‐1) sand‐transporting gale event. Flow across the foredune was characterized by significant flow compression and acceleration up and across the foredune during both events. During the gale, a pronounced jet (speed bulge) developed at the foredune crest, which increased in magnitude with increasing wind speed. The vertical (W) velocity component of the 3D flow field was positive (upwards) across the stoss slope under low wind conditions but negative (downwards) during gale wind conditions, with upslope acceleration. During the low velocity event, there was speed‐down within the vegetation canopy, as would be expected for a porous roughness cover. During the strong wind event there was speed‐up in the lower portion of the vegetation canopy, and this was found up the entire stoss slope. Sediment transport during the gale force event was substantial across the beach and foredune despite the moderate vegetation cover and minimum fetch. Aeolian suspension was evident in the lee of the dune crest. The observations presented herein show that strong storm winds are an effective mechanism for translating sediment landwards across a high vegetated foredune, contributing sediment to the stoss slope, crest and leeward slopes of the foredune and backing dunes. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Flow Within the Vegetation Canopymentioning

confidence: 97%

Aeolian dynamics over a coastal foredune, Prince Edward Island, Canada

Hesp

Walker

Chapman

et al. 2013

Earth Surf Processes Landf

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“…During the evening, and around sunrise and sunset, the air within the canopy is well mixed and results in a within canopy temperature profile that is more or less constant with height ( Jacobs et al 1992). In the present study the air temperature at two heights within the canopy was measured and the within-canopy air temperature was simulated by a linear profile.…”

Section: Theorymentioning

confidence: 99%

Leaf wetness within a lily canopy

Jacobs

Heusinkveld

Klok

2005

Meteorological Applications

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“…During night-time a well mixed (i.e. a more or less constant temperature) air layer exists within the canopy (Jacobs et al, 1992). In contrast, the air just above the canopy air layer is stable; i.e.…”

Section: General Characteristicsmentioning

confidence: 99%

“…In addition, at the floor of the canopy there is a soil heat towards the canopy. Both processes cause a free convective layer within the canopy, which results in a within-canopy temperature profile that is more or less constant with height (Jacobs et al, 1992(Jacobs et al, , 1994. In the present study the air temperature at two heights within the canopy is measured and the within-canopy air temperature is simulated by a linear profile.…”

mentioning

confidence: 99%

Sensitivity analysis of leaf wetness duration within a potato canopy

Jacobs

Heusinkveld

Kessel

et al. 2009

Meteorological Applications

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ABSTRACT:A description and analysis is given of a wetness duration experiment, carried out in a potato field in the centre of the Netherlands in September 2005. The observations are used to design and evaluate a within-canopy dew model which provides the leaf wetness distribution within the canopy caused by dew processes and by precipitation. This withincanopy dew model consists of three layers (bottom, centre, top) each with equal contribution to the leaf area index. The model results compared favourably with experimental evidence. The sensitivity of the dew and precipitation interception on the amount of free water and the duration of the leaf wetness was analysed by varying the leaf area index and some important weather variables. The findings suggest that the leaf area index affects the amount of free water, but is barely sensitive to leaf wetness duration. Wind speed has hardly any effect on the amount of free water collection as well as on leaf wetness duration. The net radiation, however, appears to be sensitive to the amount of collected free water as well as the leaf wetness duration.

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Vertical and horizontal distribution of wind speed and air temperature in a dense vegetation canopy

Cited by 21 publications

References 9 publications

Aeolian dynamics over a coastal foredune, Prince Edward Island, Canada

Aeolian dynamics over a coastal foredune, Prince Edward Island, Canada

Leaf wetness within a lily canopy

Sensitivity analysis of leaf wetness duration within a potato canopy

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