Wind reduction by a highly permeable tree shelter-belt

Miller, David R.; Rosenberg, Norman J.; Bagley, W. T.

doi:10.1016/0002-1571(74)90027-2

Cited by 23 publications

(9 citation statements)

References 7 publications

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“…Data on wind directions (not shown here) revealed that during the sampling period in 2002 the wind was blowing from different directions during the course of the day, while in 2001 it was predominantly blowing from southwest (shelterbelt is on the south of the field). Other studies also have reported similar magnitudes of wind reduction (Rosenberg et al 1983, Miller et al 1975). Maximum and minimum air temperatures at 3H were generally found to be higher than in the unsheltered (25H) area as the result of the reduction in turbulent mixing.…”

Section: Resultssupporting

confidence: 52%

Modeling surface soil and phosphorus transport using DSSAT models

Egeh

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The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleed-through, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.

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Section: Resultssupporting

confidence: 52%

Modeling surface soil and phosphorus transport using DSSAT models

Egeh

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“…The samplers were placed at distances that were multiples of the orchard canopy height (H) downwind from the edge. Horizontal distances are expressed as x/H because shelter effects downwind from windbreaks (van Eimern, 1964;Brown and Rosenberg, 1970;Miller et al, 1975) and forests edges (Miller et al, 1991) on wind speeds, turbulence, and related transport processes have long been shown to scale with the height of the sheltering canopy.…”

Section: Spray Samplingmentioning

confidence: 99%

Atmospheric Stability Effects on Pesticide Drift From an Irrigated Orchard

Miller¹,

Stoughton²,

Steinke³

et al. 2000

Transactions of the ASAE

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Spray transects through an 11-m-tall pecan orchard with an air-blast orchard sprayer were replicated 10 times over a wide range of atmospheric stability conditions. Drift was measured by collecting tracer (malathion) using ground plates (f), high volume air samplers (hv), and string (s) collectors distributed downwind in the adjacent field out to a maximum distance of 18 canopy heights (198 m). Atmospheric conditions were measured above the orchard canopy with fast-response, three-dimensional wind, temperature, and humidity sensors. Atmospheric stability, characterized by the surface layer stability parameter (ζ), was the primary factor affecting drift amounts measured on and above the adjacent field. On average, the total amount of drift caught by the samplers in very stable conditions was 5.9, 3.6, and 2.1 times the amount of drift in unstable conditions for the plates, the hvs, and the strings, respectively. The transition from one condition to the other took place over a very small stability range where the air was dynamically stable (0.0 < ζ < 0.3). In this range, very small changes in atmospheric conditions resulted in very large changes in the atmosphere's aerosol transport characteristics. The effect of stability on the amount of drift collected in the adjacent field is described by a symmetric hyperbolic tangent function over the entire range of stability encountered.

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“…Miller et al (1975) suggested a shelterbelt drag, characterized by the integrated wind reduction curve or a drag coefficient, as a practical basis for comparison of the effectiveness of different field shelterbelts. Gandemer (1979Gandemer ( , 1981 suggested a shelter parameter based on the generally accepted critical level of discomfort, and the corresponding discomfort wind frequencies.…”

Section: Introductionmentioning

confidence: 99%

Sheltering efficiency of wind barriers on bridges

Kozmar

Procino

Borsani

et al. 2012

Journal of Wind Engineering and Industrial Aerodynamics

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a b s t r a c tSheltering efficiency of wind barriers on viaducts was experimentally studied in a boundary layer wind tunnel. Effects of wind incidence angle on flow field characteristics in the wake of a wind barrier were reported. Mean velocity fields and vorticity fields were determined using the Particle Image Velocimetry (PIV) technique. Freestream velocities were measured using hot-wire and Pitot tube. Results indicate a possibility of wind-induced instability of high-sided vehicles at larger vertical incidence angles, especially in the traffic lane close to trailing edge of the bridge, as velocity fluctuations and mean freestream velocities approach the road surface when increasing the vertical incidence angle. Removing elements from the wind barrier causes very large local velocities immediately downstream from a barrier and strong vorticity in the entire area in the wake of a wind barrier. Variations in horizontal incidence angle do not seem to affect flow field characteristics significantly. Without a wind barrier, wind velocities on bridges reach 80% of the freestream velocity at height as low as 1 m full-scale along with very strong vorticity in the immediate vicinity of the road surface.

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Wind reduction by a highly permeable tree shelter-belt

Cited by 23 publications

References 7 publications

Modeling surface soil and phosphorus transport using DSSAT models

Modeling surface soil and phosphorus transport using DSSAT models

Atmospheric Stability Effects on Pesticide Drift From an Irrigated Orchard

Sheltering efficiency of wind barriers on bridges

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