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A wind tunnel study of turbulent flow around single and multiple windbreaks, part I: Velocity fields

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Abstract

This paper describes wind-tunnel experiments on the flow around single and multiple porous windbreaks (height H), sheltering a model plant canopy (height H/3). The mean wind is normal to the windbreaks, which span the width of the wind tunnel. The incident turbulent flow simulates the adiabatic atmospheric surface layer. Five configurations are examined: single breaks of three solidities (low, medium, high; solidity = 1 - porosity), and medium-solidity multiple breaks of streamwise spacing 12H and 6H. The experimental emphases are on the interactions of the windbreak flow with the underlying plant canopy; the effects of solidity; the differences in shelter between single and multiple windbreaks; and the scaling properties of the flow. Principal results are: (1) the "quiet zones" behind each windbreak are smaller in multiple than single arrays, because of the higher turbulence level in the very rough-wall internal boundary layer which develops over the multiple arrays. Nevertheless, the overall shelter effectiveness is higher for multiple arrays than single windbreaks because of the "nonlocal shelter" induced by the array as a whole. (2) The flow approaching the windbreak decelerates above the canopy but accelerates within the canopy, particularly when the windbreak solidity is high. (3) A strong mixing layer forms just downwind of the top of each windbreak, showing some of the turbulence and scaling properties of the classical mixing layer formed between uniform, coflowing streams. (4) No dramatic increase in turbulence levels in the canopy is evident at the point where the deepening mixing layer contacts the canopy (around x/H = 3) but the characteristic inflection in the canopy wind profile is eliminated at this point.

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References

  • Argent, R. M.: 1990, ‘Wind Shelter and Crop Protection’, M. Eng. Sci. Thesis, University of Western Ontario, London, Ontario, Canada.

    Google Scholar 

  • Baltaxe, R.: 1967, ‘Airflow Patterns in the Lee of Model Windbreaks’, Arch. Meteorol. Geophys. Bioklimatol. Series B. 15, 287–312.

    Google Scholar 

  • Bean, A., Alperi, R. W., and Federer, C. A.: 1975, ‘A Method for Categorizing Shelterbelt Porosity’, Agric. Meteorol. 14, 417–429.

    Google Scholar 

  • Bradley, E. F. and Mulhearn, P. J.: 1983, ‘Development of Velocity and Shear Stress Distributions in the Wake of a Porous Shelter Fence’, J. Wind Eng. Ind. Aerodyn. 15, 145–156.

    Google Scholar 

  • Brunet, Y., Finnigan, J. J., and Raupach, M. R.: 1994, ‘A Wind Tunnel Study of Air Flow in Waving Wheat: Single Point Velocity Measurements’, Boundary-Layer Meteorol. 70, 95–132.

    Google Scholar 

  • Castro, I. P.: 1971, ‘Wake Characteristics of Two-Dimensional Perforated Plates Normal to an Air Stream’, J. Fluid Mech. 46, 599–609.

    Google Scholar 

  • Castro, I. P. and Haque, A.: 1987, ‘The Structure of a Turbulent Shear Layer Bounding a Separation Region’, J. Fluid Mech. 179, 439–468.

    Google Scholar 

  • Castro, I. P. and Haque, A.: 1988, ‘The Structure of a Shear Layer Bounding a Separation Region. Part 2. Effects of Free-Stream Turbulence’, J. Fluid Mech. 192, 577–595.

    Google Scholar 

  • Counihan, J., Hunt, J. C. R., and Jackson, P. S.: 1974, ‘Wakes Behind Two-Dimensional Surface Obstacles in Turbulent Boundary Layers’, J. Fluid Mech. 64, 529–563.

    Google Scholar 

  • Finnigan, J. J. and Bradley, E. F.: 1983, ‘The Turbulent Kinetic Energy Budget Behind a Porous Barrier: An Analysis in Streamline Coordinates’, J. Wind Eng. Ind. Aerodyn. 15, 157–168.

    Google Scholar 

  • Finnigan, J. J. and Brunet, Y.: 1995, ‘Turbulent Airflow in Forests on Flat and Hilly Terrain’, in M. P. Coutts and J. Grace (eds.), Proc. IUFRO Conf. on Wind and Wind-Related Damage to Trees, Edinburgh, 1993, pp. 3–40, Cambridge University Press: Cambridge.

    Google Scholar 

  • Finnigan, J. J. and Mulhearn, P. J.: 1978, ‘Modelling Waving Crops in a Wind Tunnel’, Boundary-Layer Meteorol. 14, 253–277.

    Google Scholar 

  • Gandemer, J.: 1981, ‘The Aerodynamic Characteristics of Windbreaks Resulting in Empirical Design Rules’, J. Wind Eng. Ind. Aerodyn. 7, 15–36.

    Google Scholar 

  • Guyot, G.: 1986, Manual sur lutilisation des brise-vents dans les zones arides, FAO, Rome.

    Google Scholar 

  • Guyot, G. and Seguin, B.: 1975, ‘Modification of Land Roughness and Resulting Microclimatic Effects: A Field Study in Brittany’, in D. A. de Vries and N. H. Afgan (eds.), Heat and Mass Transfer in the Biosphere, Part I: Transfer Process in the Plant Environment, Scripta Book Co., New York, pp. 467–478.

    Google Scholar 

  • Hagen, L. J. and Skidmore, E. L.: 1971, ‘Turbulent Velocity Fluctuations and Vertical Flow as Affected by Windbreak Porosity’, Trans. ASAE 14, 634–637.

    Google Scholar 

  • Heisler, G. M. and De Walle, D. R.: 1988, ‘Effects of Windbreak Structure on Wind Flow’, Agric. Ecosystems Environ. 22/23, 41–69.

    Google Scholar 

  • Iqbal, M., Khotry, A. K., and Seguin, B.: 1977, ‘A Study of the Roughness Effects of Multiple Windbreaks’, Boundary-Layer Meteorol. 11, 187–203.

    Google Scholar 

  • Jackson, P. S.: 1981, ‘On the Displacement Height in the Logarithmic Velocity Profile’, J. Fluid Mech. 111, 15–25.

    Google Scholar 

  • Jensen, M.: 1958, ‘The Model Law for Phenomena in the Natural Wind’, Igenioren, Int. Edn. 2, 121–128.

    Google Scholar 

  • Kaimal, J. C. and Finnigan, J. J.: 1994, Atmospheric Boundary Layer Flows: Their Structure and Measurement, Oxford University Press, Oxford, 289 pp.

    Google Scholar 

  • Konstantinov, A. R. and Struzer, L. R.: 1965, ‘Shelterbelts and Crop Yields’, Translated by A. Barach. Israel Program for Scientific Translations, 1969, US Dept. of Commerce. Springfield, Va., 138 pp.

    Google Scholar 

  • Laws, E. M. and Livesey, J. L.: 1978, ‘Flow Through Screens’, Ann. Rev. Fluid Mech. 10, 247–266.

    Google Scholar 

  • Legg, B. J., Coppin, P. A., and Raupach, M. R.: 1984, ‘A Three-Hot-Wire Anemometer for Measuring Two Velocity Components in High Intensity Boundary Layers’, J. Phys. E. 17, 970–976.

    Google Scholar 

  • McAneney, K. J. and Judd, M. J.: 1987, ‘Comparative Shelter Strategies for Kiwifruit: A Mechanistic Interpretation of Wind Damage Measurements’, Boundary-Layer Meteorol. 54, 129–146.

    Google Scholar 

  • McAneney, K. J. and Judd, M. J.: 1991, ‘Multiple Windbreaks: An Aeolian Ensemble’, Agric. For. Meteorol. 39, 225–250.

    Google Scholar 

  • McNaughton, K. G.: 1988, ‘Effects of Windbreaks on Turbulent Transport and Microclimate’, Agric. Ecosystems Environ. 22/23, 17–39.

    Google Scholar 

  • Mulhearn, P. J. and Finnigan, J. J.: 1978, ‘Turbulent Flow over a Very Rough, Random Surface’, Boundary-Layer Meteorol. 15, 109–132.

    Google Scholar 

  • Nord, M.: 1991, ‘Shelter Effects of Vegetation Belts — Results of Field Measurements’, Boundary-Layer Meteorol. 54, 363–385.

    Google Scholar 

  • Panofsky, H. E. and Dutton, J. A.: 1984, Atmospheric Turbulence: Models and Methods for Engineering Applications, Wiley, New York, 397 pp.

    Google Scholar 

  • Perera, M. D. A. E. S.: 1981, ‘Shelter Behind Two Dimensional Solid and Porous Fences’, J. Wind Eng. Ind. Aerodyn. 8, 93–104.

    Google Scholar 

  • Plate, E. J.: 1971a, ‘Aerodynamic Characteristics of Atmospheric Boundary Layers’, US Atomic Energy Commission, Office of Information Services, Oak Ridge.

    Google Scholar 

  • Plate, E. J.: 1971b, ‘The Aerodynamics of Shelter Belts’, Agric. Meteorol. 8, 203–222.

    Google Scholar 

  • Raine, J. K. and Stevenson, D. C.: 1977, ‘Wind Protection by Model Fences in a Simulated Atmosphere Boundary Layer’, J. Ind. Aerodyn. 2, 159–180.

    Google Scholar 

  • Raupach, M. R.: 1988, ‘Canopy Transport Processes’, in W. L. Steffen and O. T. Denmead (eds.), Flow and Transport in the Natural Environment: Advances and Applications, Springer-Verlag, Berlin, pp. 95–127.

    Google Scholar 

  • Raupach, M. R., Thom, A. S., and Edwards, I.: 1980, ‘A Wind Tunnel Study of Turbulent Flow Close to Regularly Arrayed Rough Surfaces’, Boundary-Layer Meteorol. 18, 373–397.

    Google Scholar 

  • Raupach, M. R., Coppin, P. A., and Legg, B. J.: 1986, ‘Experiments on Scalar Dispersion within a Model Plant Canopy, Part I: The Turbulence Structure’, Boundary-Layer Meteorol. 35, 21–52.

    Google Scholar 

  • Rogers, M. M. and Moser, R. D.: 1994, ‘Direct Simulation of a Self-Similar Turbulent Mixing Layer’, Phys. Fluids 6, 903–923.

    Google Scholar 

  • Ruderich, R. and Fernholz, H. H.: 1986, ‘An Experimental Investigation of a Turbulent Shear Flow with Separation, Reverse Flow, and Reattachment’, J. Fluid Mech. 163, 283–322.

    Google Scholar 

  • Schlichting, H.: 1968, Boundary Layer Theory, McGraw-Hill, New York, 747 pp.

    Google Scholar 

  • Seguin, B. and Gignoux, M.: 1974, ‘Etude expérimentale de l'influence d'un réseau de brise-vent sur le profile vertical de vitesse du vent’, Agric. Meteorol. 13, 15–33.

    Google Scholar 

  • Sturrock, J. W.: 1969, ‘Aerodynamic Studies of Shelterbelts in New Zealand - 1: Low to Medium-Height Shelterbelts in Mid-Canterbury’, N.Z. J. Sci. 12, 754–776.

    Google Scholar 

  • Thom, A. S.: 1971, ‘Momentum Absorption by Vegetation’, Quart. J. Roy. Meteorol. Soc. 97, 414–428.

    Google Scholar 

  • Townsend, A. A.: 1976, The Structure of Turbulent Shear Flow, Cambridge University Press, Cambridge, 429 pp.

    Google Scholar 

  • Van Eimern, J., Karschon, R., Razumova, L. A., and Robertson, G. W.: 1964, ‘Windbreaks and Shelterbelts’, WMO Technical Note No. 59 (WMO No. 147.TP.70), 188 pp.

  • Wang, Zhengquan, Shi, Jiachen, and Wang, Yehchu: 1990, ‘Application of the Boundary Layer Models to Simulate Wind Velocity Profiles of Shelterbelts’, in Xiang, Kaifu, Shi, Jiachen, Baer, N. M., and Sturrock, J. W. (eds.), Protective Plantation Technology, Publishing House of Northeast Forestry University, China.

    Google Scholar 

  • Wilson, J. D.: 1985, ‘Numerical Studies of Flow Through a Windbreak’, J. Wind Eng. Ind. Aerodyn. 21, 119–154.

    Google Scholar 

  • Wilson, J. D.: 1987, ‘On the Choice of a Windbreak Porosity Profile’, Boundary-Layer Meteorol. 38, 37–49.

    Google Scholar 

  • Wilson, J. D., Swaters, G. E., and Ustina, F.: 1990, ‘A Perturbation Analysis of Turbulent Flow through a Porous Barrier’, Quart. J. Roy. Meteorol. Soc. 116, 989–1004.

    Google Scholar 

  • Wooding, R. A.: 1968, ‘A Low Speed Wind Tunnel for Model Studies in Micrometeorology. II. The Pye Laboratory Wind Tunnel’, Aust. CSIRO Div. Plant Ind. Tech. Pap. No. 25, pp. 1–24.

    Google Scholar 

  • Woodruff, P. N. and Zingg, A. W.: 1955, ‘A Comparative Analysis of Wind Tunnel and Atmospheric Air Flow Patterns about Single and Successive Barriers’, Trans. Amer. Geophys. Union 36, 203–208.

    Google Scholar 

  • Wygnanski, I. and Fiedler, H. E.: 1970, ‘The Two Dimensional Mixing Region’, J. Fluid Mech. 41, 327–361.

    Google Scholar 

  • Zhuang, Y. and Wilson, J. D.: 1994, ‘Coherent Motions in Windbreak Flow’, Boundary-Layer Meteorol. 70, 151–169.

    Google Scholar 

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Authors and Affiliations

  1. Horticultural and Food Research Institute of NZ, PO Box 23, Kerikeri, New Zealand

    M. J. Judd & M. R. Raupach

  2. CSIRO Centre for Environmental Mechanics, GPO Box 821, 2601, Canberra, ACT, Australia

    J. J. Finnigan

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  1. M. J. Judd
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  2. M. R. Raupach
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  3. J. J. Finnigan
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Judd, M.J., Raupach, M.R. & Finnigan, J.J. A wind tunnel study of turbulent flow around single and multiple windbreaks, part I: Velocity fields. Boundary-Layer Meteorol 80, 127–165 (1996). https://doi.org/10.1007/BF00119015

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