Abstract
This note describes estimation of the zero-plane displacement derived from experimental windspeed measurements above an 18 m pine forest and an 8–9 m savannah using a ‘mass conservation technique’ mentioned by Tajchman (1981). The results obtained using this analysis exhibit a lack of sensitivity to experimental errors which is in marked contrast to those commonly obtained over tall vegetation using more conventional least-square analyses. The consistency in the results allows an investigation of the windspeed dependence of the aerodynamic properties of the mean horizontal airflow over tall vegetation, and permits consideration of the effect of experimental errors on such dependence.
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References
Cionco, R. M.: 1972, ‘A Wind-Profile Index for Canopy Flow’, Boundary-Layer Meteorol. 3, 255–263.
Clarke, R. H. and Brook, R. R.: 1979, The Koorin Expedition — Atmospheric Boundary Layer Data over Tropical Savannah Land, Dept. of Sci., Canberra.
Garratt, J. R.: 1978, ‘Flux Profile Relations above Tall Vegetation’, Quart. J. R. Meteorol. Soc. 104, 199–211.
Garratt, J. R.: 1980, ‘Surface Influences upon Vertical Profiles in the Atmospheric Near-Surface Layer’, Quart. J. R. Meteorol. Soc. 106, 803–819.
Hicks, B. B., Hess, G. D., and Wesely, M. L.: 1979, ‘Analysis of Flux-Profile Relationships above Tall Vegetation — an Alternative View’, Quart. J. R. Meteorol. Soc. 105, 1074–1077.
Marunich, S. V.: 1971, ‘Kharakteristiki turbulentnosti v usloviyakh lesa po gradientnym i strukturnym wablyudeniyam’, Trudy G. G. I. 198, 154–165.
Monteith, J. L.: 1973, Principles of Environmental Physics, Edward Arnold Pub. London 241 pp.
Moore, C. J.: 1974, ‘A Comparative Study of Forest and Grassland Micrometeorology’, Ph.D. Thesis, Flinders Univ. of S. Aust.
Rauner, Yu. L. and Ananev, I. P.: 1971, ‘Kharakteristiki atmosfernoy turbulentnosti v usloviyakh lesa’, Izv. Akad. Nauk SSSR, Ser. Geogr. 2, 70–79.
Raupach, M. R.: 1979, ‘Anomalies in Flux-Gradient Relationships over Forest’, Boundary-Layer Meteorol. 16, 467–486.
Robinson, S. M.: 1962, ‘Computing Wind Profile Parameters’, J. Atm. Sci. 19, 189–190.
Smith, F. B., Carson, D. J., and Oliver, H. R.: 1972, ‘Mean Wind-Direction Shear Through a Forest Canopy’, Boundary-Layer Meteorol. 3, 178–190.
Stearns, C. R.: 1970, ‘Determining Surface Roughness and Displacement Height’, Boundary-Layer Meteorol. 1, 102–111.
Tajchman, S. J.: 1981, ‘Comments on Measuring Turbulent Exchange within and above Forest Canopy’, Bull. Am. Meteorol. Soc. 62, 1550–1559.
Tennekes, H. and Lumley, J. L.: 1972, A First Course in Turbulence, M.I.T. Press, Cambridge, Mass.
Thom, A. S.: 1971, ‘Momentum Absorption by Vegetation’, Quart. J. R. Meteorol. Soc. 97, 414–428.
Thom, A. S., Stewart, J. B., Oliver, H. R., and Gash, J. H. C.: 1975, ‘Comparison of Aerodynamic and Energy Budget Estimates of Fluxes over a Pine Forest’, Quart. J. R. Meteorol. Soc. 101, 93–105.
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Work carried out while on study leave at the Institute of Hydrology under CNPq financial support.
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Molion, L.C.B., Moore, C.J. Estimating the zero-plane displacement for tall vegetation using a mass conservation method. Boundary-Layer Meteorol 26, 115–125 (1983). https://doi.org/10.1007/BF00121537
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DOI: https://doi.org/10.1007/BF00121537