Momentum, heat and water vapour transfer to and from natural and artificial surfaces

Quarterly Journal of the Royal Meteorological Society - Tập 99 Số 422 - Trang 680-687 - 1973
J. R. Garratt1, B. B. Hicks1
1C.S.I.R.O. Division of Atmospheric Physics, Aspendale, Victoria, Australia

Tóm tắt

AbstractRecent atmospheric and wind tunnel data on the heat, mass and momentum transfer above natural and artificial surfaces indicate a general increase in the quantity kB−1 (= In(zo/zp), where zp is the roughness length appropriate to the quantity p) between aerodynamically smooth and fully rough flow. Below a roughness Reynolds number, u*zo/v, of about 100, kB−1 appears to be a single valued function of u*zo/v, closely approximated by the assumption of a molecular sub‐layer for heat and water vapour fluxes. Beyond u*zo/v = 100, there is no unique value of kB−1, but rather the observations suggest that the behaviour falls into either of two categories. For surfaces comprised of arrays of widely spaced solid roughness elements, kB−1 continues to increase (with some evidence for a plateau being reached by about u*zo/v = 1,000, when kB−1 ≃ 10), whilst for surfaces comprised of randomly distributed fibrous roughness elements, kB−1 gradually decreases with increasing roughness Reynolds number beyond about 100.

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Tài liệu tham khảo

10.1098/rspa.1966.0047

10.1002/qj.49709440108

10.1002/qj.49708135027

10.1002/qj.49708335811

10.1002/qj.49709641012

Graetz R. D.1972‘A micrometeorological study of the contributions of the individual elements of a community of plants to the momentum heat and vapour fluxes from that community as a whole ’ Ph.D. Thesis Australian National University Canberra 118pp.

Hicks B. B.1973a‘Eddy fluxes over a vineyard ’ submitted toAgric. Met.:

10.1007/BF02033919

10.1007/BF00821551

Hicks B. B. Hyson P. andMoore C. J.1973‘A study of eddy fluxes over a forest ’ in preparation.

10.1017/S0022112063000288

Schlichting H., 1955, Boundary layer theory

10.1002/qj.49708436102

1969, The Global Circulation of The Atmosphere, 91

Sheppard P. A., 1972, Studies of turbulence in the surface layer over water (Lough Neagh) I: Instrumentation, programme, profiles, Quart. J. R. Met. Soc., 98, 627

10.1002/qj.49709941913

Sutton O. G., 1953, Micrometeorology, 333

Sverdrup H. U., 1951, Evaporation from the oceans, 1,071

10.1002/qj.49709741404

10.1002/qj.49709841510

10.1002/qj.49709640708

10.1029/JB074i002p00444

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Quarterly Journal of the Royal Meteorological Society

Tập 99 Số 422

680-687

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