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A micrometeorological study of velocity profiles and surface drag in the region modified by a change in surface roughness
Abstract
This paper describes experiments in the lower atmosphere in which the wind passes from one surface to another with different roughness. Observations were made of the variation of surface stress, and of the development of velocity profiles in the region of flow modification over the downwind surface. Measurements are compared with the theories of Taylor, Elliot, and Panofsky and Townsend, and with the growth of a boundary layer on a flat plate. A large proportion of the surface stress adjustment occurs rapidly after the transition in agreement with Taylor's assumption. Velocity changes agree fairly well with the Panofsky and Townsend theory in the smooth‐rough direction, but not so well in the reverse. Growth of the modified region follows the 4/5 power law of boundary layer growth. It is concluded that the height/fetch criterion for a good micrometeorological site is about 1/200.
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Cited by
On the extension of the wind profile over homogeneous terrain beyond the surface boundary layer
Gryning, S.-E., Batchvarova, E., Brümmer, B., Jørgensen, H., & Larsen, S. (2007) · Boundary-Layer Meteorology · doi:10.1007/s10546-007-9166-9 · Cited by 406
Wind sheltering of a lake by a tree canopy or bluff topography
Markfort, C. D., Perez, A. L. S., Thill, J. W., Jaster, D. A., Porté‐Agel, F., & Stefan, H. G. (2010) · Water Resources Research · doi:10.1029/2009wr007759 · Cited by 123
Metadata
- Authors
- Bradley, E. F.
- Venue
- Quarterly Journal of the Royal Meteorological Society
- Publisher
- Wiley
- Published
- 1968-07
- Volume
- 94
- Issue
- 401
- Pages
- 361-379
- ISSN
- 0035-9009 (ISSN-L)
- 1477-870X
- OpenAlex
- W2110523114
- Cited by
- 291
- References
- 0
- FWCI
- 7.43
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: A micrometeorological study of velocity profiles and surface drag in the region modified by a change in surface roughness. https://app.cochat.ai/papers/10.1002/qj.49709440111
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- Bradley, E. F. (1968). A micrometeorological study of velocity profiles and surface drag in the region modified by a change in surface roughness. Quarterly Journal of the Royal Meteorological Society. https://doi.org/10.1002/qj.49709440111
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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
