Variation Of Urban Momentum Roughness Length With Land Use In The Upwind Source Area,As Observed in Two U.K. Cities |
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| Authors: | G G Rooney I D Longley J F Barlow |
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| Institution: | (1) Met Office Field site, Cardington Airfield, Shortstown,Bedford, U.K., MK42 0SY;(2) Physics Department, University of Manchester Institute of Science and Technology (UMIST), Manchester, U.K., M60 1QD, P.O. Box 88;(3) Department of Meteorology, University of Reading, Earley Gate, P.O. Box 243, Reading, U.K., RG6 6BB |
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| Abstract: | The possibility of obtaining urban roughness length from satellite-derived maps of land cover is explored, using turbulence measurements taken above the urban canopy. The upwind land cover is identified using a source-area model. Firstly, from four sets of measurements taken in Birmingham (U.K.), it is shown that in an area mainly split between the land-cover types  urban and suburban, suburban cover in the upwind source area is the more important contributor to increasing measured roughness length. A smaller dataset obtained in a second U.K. city (Salford, Greater Manchester) shows a similar result. A roughness-length aggregation model is also applied to the data from both sites. This assigns values of roughness length to each of the land-cover classifications and uses the source-area model to predict the resultant roughness length based on the wind properties. The results from this are shown to agree with the earlier findings.The British Crowns right to retain a non-exclusive royalty-free license in and to any copyright is acknowledged |
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| Keywords: | land use source-area model urban meteorology |
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