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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Geoscience Letters Cover Image

Table 1 Configuration of the flows over hypothetical urban areas in wind tunnel experiments and LES

From: Parameterization of vertical dispersion coefficient over idealized rough surfaces in isothermal conditions

  Wind tunnel experiments LES
W-AL W-AH W-BL W-BH W-CL W-CH W-DL W-DH M-A M-B M-C M-D M-E
AR (= h/b) 1/2 1/4 1/8 1/12 1 1/2 1/3 1/5 1/11
Rib [×103 m]
 h 19    1   
 b 38 76 152 228 1 2 3 5 11
δ [m] 0.240 0.245 0.260 0.265 0.285 0.265 0.260    11   
δ/h 12.6 12.9 13.7 14.0 15.0 14.0 13.7    11   
U [m s−1] 3.28 6.66 3.31 6.61 3.28 6.70 3.29 6.60 1.01 0.81 0.65 0.58 0.56
Um [m s−1] 2.92 5.91 2.99 5.95 2.84 5.88 2.91 5.85 0.86 0.66 0.51 0.43 0.41
uτ [m s−1] 0.18 0.38 0.22 0.45 0.22 0.47 0.22 0.47    0.047   
uτ/U [×10−3] 56 57 65 68 68 71 68 71 0.046 0.058 0.072 0.081 0.085
uτ/Um [×10−3] 63 65 72 76 78 81 77 80 0.055 0.071 0.092 0.11 0.11
f [×10−3] (= 2u τ 2 /U 2 ) 8.0 8.3 10.4 11.4 12.2 13.0 11.9 12.8 4.3 6.7 10.3 13.2 14.3
Reδ [×103] (= Uδ/ν) 79 163 86 175 93 191 87 172 111 89 72 63 61
Reh [×103] (= Uh/ν) 6 13 6 13 6 13 6 13 10 8 7 6 6
Rem [×103] (= Umh/ν) 6 11 6 11 5 11 6 11 9 7 5 4 4
Reτ (= uτh/ν) 350 726 409 854 422 900 426 889    469