| 单词 | surface roughness length |
| 释义 | > as lemmassurface roughness length roughness length n. [translating German Linearabmessung der Rauhigkeiten (L. Prandtl 1932, in Beiträge zur Physik der Atmosphäre 19 190] Meteorology a parameter used in representing the variation of horizontal wind speed with height immediately above the ground (or water surface), and typically corresponding to the unevenness of the surface; also surface roughness length. ΚΠ 1937 Q. Jrnl. Royal Meteorol. Soc. 63 105 z0 is the ‘roughness length’ of Prandtl. 1959 Adv. in Geophysics 35 48 The O'Neill terrain is short grass, with roughness length of about 0.7 cm. 1990 Sea: Ideas & Observ. IX. a. vii. 242 The wind excited air–sea interface may be anything from ultrasmooth to fully rough, having drag coefficients that may vary by an order of magnitude..and corresponding roughness lengths from 10−6 to 10 mm. 2008 Y. Shao Physics & Modelling Wind Erosion (ed. 2) iv. 109 Aerodynamic parameters, such as surface roughness length and zero-displacement height can be estimated from leaf-area index and vegetation height. < as lemmas |
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