“Manning equation”的概念、定义、翻译、参考文献-科学参考

Manning equation

Geology and Earth Sciences

An equation that relates the velocity (V) of water flowing through a stream to the hydraulic radius of the stream (R), its slope (s), and an estimate of its bed roughness (n). V = (R^⅔s^½)/n. The equation was developed by the Irish engineer Robert Manning (1816–97) and its first version appeared in 1891 in Manning’s paper ‘On the flow of water in open channels and pipes’ (Transactions of the Institution of Civil Engineers of Ireland).
http://manning.sdsu.edu/ An account of Manning’s life and work.

Geography

Also known as the Mark–Manning formula, the Gauckler–Manning formula, or the Gauckler–Manning–Strickler formula, this is an empirical formula estimating open channel flow, or free-surface flow driven by gravity:
$V = \frac{k}{n} R_{h}^{2 / 3} S^{1 / 2}$
where V is the cross-sectional average velocity (L/T; ft/s, m/s); k is a conversion factor of (Length^1/3/Time), 1 m^1/3/s for SI, or 1.4859 ft^1/3/s U.S. customary units, if required. (Note: (1 m)^1/3/s = (3.2808399 ft) ^1/3/s = 1.4859 ft^1/3/s); n is the Manning coefficient, and is unitless; R_h is the hydraulic radius (L; ft, m); and S is the slope of the water surface or the linear hydraulic head loss (L/L) (S = h_f/L).

单词	Manning equation
释义	Manning equation Geology and Earth Sciences An equation that relates the velocity (V) of water flowing through a stream to the hydraulic radius of the stream (R), its slope (s), and an estimate of its bed roughness (n). V = (R^⅔s^½)/n. The equation was developed by the Irish engineer Robert Manning (1816–97) and its first version appeared in 1891 in Manning’s paper ‘On the flow of water in open channels and pipes’ (Transactions of the Institution of Civil Engineers of Ireland). http://manning.sdsu.edu/ An account of Manning’s life and work. Geography Also known as the Mark–Manning formula, the Gauckler–Manning formula, or the Gauckler–Manning–Strickler formula, this is an empirical formula estimating open channel flow, or free-surface flow driven by gravity: $V = \frac{k}{n} R_{h}^{2 / 3} S^{1 / 2}$ where V is the cross-sectional average velocity (L/T; ft/s, m/s); k is a conversion factor of (Length^1/3/Time), 1 m^1/3/s for SI, or 1.4859 ft^1/3/s U.S. customary units, if required. (Note: (1 m)^1/3/s = (3.2808399 ft) ^1/3/s = 1.4859 ft^1/3/s); n is the Manning coefficient, and is unitless; R_h is the hydraulic radius (L; ft, m); and S is the slope of the water surface or the linear hydraulic head loss (L/L) (S = h_f/L).
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