Estimate of the aerodynamic roughness parameters over an incomplete canopy cover of cotton
1989
Kustas, William P. | Choudhury, B. J. (Bhaskar J) | Kunkel, Kenneth E. | Gay, Lloyd W.
Wind speed and temperature data at five levels were used to estimate the roughness length, z(om), and displacement height, d(o), for a sparsely covered cotton field with an average plant height of 32 cm and 1-m width furrows approximately 16 cm in depth. Five near-neutral cases produced an estimate of z(om) = 0.066 m (+/- 0.043) and d(o) = 0.31 m (+/- 0.20). In terms of obstacle height, h (i.e., furrows and plants), this yields z(om)/h approximately =0.14 and d(o)/h approximately =0.65. Confidence in the estimates of the roughness parameters was obtained with a comparison of the sensible heat flux, H, determined by K-theory relationships for gradients of wind speed and temperature in the surface layer and by measurements using the eddy correlation technique. The root mean square error was approximately 30 W m−2 between the two methods.
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