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KMID : 1024520140230061199
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Journal of the Environmental Sciences
2014 Volume.23 No. 6 p.1199 ~ p.1211
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Estimation of Atmospheric Turbulent Fluxes by the Bulk Transfer Method over Various Surface
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Kim Min-Seong
Kwon Byung-Hyuk
Kang Dong-Hwan
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Abstract
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The momentum flux and the sensible heat flux were measured with the scintillometers and ultrasonic anemometers
at 6 sites of which surface characteristics like roughness length and zero-displacement are different each other. We
estimated the momentum flux and the sensible heat flux based on the bulk transfer method with the drag coefficient
and the heat transfer coefficient calculated from the temperature and wind speed at two heights. The variation of bulk
transfer coefficients showed a remarkable difference depending on the atmospheric stability which is less influenced by
the zero-displacement than the roughness length. The estimated sensible heat fluxes were in good agreement with those
measured at 3 m, showing 23.7 Wm-2 of the root mean square error that is less than 10% of its maximum. Since the
estimated momentum flux is not only effected by drag coefficient but also by wind speed square, the determination of
wind speed in the bulk transfer method is critical.
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KEYWORD
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Drag coefficient, Heat transfer coefficient, Bulk transfer method, Turbulent fluxes, Scintillometers
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