Abstract
Measurements of the eddy fluxes of momentum and of sensible heat over a vineyard at Griffith, N.S.W., show a strong influence of wind direction. The drag coefficient (referred to wind speeds at 1.5 m) increased from about 0.013 to 0.027 as the wind direction swung from parallel to normal to the vine rows. The corresponding bulk transfer coefficient for sensible heat showed a similar increase.When winds blow across the rows of vines, the roughness length is found to be about 13% of the crop height. In this situation, the data indicate that more of the available heat energy is being lost to the air via evaporation than when winds are along the crop rows.
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