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• W2317021812 abstract "In order to make clear the dependencies of parameters Z0 and d in the wind profile equation on wind velocity, some measurements over a sorgo canopy were carried out in Fukuoka Prefecture in 1-30August 1967, at the several different growth stages of sorgo plants, i.e., (I) August 1-5, (II) August 15-20 and (III) August 28-29.A fairly wide range of values both of the roughness length (Z0) and of the zero-plane displacement (d) were obtained from the log-profile analyses. The relationships of both Z0 vs. u4 (wind velocity at 4m height above the ground) and d vs. u4 were examined for each period. We found a decrease in d and an increase in Z0 with the increase in the wind velocity. These results are in good agreement with those of reported by UDACAWA (1966) with the barley fields. However, complicated changes in d and Z0 for rice fields such as obtained by TANI (1960) were not found by present authors. Furthermore, the relation between d, Z0 and H are analysed in the light of TAKEDA's theory (K. TAKEDA (1966)), where H is an effective plant height defined by the following equation:1/H-dlnH-d/Z0=K2/αH.Plotting the values of d and Z0 on the rough surface diagram introduced by TAKEDA, a curved line segment is obtained which shows variations of d, Z0 and H in the course of a day. Also the place of the segment itself in the diagram changes with the development of the canopy. The change in the canopy structure or in the aerodynamical characteristics of the canopy surface seems to reflect in the values of Z0 and d. Thus, it is shown that Z0 increases with the growth, especially after heading. On the other hand, it is shown that d increases before heading, and then that after heading it decreases slightly, even though the plant height becomes continuously larger.If we plot d and Z0 against the friction velocity u*, similar relations with those of d vs. u4 and Z0 vs. u4 are obtained. Moreover, the effective plant hight H decreases with the increase in the friction velocity u*, which is expected in TAKEDA's theory. Hence it may be concluded that the theory is appropriate also in this case of the sorgo canopy." @default.
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• W2317021812 date "1968-01-01" @default.
• W2317021812 modified "2023-10-16" @default.
• W2317021812 title "On Zero-plane Displacement and Roughness Length in the Wind Profile over a Sorgo Canopy" @default.
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• W2317021812 doi "https://doi.org/10.2480/agrmet.24.127" @default.
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