Atmospheric Turbulence in the Lowest Atmosphere (1st report)

[摘要] The structure pf wind was investigated at Onohara plain, Kashima Gun, Ibaragi Prefecture. Five hot wire anemometers were equipped to the wooden tower of 15 meters high. Their heights were about 1m, 3m, 5.5m, 10m, and 15m respectively from the ground. Fluctuations of wind were obtained from the record of electromagnetic oscillograph, and characters of u'-fluctuations, intensity of turbulence, scale of turbulence and eddy viscosity were calculated from the records. The intensity of turbulence_??_ is smaller than 0.2 above a height of 5m, and increases downwars. Scale of turbulence and eddy viscosity increases. upwards. Their magnitudes are about 4 meters and 2×104 cm2/sec at 10 meters height.

[学科分类] 大气科学