On the Fluctuation of the Vertical Component of Wind Velocity in the Air Layer near the Ground

[摘要] Some characteristics of hot wire direction-sensitive meter, consisting of two hot wires stretched at right angles, are discussed. It shows linear characteristics up to 30 degrees, and less than 10% erorr in the indication when the mean velocity changes from 5 to 14m/s, and also this erorr is compensated when used only in measurin the mean velocity. With this direction meter angle of inclination of wind velocity was recorded by a electromagnetic oscillograph at the plain of Kashima, Ibaragi Prefecture. On the same recording chart, velocity fluctuation along the mean flow was also recorded. So the vertical fluctuation of the vertical component can be obtained from them. Numerical values of _??_ at 1 and 3 meters above the ground are shown. The author also shows that the vertical component of turbulence is larger than the component along the mean stream not only in its intensity but also in its scale.

[学科分类] 大气科学