Abstract
When a windbreak is set up, the eddy occures in front and back of it. In order to know the volume of the eddy, the average wind velocity and the distance covered by the eddy before it vanishes the correlation coefficient of the turbulence is calculated as followsRT=Σ(VX′×VY′)/Σ(VX′2)Σ(VY′2)VX…the velocity of the Wind at X PointVX, VY…Mean Velocity at X and Y PointVX′=VX-VX VY′=VY-VYBelow 100cm height, the correlation of 3X/H is seen up to 8X/H, especially at 70cm to 10X/H, Above 150cm the correlation of 3X/H is large at each location. As to the correlation with the standard, it is not seen up to 8-10X/H. It is seen with 10X/H at 50cm and 8X/H at 150cm, respectively. If the time-correlation in 5 seconds is adopted for this eddy, the scale of the eddy is as followsL=RTU=5×(0.5-1.2)=2.5-6.0(m)RT…time CorrelationU…average Velocity of WindThe height of the eddy seems to be about 1.0-1.2 meters.
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