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- W4229967863 abstract "In order to make clear the effects of decreasing wind speed and the flow rectification and the horizontal variations of turbulent characteristics by a windbreak net (height 0.50m, length 50m and net density 50%), the observation was carried out at the micrometeorological observation grassland with two sets of three-dimensional ultrasonic anemometer, in the case that the wind direction was varied against the net.The main results were obtained as follows:(1) With increase in the incident angle (IA) of wind against the net, the horizontal distribution of relative wind speed downwind of the net indicated a pattern of V character type, and the recovery distance of wind speed in the oblique winds became shorter than that in the orthogonal incident winds in terms of orthogonal direction from the net. On the other hand, the wind recovery distance is constant in terms of the oblique distance in parallel with the wind direction.(2) Although the minimum of relative wind speed and its appearance point with the increment of the incident angle seem to increase and to move toward the net, respectively, those changing rates were small. The reasons could be that the decrease in wind speed by an apparent increase of the net density due to the oblique incidence, was counterbalanced by fluttering of the net and the effects of wind blowing with parallel to the net and jumping over the net, or the observation error.(3) The maximum of the downward wind decreased with the increasing incident wind angle, and the appearance point of the maximum moved toward the net, but its distance from the net was same in terms of the distance in the direction of wind.(4) With the diminution of the attack angle, the maximum of turbulent intensity increased at the windward region and decreased in the leeward. The maximum point moved toward the net, although the distance from the net measured in the wind direction was independent of the incident angle.(5) The maxima and minima of the skewness, kurtosis, turbulent diffusion coefficient and scale of the smallest eddy became nearer to the net with the increment of the incident angle, nevertheless, the distance measured in the direction of wind was not affected.(6) The maxima of energy dissipation rate and normalized peak frequency of the power spectral density increased in the windward from the net and decreased in the leeward with the decrease of the attack angle in an analogous manner to the turbulent intensity. The recovery distance of turbulent characteristics after the net was reduced, but it was not dependent on the incident wind angle, when the distance was measured in the direction of wind." @default.
- W4229967863 created "2022-05-11" @default.
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- W4229967863 date "1985-01-01" @default.
- W4229967863 modified "2023-10-17" @default.
- W4229967863 title "Studies on the Windbreak Nets" @default.
- W4229967863 doi "https://doi.org/10.2480/agrmet.41.223" @default.
- W4229967863 hasPublicationYear "1985" @default.
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