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On geometric and statistical selfsimilarity in wind direction in turbulent atmosphere

Chanda A.

Journal of Technical Physics

1998

Vol. 39, no 2

237-243

Direction of wind, the horizontal component of air velocity is assumed to form a fractal set. Higher above ground, wind becomes stronger are more unidirectional and hence the direction data are less random, what leads to lowering of its fractal dimension (FD). FD of wind direction data, measured a meteorological tower at different altitudes have been estimated. The conjecture as above has been tested by means of the estimated FD and the mean wind of the given data. In addition, intermittency behaviour of the data set and its depedence upon the distance from ground have been examined by calculating the correlation dimension. Is has been observed that intermittency is more near the ground. This observation is inconformity with the findings of Chilla et al. [1] in a laboratory experiment, and also with the recent findings of Chanda et al. [2] in a meteorological experiment.