Turbulence Measurements at the Sea Coast during High Winds

[摘要] Turbulent properties of longitudinal wind velocities were studied from wind records observed in 150 m meteorological tower on the coast. It was recognized that the wind from the sea was inflenced by the terrain features near the tower and the magnitude of turbulent velocities increased with decreasing height. The effect of terrain roughness was found clearly on the intensity of turbulence, but was hardly noticed on the scale of turbulence. The low-frequency part of power spectrum was greatly influenced by unknown causes except terrain roughness, and a considerable discrepancy was noticed from one observation to another. It would be hard to represent whole power spectra by one simple algebraic expression. The discrepancy was less between vertical correlations than between longitudinal scales. It might be expected from vertical correlations between various heights that a vertical scale was increasing and phase of gusts was advancing with increasing height.

[学科分类] 大气科学