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On the basis of the data of laboratory, model, and field investigation of the characteristics of a proposed cup anemometer, we obtain the following results: the distance constant is equal to 0.32 m with a mean-square deviation of 0.05 m, which is smaller than for the other anemometers of this type by an order of magnitude, the dynamic characteristics of the anemometer are linear for typical conditions of atmospheric turbulence, the variance and spectrum of noises (as a result of transformation of pulsed signals at the output of the anemometer) are described by universal functions with known parameters, the transmission bandwidth is approximately equal to 2 Hz for wind velocities lower than 5 m/sec and up to 5 Hz for higher wind velocities, and the errors of measurements of the mean wind velocity and the characteristics of the longitudinal component of velocity are approximately equal to 1 and 3%, respectively. The dimensions and weight of the anemometer are quite small, which enables one to perform long-term measurements of the characteristics of wind velocity for all types of platforms within broad ranges of hydrometeorological conditions. 相似文献
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A. V. Garmashov A. A. Kubryakov M. V. Shokurov S. V. Stanichny Yu. N. Toloknov A. I. Korovushkin 《Izvestiya Atmospheric and Oceanic Physics》2016,52(3):309-316
Wind-velocity data obtained from in situ measurements at the Golitsyno-4 marine stationary platform have been compared with QuikSCAT scatterometer data; NCEP, MERRA, and ERA-Interim global reanalyses and MM5 regional atmospheric reanalysis. In order to adjust wind velocity measured at a height of 37 m above the sea surface to a standard height of 10 m with stratification taken into account, the Monin–Obukhov theory and regional atmospheric reanalysis data are used. Data obtained with the QuikSCAT scatterometer most adequately describe the real variability of wind over the Black Sea. Errors in reanalysis data are not high either: the regression coefficient varies from 0.98 to 1.06, the rms deviation of the velocity amplitude varies from 1.90 to 2.24 m/s, and the rms deviation of the direction angle varies from 26° to 36°. Errors in determining the velocity and direction of wind depend on its amplitude: under weak winds (<3 m/s), the velocity of wind is overestimated and errors significantly increase in determining its direction; under strong winds (>12 m/s), its velocity is underestimated. The influence of these errors on both spatial and temporal estimates of the characteristics of wind over the Black Sea is briefly considered. 相似文献
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