VOLNA-3 SODAR MEASUREMENTS OF MOMENTS OF WIND VELOCITY FIELD AND ESTIMATES OF MEASUREMENT ERRORS

摘要

The algorithms for determining the first four moments, their standard deviations, asymmetry and excess coefficients of wind velocity components (radial V_r and orthogonal V_(ort) components, absolute value of the horizontal wind V_h and its direction Φ by the Volna-3 sodar are described. The quality of estimation of these moments heavily depends on the quality of sodar measurements of instantaneous radial components V_r(ⅰ) and the accuracy of determination of their centers of distribution. So, to reject possible anomalous values, the corresponding procedure of iteration censorship of data is applied to V_r(ⅰ) with the further use of the adaptive averaging procedure. For the V_(ort), V_h, and Φ two methods of estimation are considered. The first method is based on calculation of their instantaneous values, and the further processing of V_(ort) and V_h components is similar to that of the radial components V_r. The moments of Φ are obtained using statistical methods. The second method is based on the use of pre-calculated moments of V_r and their additional statistical characteristics. To objectively estimate the degree of certainty of the obtained information, the point (standard errors) and interval (90% confidence intervals) estimates of random measurement errors are calculated.