Analysis of Meteorological Data and Main Problems Related to the Determination of Building Exposure

Abstract

The main objective of the study is to transfer meteorological data from the meteorological station site to the site of a construction. A special methodology must be developed in order to obtain sets of data corrected from the measurement errors, due to several influences such as the support of the measuring instruments. This methodology must also take into account the particularly complex topography typical of Switzerland. Thus it is necessary to determine the influence of nearby obstacles, ground roughness, topography on the measurement of the wind speed and direction.

In this paper, first of all, are presented the problems posed by the measurement of the wind velocity in the lower layers of the atmosphere and the necessity to have conceptual models for the measured phenomena as well as to know how the measurements are made.

The description of the correction method of the parasitic influences on the measurements of the stations of the Swiss meteorological network ANETZ is presented.

The result of wind tunnel testing of the topographic influence on the measurements and calculation examples of the ground roughness and space validity on the measurements are included.

Finally a description of the corrections algorithm and of the data transfer technique will be given.