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On the theory of SODAR measurement techniques (final reporting on WP1, EU WISE project NNE5-2001-297)

Antoniou, I, Jorgensen, HE, Ormel, F, Bradley, SG, Von Hunerbein, S, Emeis, S and Warmbier, G 2003, On the theory of SODAR measurement techniques (final reporting on WP1, EU WISE project NNE5-2001-297) , Project Report, Riso National Laboratories, DK, Roskilde, Denmark.

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    Abstract

    The need for alternative means to measure the wind speed for wind energy purposes has increased with the increase of the size of wind turbines. The cost and the technical difficulties for performing wind speed measurements has also increased with the size of the wind turbines, since it is demanded that the wind speed has to be measured at the rotor center of the turbine and the size of both the rotor and the hub height have grown following the increase in the size of the wind turbines. The SODAR (SOund Detection And Ranging) is an alternative to the use of cup anemometers and offers the possibility of measuring both the wind speed distribution with height and the wind direction. At the same time the SODAR presents a number of serious drawbacks such as the low number of measurements per time period, the dependence of the ability to measure on the atmospheric conditions and the difficulty of measuring at higher wind speeds due to either background noise or the neutral condition of the atmosphere. Within the WISE project (EU project number NNE5-2001-297), a number of work packages have been defined in order to deal with the SODAR. The present report is the result of the work package 1. Within this package the objective has been to present and achieve the following: - An accurate theoretic model that describes all the relevant aspects of the interaction of the sound beam with the atmosphere in the level of detail needed for wind energy applications. - Understanding of dependence of SODAR performance on hard- and software configuration. - Quantification of principal difference between SODAR wind measurement and wind speed measurements with cup anemometers with regard to power performance measurements. The work associated to the above is described in the work program as follows: a) Draw up an accurate model of the theoretic background of the SODAR. The necessary depth is reached when the influences of various variables in the model on the accuracy of the measurement have been assessed. b) Describe the general algorithm SODAR uses for sending the beam and measuring the reflections. Describe the influence of various settings on the working of the algorithm. c) Using the data set from work package two analyse the differences between point measurements and profile measurements. All the above issues are addressed in the following report

    Item Type: Monograph (Project Report)
    Themes: Subjects / Themes > Q Science > QC Physics > QC221-246 Acoustics - Sound
    Subjects / Themes > Q Science > QC Physics > QC851-999 Meteorology - Climatology
    Subjects outside of the University Themes
    Schools: Colleges and Schools > College of Science & Technology
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Acoustics Research Centre
    Publisher: Riso National Laboratories, DK
    Depositing User: SUM Von-Hunerbein
    Date Deposited: 19 Aug 2010 14:17
    Last Modified: 20 Aug 2013 17:20
    URI: http://usir.salford.ac.uk/id/eprint/9588

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