The measurement of waves, has been one difficult problem in observing the wave climate offshore. A crucial element in the development of any numerical model is its validation. Suitable measuring methods could be an ADP - Acoustic Doppler Profiler, a directional buoy, an array of pressuresensors, an ultrasonic device or an echo-sounder. Because of the resulting physical effects which may influence the wave measurement it is important to know how the applied device work. Due to the attenuation of the wave induced pressure signal with depth pressure-based underwater measurements have to be done with a sensor of suited effective range. In this regard the selected installation depth of the sensor or the sensor array is of great importance - the number of the pressure sensors in one array determines the directional resolution of the wave measurement. Direct measurements with movable devices such as a buoy are affected by unwanted acceleration signals as a result of the movement of the water surface. Especially when dealing with wave parameters like the Significant Wave Height (SWH) or the Wave Period. It is also fundamental to know whether the outputted signal is a real measured time series, e.g. the oscillation of the water surface (buoy) or a result of a spectral calculation (ADP). Even the mathematical methods behind the spectral results should be known exactly because little uncertainties there can cause great differences compared to a real-time measurement. Another important aspect is the definition of the measured parameter itself, e.g. the SWH.


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    Titel :

    Wave and current measurements for offshore windfarms


    Beteiligte:
    Bendfeld, Jörg (Autor:in) / Krieger, Jens (Autor:in) / Splett, Michael (Autor:in)


    Erscheinungsdatum :

    2010


    Format / Umfang :

    10 Seiten, 9 Bilder, 1 Tabelle, 14 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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