Removing low-frequency artefacts from Datawell DWR-G4 wave buoy measurements
In this study we describe a previously unreported error in the vertical-displacement time series made with GPS-based Datawell DWR-G4 wave buoys and introduce a simple method to correct the resulting wave spectra. The artefact in the time series is found to resemble a sawtooth wave, which produces an...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-02-01
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| Series: | Geoscientific Instrumentation, Methods and Data Systems |
| Online Access: | http://www.geosci-instrum-method-data-syst.net/5/17/2016/gi-5-17-2016.pdf |
| Summary: | In this study we describe a previously unreported error in the
vertical-displacement time series made with GPS-based Datawell DWR-G4 wave buoys and
introduce a simple method to correct the resulting wave spectra. The artefact
in the time series is found to resemble a sawtooth wave, which produces an
erroneous trend following an <i>f</i><sup>−2</sup> power law in frequency space. The
correction method quantifies the amount of erroneous trend below a certain
maximum frequency and removes the spurious energy from all frequencies
assuming the above-mentioned <i>f</i><sup>−2</sup> power law. The presented correction
method is validated against an experimental field test, and its impact on the
measured significant wave height is quantified. The method's sensitivity to
the choice of the maximum frequency is also briefly discussed. |
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| ISSN: | 2193-0856 2193-0864 |