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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 7
Hydrol. Earth Syst. Sci., 18, 2599–2613, 2014
https://doi.org/10.5194/hess-18-2599-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 18, 2599–2613, 2014
https://doi.org/10.5194/hess-18-2599-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 11 Jul 2014

Research article | 11 Jul 2014

Determining slack tide with a GPS receiver on an anchored buoy

M. Valk1,2, H. H. G. Savenije1, C. C. J. M. Tiberius1, and W. M. J. Luxemburg1 M. Valk et al.
  • 1Delft University of Technology, Delft, the Netherlands
  • 2Seaway Heavy Lifting Engineering, Zoetermeer, the Netherlands

Abstract. In this paper we present a novel method to determine the time of occurrence of tidal slack with a GPS receiver mounted on an anchored buoy commonly used to delineate shipping lanes in estuaries and tidal channels. Slack tide occurs when the tide changes direction from ebb to flood flow or from flood to ebb. The determination of this point in time is not only useful for shipping and salvaging, it is also important information for calibrating tidal models, for determining the maximum salt intrusion and for the further refinement of the theory on tidal propagation. The accuracy of the timing is well within 10 min and the method – able to operate in real time – is relatively cheap and easy to implement on a permanent basis or in short field campaigns.

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