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Hydrodynamics of the Rhine ROFI near IJmuiden
Nauw, J.J.; van der Vegt, M. (2012). Hydrodynamics of the Rhine ROFI near IJmuiden, in: Kranenburg, W.M. et al. Jubilee Conference Proceedings NCK-days 2012 : crossing borders in coastal research. pp. 167-172. dx.doi.org/10.3990/2.191
In: Kranenburg, W.M. et al. (2012). Jubilee Conference Proceedings NCK-days 2012 : crossing borders in coastal research. [S.n.]: [s.l.]. ISBN 9789036533423. 256 pp., meer

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  • Nauw, J.J., meer
  • van der Vegt, M.

Abstract
    The paper will focus on hydrodynamics of the Rhine ROFI in its most northerly extent near IJmuiden. A bottom-mounted ADCPwas deployed near IJmuiden and measured for almost 6 months. Observations show that the largest difference in ellipticity betweensurface and bottom mostly occurred during neap tide, suggesting that the water column was stratified, leading to a cross-shorecirculation. However, for 3 out of the 11 neap tides no ellipticity difference was observed and during 1 out of the 10 spring tides astrong ellipticity difference occurred. To understand the causes of these irregularities a model was set up with GOTM. Based on thedepth-averaged currents the barotropic pressure gradient is determined. Using a simple advection equation the salinity profile wasestimated at the measurement location and used as input for the model. We were able to simulate the overall characteristics of theobserved flow patterns. Model results show a strong link between wind stress magnitude and direction and reduced stratification duringlow energetic neap tides. An increased fresh water discharge was the cause for the strong ellipticity difference during spring tide. Thestrong effect of wind speed and direction on the onset of stratification of the Rhine ROFI has never been shown before. Furthermore,the results show that during the 150 days of observations the plume always reached IJmuiden.

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