Sand Transport in the Tidal Inlet between Wangerooge and Spiekeroog (W. Germany)

  1. S.-D. Nio,
  2. R. T. E. Shüttenhelm and
  3. Tj. C. E. Van Weering
  1. J. Hanisch

Published Online: 29 JUN 2009

DOI: 10.1002/9781444303759.ch13

Holocene Marine Sedimentation in the North Sea Basin

Holocene Marine Sedimentation in the North Sea Basin

How to Cite

Hanisch, J. (1981) Sand Transport in the Tidal Inlet between Wangerooge and Spiekeroog (W. Germany), in Holocene Marine Sedimentation in the North Sea Basin (eds S.-D. Nio, R. T. E. Shüttenhelm and Tj. C. E. Van Weering), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303759.ch13

Author Information

  1. Niedersächsisches Landesamt für Bodenforschung/Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 3000 Hannover 51, F.R.G., Germany

Publication History

  1. Published Online: 29 JUN 2009
  2. Published Print: 23 DEC 1981

ISBN Information

Print ISBN: 9780632008582

Online ISBN: 9781444303759

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Keywords:

  • sand transport model for tidal inlet;
  • an arc-shaped shoal (‘Riffbogen’);
  • sand transport between Wangerooge and Spiekeroog;
  • ‘relief peels’ prepared from cores;
  • encountered grain-size distribution

Summary

Based on the evaluation of transport directions and grain-size distributions, a new sand transport model for the tidal inlet between Wangerooge and Spiekeroog (northern Germany) is presented. Only sand with mean diameter > 180 μm forms megaripples and is transported at relatively high rates. The previously assumed shift of sandbars around an arc shaped shoal north of the inlet from west to east is refuted. Instead of this, there are numerous oscillations and internal circulations of the sand in the shoal area before it reaches the beach of Wangerooge. During calm weather periods the arcuate shoal is dominated by ebb-tide currents. Under these conditions it grows higher and widens. During surge conditions the shoal arc is flattened and reduced in radius.

The stability or non-stability of the inlet depends on the ratio of ebb-tide current erosion on the western flank of the inlet channel to the amount of sand accumulating there from the littoral drift. At present, the lack of a sufficient sand supply to the north-western beach of Wangerooge is caused mainly by a decrease of this erosion due to scouring of the Harle bottom at the end of a long groyne.