Primary profile bioturbation and macro fauna as indices of sand transport in the coastal region off norderney north sea part 1 zonation of primary profiles and bioturbation

Reineck, H.E.

Senckenbergiana Maritima 8(4-6): 155-169


ISSN/ISBN: 0080-889X
Accession: 006184323

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Box cores and can cores were sampled along a profile running from the 20 m depth contour to the low water line of the barrier island Norderney (North Sea). Four zones showing an increasing degree of bioturbation and a decreasing rate of sediment transport with increasing water depth were differentiated. Zone I, located between the low water line and the 1.2 m depth contour, covers the uppermost bar and runnel of the shoreface. It is characterized by coarse grained sediments, proportional high degree of crossbedded megaripples, and low degree of bioturbation. Sediment reworking occurs constantly. In Zone II, located between the 1.2 and 3.0 m depth contours, the sediment textures are finer than in zone I. It covers the 2nd bar and runnel of the shoreface. During calm weather no sediment transport occurs. Zone III is located between the 3.0 and 7.5 m depth contours. The sand is proportionally finer and the degree of bioturbation higher than in the zones of less water depths. In Zone IV located between the 7.5 and 20 m depth contours the median size of sand increases due to the reworking process of Pleistocene relict sediments. Crossbedding of megaripples is common; however, the high degree of bioturbation shows that the transport of sediment occurs only sporadically during heavy storms mainly in wintertime. Zones I, III and IV are inhabited by macrobenthic communities.