Comparison between predicted and observed large-scale sea bed features in the Southern North Sea


Hulscher, S.J.M.H. and Roelvink, J.A. (1997) Comparison between predicted and observed large-scale sea bed features in the Southern North Sea. [Report]

Abstract:The bottom of the Southern North Sea is partly covered by tidal sand banks and also partly covered with sand
waves; these two patterns can also overlap or both be absent. A theoretical morphodynamic approach has
provided a model which gives two physical parameters (Stokes number and resistance parameter) discriminating
between a flat bed, the growth of tidal sand banks, sand waves, both sand banks and sand waves and parallel
ridges. This paper reports whether this bed pattern model is able to make correct predictions in the Southern
North Sea. In order to judge the level of agreement both predictions as well as observations have to be treated at
an aggregated level, the level of patches of patterns. This leads to the results that the order of magnitude of the
predictions is correct, which means that for realistic values of the input parameters all types of observed patterns
are indeed predicted in the North Sea. The predictions show patchy behaviour of patterns, like observed. For the
major part of the observed patterns it has explicitly been shown that there are input parameters which are able
to predict the local correct pattern. The present study shows that the presence of bed patterns can be, in a global
way, predicted by the model. Due to the assumptions underlying this model this implies that the bed patterns in
the Southern North Sea can be explained as the res ult of long-term bed-tide interactions.
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Engineering Technology (CTW)
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