MORPHOLOGICAL MODELLING OF ARTIFICIAL SAND RIDGE NEAR HOEK VAN HOLLAND, THE NETHERLANDS

摘要

The study is focussed on the morphological modelling (based on DELFT3D model) of an artificial sand rige at the Dutch shoreface near Hoek van Holland close to the harbour of Rotterdam. The ridge is perpendicular to the coast and to the tidal flow. The sediment size is about 0.3 mm. The tidal range is about 2 m. The peak flood velocities (to north) and ebb velocities (to south) are about 0.6 and 0.55 m/s. Using a 1DH (depth-averaged) model approach, the growth and migration of a sand ridge can not be simulated properly as the modification of the velocity profiles can not be represented. This latter effect can only be simulated by using a 2DV (two-dimensional vertical) or a 3D model approach. Growth of the sand ridge can occur when bed-load transport is dominant. Decay (flattening) of the ridge occurs when suspended load transport is dominant, particularly when waves are important.