AN IDEALIZED MODEL OF TIDAL DYNAMICS IN SEMI-ENCLOSED BASINS: THE EFFECTS OF A MEGA-SCALE SAND EXTRACTION TRENCH IN THE NORTH SEA

Proceedings of the International Conference on Coastal Engineering

Pieter C Roos³  Suzanne J M H Hulscher³  Wiebe P de Boer¹  Ad Stolk² 

[1] Deltares;Rijkswaterstaat Noordzee;University of Twente

关键词: sand extraction;    semi-enclosed basins;    tidal dynamics;    North Sea;    Netherlands Continental Shelf;   

DOI  :  10.9753/icce.v32.currents.37

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

We investigate the effects of a mega-scale sand extraction trench (length ~200 km, width ~10 km, depth ~10 m, located in front of the Dutch coast) on tidal dynamics in the Southern North Sea. To this end, an idealized modeling approach is adopted, extending the classical problem of Kelvin wave reflection in rectangular semi-enclosed basins to account for lateral depth variations and the presence of a trench. The model results indicate changes in tidal range (zones of decrease and increase of the order of several cm), phase and currents (order cm/s) throughout the whole basin, which emphasizes the importance of a model domain on the scale of the basin. The changes in currents may structurally change sediment transport rates by several percents, which is relevant to coastal morphology. It is argued that this idealized model can be used to support a companion study carried out with a more detailed numerical engineering model. This is because of its ability to (1) provide insight into the physical mechanisms, (2) reveal the order of magnitude and area of influence of the effects and (3) allow for a quick sensitivity analysis with respect to trench geometry.

【 授权许可】

Unknown