FIELD MEASUREMENTS OF SHEET FLOW SEDIMENT TRANSPORT IN THE SWASH ZONE

Proceedings of the International Conference on Coastal Engineering

Ian Turner²  Chris Blenkinsopp²  Daniel Conley³  Jack A. Puleo¹  Paul Russell³  Gerd Masselink³  Thijs Lanckriet¹ 

[1] University of Delaware;University of New South Wales;Plymouth University

关键词: Swash zone;    sheet flow;    sediment transport;   

DOI  :  10.9753/icce.v33.sediment.78

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

A newly developed Conductivity Concentration Profiler (CCP), capable of rendering a 29-point sediment concentration profile at 1 mm vertical resolution, was deployed on a macrotidal beach in Perranporth, UK, as part of a comprehensive field study on swash zone hydrodynamics and sediment transport. Initial field results show the occurrence of sheet flow during both the uprush and backwash phases of the swash cycle. Concentration profiles in the sheet flow layer are approximately linear, with a power-law tail at the top of the layer. The data suggest that shear stresses are the dominant forcing for sediment mobilization, but pressure gradients provide a secondary mobilization mechanism.

【 授权许可】

Unknown