BED SHEAR STRESS MEAUREMENTS OVER ROUGH FIXED AND MOBILE SEDIMENT BEDS IN SWASH FLOWS

Proceedings of the International Conference on Coastal Engineering

Zhonglian Jiang¹  Tom Baldock¹ 

[1] School of Civil Engineering, The University of Queensland

关键词: Bed shear stress;    shear plate;    fixed and mobile beds;    dam break;   

DOI  :  10.9753/icce.v34.currents.40

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Direct measurements of bed shear stress have been conducted over rough fixed and mobile sediment beds in dam- break driven swash flows. The comparison between rough fixed and mobile bed results indicated the significant importance of grain borne shear stress component, induced by increased dispersive stress and the momentum transfer by moving sediment grains to the bed. The increase of the averaged peak bed shear stress under mobile sediment beds can be up to 100% of that for fixed beds. The direct incorporation of the shear stress data into the classic Meyer- Peter&Muller (1948) bed load model leads to over-estimate of bed load transport rate and reveals the fact of starved bed conditions applied in the present experiments.

【 授权许可】

Unknown