MODELLING DYNAMIC BED ROUGHNESS ASSOCIATED WITH BED FORM DEVELOPMENT
In this study bed form development was quantified and used to calculate a dynamic bed roughness parameter. An algorithm that can be readily implemented into numerical models was developed and evaluated for two scenarios, with distinct flow conditions and sediment carrying capacities. The final bed form height and length and the time for their occurrence were used in an existing bed form development model, which gave the time-dependent ripple dimensions and bed roughness parameters. A good agreement was achieved between measured and predicted results. The variation of the bed roughness, as observed from the flat bed state to the final stage of ripple development, spanned 2 orders of magnitude, irrespective of the flow and sediment transport conditions considered. Implementation of the dynamic bed roughness calculation procedure included herein in numerical models can improve the representation of the sediment-water interface in modelling studies, when compared to the conventional approach based on a constant roughness parameter.
dynamic bed roughness sediment transport bed form hydraulic modeling non-uniform flow
WB Rauen B Lin RA Falconer
Hydro-environmental Research Centre, School of Engineering, Cardiff University,The Parade, Cardiff CF24 3AA, UK
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
865-870
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）