Comparisons between sediment transport models and observations made in wave and current flows above plane beds

被引:55
作者
Davies, AG
Ribberink, JS
Temperville, A
Zyserman, JA
机构
[1] DELFT HYDRAUL, NL-8300 AD EMMELOORD, NETHERLANDS
[2] INST MECAN GRENOBLE, F-38041 GRENOBLE, FRANCE
[3] DANISH HYDRAUL INST, DK-2970 HORSHOLM, DENMARK
关键词
comparison of models; current flows; plane beds; sediment transport models; transport models; wave flows;
D O I
10.1016/S0378-3839(97)00005-7
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
As a part of the MAST2 G8-M Coastal Morphodynamics project, the predictions of four sediment transport models have been compared with detailed laboratory data sets obtained in the bottom boundary layer beneath regular waves, asymmetrical waves, and regular waves superimposed co-linearly on a current, Each data set was obtained in plane bed, sheet flow, conditions and each of the four untuned numerical models has provided a one-dimensional vertical (1DV), time-varying, representation of the various experimental situations. Comparisons have been made between the model predictions and measurements of both time-dependent sediment concentration, and also wave-averaged horizontal velocity and concentration. For the asymmetrical waves and for the combined wave-current flows, comparisons have been made with vertical profiles of the cycle-averaged sediment flux, and also with the vertically-integrated net sediment transport rate. Each of the turbulence diffusion models gives an accurate estimate of the net transport rate (invariably well within a factor of 2 of the measured value). In contrast, none of the models provides a good detailed description of the time-dependent suspended sediment concentration, due mainly to the inability of conventional turbulence diffusion schemes to represent the entrainment of sediment into suspension by convective events at flow reversal. However, in the cases considered here, this has not seriously affected the model predictions of the net sediment flux, due to the dominance of the near-bed transport. The comparisons in this paper are aimed not only at testing the predictive capability of existing sediment transport modelling schemes, but also at highlighting some of their deficiencies.
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页码:163 / 198
页数:36
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