TEST OF EMPIRICAL SEDIMENT TRANSPORT RELATIONS AGAINST EXPERIMENTAL SWASH DATA UNDER THE NON-CAPACITY MODELING FRAMEWORK
ICCE 2018 Cover Image
PDF

Supplementary Files

Conference Presentation File

How to Cite

Hu, P., Tan, L., Xie, J., & He, Z. (2018). TEST OF EMPIRICAL SEDIMENT TRANSPORT RELATIONS AGAINST EXPERIMENTAL SWASH DATA UNDER THE NON-CAPACITY MODELING FRAMEWORK. Coastal Engineering Proceedings, 1(36), sediment.81. https://doi.org/10.9753/icce.v36.sediment.81

Abstract

Swash sediment transport and beach deformation has received great attention in the past two decades. Quantification of swash-induced sediment transport rate is of vital importance for accurate prediction of beach deformation in the swash zone. Two empirical parameters are involved in this quantification, empirical relations for sediment transport capacity and the bed shear stress that may be used in the former. Since the swash zone is highly unsteady, of short cross-shore distance, sediment transport in this zone may be of high possibility to be lag of the flow variation. Thus we have firstly developed a non-capacity sediment transport model for the swash zone. This model appreciates the fact that the actual sediment transport rate may not be necessarily equal to the sediment transport capacity of the flow. In contrast to traditional capacity models that calculate sediment transport rate using directly empirical relations (Hu et al. 2015), the non-capacity model uses the advection-diffusion equation to calculate depth-averaged sediment concentration firstly, and afterwards compute sediment transport rate as flow depth*velocity*concentration. We have also noted that some empirical relations for sediment transport capacity may predict physically unrealistic high values of sediment concentration in the swash zone. This is attributed to the vanishing water depth in the swash zone, whereas existing empirical relations are developed for relatively large water depths (Hu et al. 2015; Li et al. 2017).
https://doi.org/10.9753/icce.v36.sediment.81
PDF

References

Hu, P., Li, W., He, Z., Paehtz, T., and Yue, Z. (2015). Well-balanced and flexible modelling of swash hydrodynamics and sediment transport. Coastal Engineering, ELSEVIER, VOL.96, PP 27-37.

Li, W., Hu, P., Pahtz, T., He, Z., and Cao, Z. (2017). Limitations of empirical sediment transport formulas for shallow water and their consequences for swash zone modeling. Journal of Hydraulic Research, IAHR, vol. 55, pp 114-120.

Wilcock, P. R. (1996). Estimating local bed shear stress from velocity observations. Water Resources Research, 32, 3361-3366.

O'Donoghue, T., Kikkert, G. A., Pokrajac, D., Dodd, N., and Briganti, R. (2016). Intra-swash hydrodynamics and sediment flux for dam-break swash on coarsegrained beaches. Coastal Engineering, 112, 113- 130.

Kikkert, G. A., O'Donoghue, T., Pokrajac, D., and Dodd, N. (2012). Experimental study of bore-driven swash hydrodynamics on impermeable rough slopes. Coastal Engineering, 60, 149-166.

Mrokowska, M. M., Rowinski, P. M., and Kalinowska, M. B. (2015). Evaluation of friction velocity in unsteady flow experiments. Journal of Hydraulic Research, 53(5), 659-669.

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.