Influence of group-bounded long wave on sediment transport rate
- 97 Downloads
The formula predicting the sediment transport rate induced by the interactions between short waves and group-bounded long wave is mathematically derived using Bailard's immersed weight sediment transport rate formula and the expansion of flow moments. As the first step for studying the influence of group-bounded long wave on the sediment transport rate, a regular wave groups which may be easily generated by the linear combination of monochromatic waves is used. From the numerical experiments, it is found that the group-bounded long wave plays an important role in the bottom sediment transport mechanism under wave groups. In particular, the group-bounded long wave tends to move the bottom sediment toward the direction of down slope or offshore. Also, the suspended load is more affected than the bed load by the group-bounded long wave. These are consistent with the field data which wave groups results in higher concentrations of suspended sand.
KeywordsGroup-bounded long wave Sediment transport rate Regular wave groups Bed load Suspended load
Unable to display preview. Download preview PDF.
- 1.Bagnold, R.A. (1966). “An approach to the sediment transport problem from general physics,”U.S. Geological Survey Professional Paper, 422–1.Google Scholar
- 3.Bowen, A.J. (1980). “Simple models of nearshore sedimentation; Beach profiles and longshore bars,”Geophysical Survey of Canada, Pap. 80–10, pp. 1–11.Google Scholar
- 4.Creed, C.G., Dalrymple, R.A. Kriebel, D.L. and Kaihatu, J.M. (1992). “Equilibrium beach profiles with random seas,”Proceedings of 23rd International Conference of Coastal Engineering, ASCE, pp. 1973–1986.Google Scholar
- 5.Dean, R.G., and Dalrymple, R.A. (1984).Water wave mechanics for engineers and scientists, Prentice-Hall.Google Scholar
- 10.Sand, S.E., (1982). “Long wave problems in laboratory models,“Journal of Waterway, Port, Coastal and Ocean Division, ASCE, Vol. 108, No. WW4, pp. 492–503.Google Scholar
- 12.Sternberg, R.W., Shi, N.C. and Downing, J.P. (1989). “Continuous measurements of suspended sediment,”Nearshore Sediment Transport, edited by Seymour, pp. 231–257.Google Scholar
- 13.Wise, R.A., N. Kobayashi, and Wurjanto, A. (1991). “Cross-shore sediment transport under irregular waves in surf zones,”Coastal Sediments '91, ASCE, pp. 658–673.Google Scholar