PICK-UP RATE OF SUSPENDED SAND DUE TO TSUNAMI

Takumi Yoshii, Masaaki Ikeno, Masafumi Matsuyama, Naoki Fujii

Abstract


The pick-up rate formula which can apply to wide-range of grain size was presented through dimensional analysis and laboratory experiments. The result of the dimensional analysis revealed that there are three must-considered non-dimensional parameters: “non-dimensional sand grain diameter”, “non-dimensional settling velocity”, and “non-dimensional shear stress”. The pick-up rate formula which considers these parameters can predict the pick-up rate of 0.08 mm and 0.2 mm grains measured in the experiment with sufficient accuracy. The topography change around a harbor due to tsunami was measured in the laboratory experiment and compared with the result of numerical simulations. The numerical simulation with the presented pick-up rate formula shows a better agreement with the laboratory experiment than that with Takahashi et al. (2000)’s model.

Keywords


tsunami; sediment transport; pick-up rate

References


Asai, D., T. Takahashi and F. Imamura. 1999. Tsunami Sand Transport at Iruma Izu in the 1854 Tokai Earthquake, Proceedings of the Annual Conference in H10, Tohoku Branch of JSCE, pp.266-267.(in japanese)

Ashida, K. and M. Michiue. 1972. Study on hydraulic resistance and bed-load transport rate in alluvial streams, Proc. Japanese Society of Civil Engineers, No.206, pp.59-69. (in japanese)

Iwagaki, Y. 1956. (I) Hydrodynamical study on critical tractive force, Transaction of the Japanese Society of Civil Engineers, Vol. 41, pp.1-21. (in japanese)http://dx.doi.org/10.2208/jscej1949.1956.41_1

Kihara, N. and M. Matsuyama. 2010. Three-dimensional hydrostatic numerical simulations on tsunamiinduced sediment transport in a model harbor, Abstracts of the 3rd International Tsunami Field Symposium, p31-32.

Nishihata, T., Y. Tajima, T. Moriya and T. Sekimoto. 2006. Topography change due to the Dec 2004 Indian ocean tsunami - field and numerical study at Kirinda Port, Sri Lanka -, Proceedings of the 30th International Conference on Coastal Engineering, Vol. 2, pp. 1456-1468.

Rubey, W.W. 1933. Settling velocities of gravels, sand and silt particles, American Journal of Science, Vol. 25, pp.325-338. http://dx.doi.org/10.2475/ajs.s5-25.148.325

Sakakiyama, T., M. Matsuyama and T. Yoshii. Experimental Study on Bottom Topography Change in Harbor due to Tsunami, Proceedings of the 30th International Conference on Coastal Engineering. (in press)

Takahashi, T., N. Shuto, F. Imamura and D. Asai. 2000. Modelling sediment transport due to tsunamis with exchange rate between bed load layer and suspended load layer, Proceedings of InternationalConference on Coastal Engineering 2000, Vol.2, ASCE, pp.1508-1519.

Van Rijn, L.C. 1986. Mathematical modeling of suspended sediment in nonuniform flows, Journal of Hydraulic Engineering, Vol. 112, pp.433-455.http://dx.doi.org/10.1061/(ASCE)0733-9429(1986)112:6(433)

Yoshii, T, M. Ikeno and M. Matsuyama. 2009. Experimental study of sediment transport caused by tsunami, Proceedings of Coastal Dynamics 2009, Paper No. 32.


Full Text: PDF

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.