Kuo, C.A., Lai, J.W., Kuo, C.T. and Chien, C.H. 2007. Maximum run-up on the movable bed of uniform materials. Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 384 – 388. Gold Coast, Australia, ISSN 0749.0208
The characteristics of maximum run-up on the movable bed of various medium materials were investigated in this study. Six different medium diameters of uniform materials (D50= 0.15, 0.54, 1.02, 1.39, 2.68 and 4.84mm respectively) were used to construct the movable bed with a slope of 1/15 within the wave flume. In these experiments the topographical profile, wave shoaling and run-up were measured over various durations by generating irregular waves over 20 types of wave conditions. The effects of wave duration and medium diameter on the maximum run-up were initially analysed, with the results showing that under the same wave conditions the foreshore slope and maximum run-up on the movable bed would become steeper and higher with increasing wave duration before the topographical profile tended to stabilise. Hence, the varied profile of the movable bed should be measured at the various wave durations and used to estimate the height of maximum run-up. It is shown that the relative maximum run-up Rmax/Hs,o decreased as the medium diameter of the movable bed increased. Furthermore, considering the influence of roughness factor on the movable bed, a modified factor was led to MASE's empirical formula (1989) and was used to effectively estimate the maximum run-up on the movable bed.
