PICK-UP RATE OF SUSPENDED SAND DUE TO TSUNAMI

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.