4:30 PM - 4:45 PM
[HDS10-28] Numerical Experiment on Effect of Sand Grain Size and Wave Reflection for Tsunami Deposits Compared with Experimental Hydraulic Data
Keywords:Numerical experiment, Hydraulic experiment, Uniform sand, Mixed sand
To reproduce a more accurate distribution of sediment transport, Takahashi et al. (2011) proposed another model that focused on sand grain size. They carried out a hydraulic experiment using three types of sand and proposed different coefficients of motion equation depending on grain size. However, this model was limited to three grain sizes and specific flow conditions. Therefore, this current study calculated the Takahashi et al. (2011) model for various grain sizes and mixed sand conditions, and compared the results with the experimental hydraulic data of Yamamoto et al. (2017). In addition, we studied the effect of the cut-off wall that produces a reflected wave. The results showed that the amount of sand deposited generally corresponds with the hydraulic experiment, although the local-scale distribution differed in several places. The amount of sand deposits was underestimated near the shore. Conversely, the amount of sand deposits was overestimated near the run-up front. The sand deposit peak moved toward the run-up front compared with the hydraulic experiment.