Abstract
Tsunami-induced local scouring around a movable inland structure on the sand bed is investigated using a three-dimensional coupled fluid-structure-sediment interaction model in terms of the displacement of the structure. From a comparison with experimental data, it is found that the water surface elevation and the bed profile change are predicted reasonably well regardless of the absence or presence of the drawdown. Moreover, the bed profile change at the seaward and landward side of the structure is less affected by whether the calculation of the motion of the structure is implemented in the model. However, it slightly affects local scouring around the seaward corner of the structure because the displacement of the structure changes the flow field around the structure. This suggests that it is essential to consistently calculate the motion of the structure when assessing local scouring around movable structures.
