PUMICE DEPOSITION IN THE SWASH ZONE USING MOT AND SPH METHOD

Abstract

 In recent years, pumice strandings have caused significant disruptions to coastal fisheries and maritime traffic, highlighting the need to better understand the transport and deposition processes of floating materials in swash zones. This study quantitatively investigated the behavior of pumice particles under waveinduced swash conditions using large-scale flume experiments and numerical simulations based on the Smoothed Particle Hydrodynamics (SPH) method. In the physical experiments, a modified Multi-Object Tracking technique(MOT) was applied to capture pumice trajectories, and the influence of bottom topography was evaluated using two-sample t-tests. The results showed that in concave areas, pumice velocity was significantly lower than in convex regions, with approximately five times more pumice particles stranding and a 0.83-fold shorter maximum run-up distance. Numerical simulations further revealed that particle behavior was strongly influenced by the number of pumice stones.