Abstract
This study focuses on the impact of debris-flow interactions on the inundation characteristics around the nearshore area. Laboratory experiment was first carried out to investigate the behavior of cubic wooden chips placed on the inundated area. Image-based analysis was applied to extract the quantitative characteristics of inundating flow and behavior of wooden chips. Numerical model was developed based on non-linear shallow water equations with dispersive terms. Behavior of each wooden chip was computed based on the equation of motion with hydrodynamic forces specified by Morison's equations. Influence of wooden chips on the inundating flow was accounted for in the momentum equation by adding the force acting on the chip as a reaction force and increase of hydrostatic pressure due to floating debris. The developed mode reasonably represented the observed behavior of floating wooden chips and the validated model was further applied to investigate the characteristics of flow-debris interacting fields.
