Abstract
Recently, various coastal conservation measures based on comprehensive sediment control have been conducted, there are however many unkown phenomena in sediment transport and deposition around river mouth under flood condition. In this study, a series of hydraulic model experiments on turbidity current were carried out in order to grasp the behavior and deposition characteristics of the turbidity current. We applied the theoretical formula proposed by Hirano and Hatano to both salinity and turbidity currents. Experimental results showed that factors influencing turbidity current behavior include (1) resistance by scattering of fine particles, (2) density change due to sediment deposition, (3) tip velocity at the depth where most coarse particles deposit. The theoretical formula showed good agreement in tip velocity with both the salinity current and the turbidity current considering decrease in density by deposition.
