Hydrodynamics and Sediment Transport Under Solitary Waves in the Swash Zone

• Published in: Journal of marine science and engineering Vol. 12; no. 9; p. 1686
• Main Authors: Li, Shuo, Li, Wenxin, Shi, Huabin, Guan, Xiafei
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.09.2024
• Subjects: Analysis; Beach morphology; beach profile evolution; Beaches; Fluid dynamics; Fluid mechanics; Fluid motion; Friction; Hydrodynamics; Investigations; Morphology; Numerical analysis; Physical characteristics; Plumes; Sediment; sediment dynamics; Sediment transport; Sediment, Suspended; Smooth particle hydrodynamics; Solitary waves; Surf zone; Suspended sediments; swash–swash interaction; Transport phenomena; two-phase SPH model; Velocity; Viscosity; Vortices; Water; Wave breaking; Waves; Iran
• ISSN: 2077-1312; 2077-1312
• DOI: 10.3390/jmse12091686

Swash–swash interaction is a common natural phenomenon in the nearshore region, characterized by complex fluid motion. The characteristics of swash–swash interaction are crucial to sediment transport, subsequently affecting the beach morphology. This study investigates the hydrodynamics and sediment transport in swash–swash interaction under two successive solitary waves using a two-phase Smoothed Particle Hydrodynamics (SPH) model. The effects of the time interval between the two waves are examined. It is shown that the time interval has a minor effect on the breaking and swash–swash interacting patterns as well as the final beach morphology but influences the run-up of the second wave and the instantaneous sediment flux. Under wave breaking in the swash–swash interaction, there is significant sediment suspension due to strong vortices, and the suspended sediment forms a plume upward from the bed. The sediment plumes gradually settle down as the vortices decay. These insights enhance the understanding of sediment transport and beach morphology under complex swash–swash interaction.