Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8885158 | Estuarine, Coastal and Shelf Science | 2017 | 47 Pages |
Abstract
Ripples appear and disappear dynamically on coastal bed. The bottom stress can significantly be enhanced when ripples appear, and then the sediment transport will be influenced by the ripple-enhanced stress. However, ripples' impact on suspended sediments is seldom discussed. In this study, a bedform (ripples) module based on combined wave and current flow is coupled with a bottom boundary layer (BBL) model. This BBL model outputs our improved bottom shear stress (BSS) to both the sediment model (UNSW-sed) and the hydrodynamic model (POM). Model results in Jervis Bay of Australia show that the simulated suspended sediment concentration (SSC) of an abrupt rising is significantly improved by considering ripples rather than setting a uniform roughness (Kb) without ripples. However, the SSC is still underestimated by using previous schemes. Differently from the previous estimation of ripple-enhanced shear velocity Uâcwe, noted as Uâcwe_NL, we introduce an Uâcwe improved by calculating through ripple-enhanced ripple-enhanced Kb, which is noted as Uâcwe_Kb. Simulation shows that Uâcwe_Kb produces significantly increased SSC under high wave conditions, resulting in reasonable agreements with the measurements. The wave friction factor fw is shown to play a crucial role in causing the difference between Uâcwe_Kb and Uâcwe_NL.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geology
Authors
Jing Lu, Xiao Hua Wang, Alexander V. Babanin, Saima Aijaz, Younjong Sun, Yong Teng, Kyung-Tae Jung, Fangli Qiao,