Modeling of suspended sediment concentrations under combined wave-current flow over rippled bed SCIE SCOPUS

Cited 3 time in WEB OF SCIENCE Cited 3 time in Scopus
Title
Modeling of suspended sediment concentrations under combined wave-current flow over rippled bed
Author(s)
Lu, Jing; Wang, Xiao Hua; Babanin, Alexander V.; Aijaz, Saima; Sun, Younjong; Teng, Yong; Jung, Kyung-Tae; Qiao, Fangli
Publication Year
2017-12-05
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 (K-b) without ripples. However, the SSC is still underestimated by using previous schemes. Differently from the previous estimation of ripple-enhanced shear velocity U-*cwe, noted as (U-*cwe_NL, we introduce an U-*cwe improved by calculating through ripple-enhanced ripple-enhanced Kb, which is noted as U-*cwe_Kb. Simulation shows that U-*cwe_Kb produces significantly increased SSC under high wave conditions, resulting in reasonable agreements with the measurements. The wave friction factor f(w) is shown to play a crucial role in causing the difference between U-*cwe_Kb and U-*cwe_NL. (C) 2017 Elsevier Ltd. All rights reserved.
ISSN
0272-7714
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/1084
DOI
10.1016/j.ecss.2017.09.020
Bibliographic Citation
ESTUARINE COASTAL AND SHELF SCIENCE, v.199, pp.59 - 73, 2017
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Subject
YELLOW-RIVER SEDIMENT; BOUNDARY-LAYER; SHEET FLOW; TRANSPORT; DYNAMICS; SEA; RESUSPENSION; CIRCULATION; INITIATION; ROUGHNESS
Keywords
Ripples; Sediment transport; Roughness; Bottom shear velocity; Combined wave-current stress; Jervis Bay
Type
Article
Language
English
Document Type
Article
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
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