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首页> 外文期刊>Estuarine Coastal and Shelf Science >Modeling of suspended sediment concentrations under combined wave-current flow over rippled bed
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Modeling of suspended sediment concentrations under combined wave-current flow over rippled bed

机译：波纹床组合波流作用下悬浮泥沙浓度的模拟

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摘要

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.
机译：波纹在沿海床上动态地出现和消失。当出现波纹时，底部应力会显着增强，然后，波纹增强应力会影响沉积物的迁移。但是，很少讨论涟漪对悬浮沉积物的影响。在这项研究中，基于波和电流组合的床形（波纹）模块与底部边界层（BBL）模型耦合。该BBL模型将我们改进的底部切应力（BSS）输出到沉积物模型（UNSW-sed）和流体动力模型（POM）。澳大利亚杰尔维斯湾的模型结果表明，通过考虑波动而不是设置没有波动的均匀粗糙度（K-b），可以显着提高突然上升的模拟悬浮泥沙浓度（SSC）。但是，通过使用以前的方案，SSC仍然被低估了。与先前对波纹增强的剪切速度U- * cwe的估计不同（记为（U- * cwe_NL），我们引入了通过对波纹增强的波纹增强Kb进行计算而改进的U- * cwe，记为U- * cwe_Kb。仿真表明，U- * cwe_Kb在高波条件下产生的SSC显着增加，与测量值有合理的一致性，波动摩擦系数f（w）在导致U- * cwe_Kb之间的差异中起关键作用（C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2017年第5期|59-73|共15页
  • 作者

    Lu Jing; Wang Xiao Hua; Babanin Alexander V.; Aijaz Saima; Sun Younjong; Teng Yong; Jung Kyung-Tae; Qiao Fangli;

  • 作者单位

    SOA, Inst Oceanog 1, 6 Xian Xia Ling Rd, Qingdao 266061, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao 266237, Peoples R China;

    Univ New South Wales, Sinoaustralian Res Ctr Coastal Management, Canberra, ACT 2600, Australia;

    Univ Melbourne, Melbourne, Vic, Australia;

    Australian Bur Meteorol, Melbourne, Vic, Australia;

    Korea Natl Pk Serv, Natl Pk Res Inst, Ctr Marine Res, Yeosu, South Korea;

    SOA, Inst Oceanog 1, 6 Xian Xia Ling Rd, Qingdao 266061, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao 266237, Peoples R China;

    KIOST, Ansan, South Korea;

    SOA, Inst Oceanog 1, 6 Xian Xia Ling Rd, Qingdao 266061, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao 266237, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Ripples; Sediment transport; Roughness; Bottom shear velocity; Combined wave-current stress; Jervis Bay;

    机译：波纹;泥沙输运;粗糙度;底切速度;波流应力;杰维斯湾;

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