Nonhydrostatic Numerical Modeling of Fixed and Mobile Barred Beaches: Limitations of Depth-Averaged Wave Resolving Models around Sandbars

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
S. Elsayed, R. Gijsman, T. Schlurmann, N. Goseberg
{"title":"Nonhydrostatic Numerical Modeling of Fixed and Mobile Barred Beaches: Limitations of Depth-Averaged Wave Resolving Models around Sandbars","authors":"S. Elsayed, R. Gijsman, T. Schlurmann, N. Goseberg","doi":"10.1061/(asce)ww.1943-5460.0000685","DOIUrl":null,"url":null,"abstract":": Along sandy coastlines, submerged, shore-parallel sandbars play an essential role in shoreline morphology by dissipating wave energy through depth-induced wave breaking. While wave breaking and sediment transport around sandbars are complex three-dimensional (3D) processes, shoreline morphology is typically simulated with depth-averaged models that feature lower computational demand than do 3D models. In this context, this study examines the implications of depth-averaging the fl ow fi eld and approximating the breaking process in nonhydrostatic models (e.g., XBeach nonhydrostatic) for the hydro-and morphodynamic processes around sandbars. The implications are drawn based on reproducing large-scale experiments of a barred beach pro fi le using the single-layer (XBNH) and the reduced two-layer (XBNH + ) modes of XBeach. While hydrodynamic processes were predicted with high accuracy on the sandbar ’ s seaward side, wave heights were overpredicted on the bar ’ s landward side. The overestimation was due to the simpli fi ed reproduction of the complex breaking process near the sandbar ’ s peak, particularly in terms of the generated turbulence in the water column. Moreover, the velocity pro fi le with a strong undertow could only be represented in a simpli fi ed way even using the two-layer mode XBNH + , thus resulting in inaccurate predictions of sediment loads around the sandbar. A parametric study is performed, and it revealed which model parameters control the simulation of the wave-breaking process. Thus, wave height predictions could be improved by tuning the energy-dissipation parameters. However, fl ow velocities and morphodynamic predictions could not be improved accordingly. Thus, this study identi fi es possible hydrodynamic model improvements, such as incorporating a roller dissipation model. Moreover, it improves understanding of key drivers and processes that should be included in nonhydrostatic depth-averaged models to simulate morphological changes around sandbars more ef fi ciently. DOI: 10.1061/(ASCE)WW.1943-5460.0000685 . This work is made available under the terms of the Creative Commons Attribution 4.0 International license, https://creativecommons.org/licenses/by/4.0/.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1061/(asce)ww.1943-5460.0000685","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 5

Abstract

: Along sandy coastlines, submerged, shore-parallel sandbars play an essential role in shoreline morphology by dissipating wave energy through depth-induced wave breaking. While wave breaking and sediment transport around sandbars are complex three-dimensional (3D) processes, shoreline morphology is typically simulated with depth-averaged models that feature lower computational demand than do 3D models. In this context, this study examines the implications of depth-averaging the fl ow fi eld and approximating the breaking process in nonhydrostatic models (e.g., XBeach nonhydrostatic) for the hydro-and morphodynamic processes around sandbars. The implications are drawn based on reproducing large-scale experiments of a barred beach pro fi le using the single-layer (XBNH) and the reduced two-layer (XBNH + ) modes of XBeach. While hydrodynamic processes were predicted with high accuracy on the sandbar ’ s seaward side, wave heights were overpredicted on the bar ’ s landward side. The overestimation was due to the simpli fi ed reproduction of the complex breaking process near the sandbar ’ s peak, particularly in terms of the generated turbulence in the water column. Moreover, the velocity pro fi le with a strong undertow could only be represented in a simpli fi ed way even using the two-layer mode XBNH + , thus resulting in inaccurate predictions of sediment loads around the sandbar. A parametric study is performed, and it revealed which model parameters control the simulation of the wave-breaking process. Thus, wave height predictions could be improved by tuning the energy-dissipation parameters. However, fl ow velocities and morphodynamic predictions could not be improved accordingly. Thus, this study identi fi es possible hydrodynamic model improvements, such as incorporating a roller dissipation model. Moreover, it improves understanding of key drivers and processes that should be included in nonhydrostatic depth-averaged models to simulate morphological changes around sandbars more ef fi ciently. DOI: 10.1061/(ASCE)WW.1943-5460.0000685 . This work is made available under the terms of the Creative Commons Attribution 4.0 International license, https://creativecommons.org/licenses/by/4.0/.
固定和移动条形海滩的非静力数值模拟:沙洲周围深度平均波浪解析模型的局限性
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信