High fidelity numerical modelling of European brushwood groyne fluid-structure-interaction: Parametrization through Darcy–Forchheimer, reflection and transmission coefficients

IF 4.2 2区 工程技术 Q1 ENGINEERING, CIVIL Coastal Engineering Pub Date : 2024-11-28 DOI:10.1016/j.coastaleng.2024.104659
Felix Spröer , Oliver Lojek , Christina Bischoff , Dorothea Bunzel , Maike Paul , Nils Goseberg
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引用次数: 0

Abstract

The shoreline retreat of salt marshes and tidal flats due to both accelerated rates of sea level rise (SLR) and altered sediment dynamics as a result of the interlinked impacts of climate change is becoming increasingly visible on a global scale. In particular, salt marsh retreat amplifies pressure on the main coastal protection facilities in areas of coastal squeeze and at the same time leads to the loss of unique biodiverse wetland ecosystems that provide a wide range of key ecosystem services. Salt marshes are generally able to dynamically adapt to SLR through vertical sediment accretion and lateral expansion under hydrodynamically calmed conditions, as long as sufficient sediment budgets are available. However, in areas of little or no foreshore growth, facilitating sufficient sediment accretion is essential to ensure optimal coastal foreshore management. In Northern Europe, brushwood groyne fields used for centuries provide such hydrodynamically calmed settlement spaces that facilitate sediment accretion, yet they are insufficiently investigated and parametrized in regard to their flow-retentive effectiveness. Hence, this study parametrizes European brushwood groynes in the framework of a Darcy–Forchheimer model through a three-dimensional numerical modelling suite within the numerical framework REEF3D:CFD to quantify the fluid–structure interaction of European brushwood groynes systematically. Through validation with an existent laboratory dataset, steady-state current as well as oscillatory wave brushwood groyne interaction is investigated, providing details on flow retention, wave transmissivity and reflectivity. For the first time, laminar and turbulent resistance coefficients of European brushwood groynes are presented that enable the representation of European brushwood groynes in phase-resolved numerical modelling approaches. Furthermore, in-depth wave transmission and reflection coefficients are derived for a vast range of hydrodynamic conditions and numerous relevant brushwood groyne construction variations relevant to coastal protection. The numerical results revealed transmission coefficients in the range of 0.15 to 0.87 and reflection coefficients in the range from 0.17 to 0.73. State of the art and novel parametrized fit-equations are derived from the wave transmission and reflection coefficients, providing readily available tools to estimate European brushwood groyne transmissivity and reflectivity. In turn, this study serves as a first primer for optimizing the design of European brushwood groyne fields and comparable coastal protection structures aimed at facilitating sediment deposition and foreshore stabilization in order to foster the protective capabilities of coastal wetlands and their ecosystem services now and in the future.
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欧洲灌丛沟壑区流固耦合的高保真数值模拟:通过Darcy-Forchheimer、反射系数和透射系数进行参数化
在全球范围内,由于气候变化相互关联的影响导致海平面上升速度加快和沉积物动力学改变,盐沼和潮滩的海岸线退缩正变得越来越明显。特别是,盐沼退缩增加了沿海挤压地区主要海岸保护设施的压力,同时导致提供广泛关键生态系统服务的独特生物多样性湿地生态系统的丧失。只要有足够的泥沙收支,在水动力平静条件下,盐沼一般能够通过垂直泥沙增积和侧向扩张来动态适应SLR。然而,在很少或没有前滨生长的地区,促进足够的沉积物增加对于确保最佳的沿海前滨管理至关重要。在北欧,几个世纪以来使用的灌丛砾岩田提供了这样的水动力平静沉降空间,促进了沉积物的增加,但它们在保流有效性方面的研究和参数化还不够充分。因此,本研究在Darcy-Forchheimer模型框架下,通过REEF3D:CFD数值框架下的三维数值模拟套件,对欧洲灌丛沟壑区进行参数化,系统地量化欧洲灌丛沟壑区流固耦合。通过与现有实验室数据的验证,研究了稳态电流和振荡波的相互作用,提供了流动保留、波透射率和反射率的详细信息。本文首次提出了欧洲灌丛沟壑区的层流和湍流阻力系数,使欧洲灌丛沟壑区在相位分辨数值模拟方法中的表现成为可能。此外,还推导了大范围水动力条件下的纵波透射和反射系数,以及与海岸保护相关的许多相关灌丛石坝结构变化。数值结果表明,透射系数在0.15 ~ 0.87之间,反射系数在0.17 ~ 0.73之间。从波的透射和反射系数中导出了最新的参数化拟合方程,为估计欧洲灌丛灌木的透射率和反射率提供了现成的工具。反过来,本研究为优化欧洲灌丛湿地和类似海岸保护结构的设计提供了第一个基础,旨在促进沉积物沉积和前岸稳定,以促进沿海湿地的保护能力及其现在和未来的生态系统服务。
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来源期刊
Coastal Engineering
Coastal Engineering 工程技术-工程:大洋
CiteScore
9.20
自引率
13.60%
发文量
0
审稿时长
3.5 months
期刊介绍: Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.
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Editorial Board High fidelity numerical modelling of European brushwood groyne fluid-structure-interaction: Parametrization through Darcy–Forchheimer, reflection and transmission coefficients Cross-shore hydrodynamics and morphodynamics modeling of an erosive event in the inner surf zone A comparison of linear and nonlinear 3D semi-Lagrangian motion of moored Waverider and Spotter wave buoys Experimental study on tsunami-driven debris damming loads on columns of an elevated coastal structure
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