Abstract
This paper presents a coupled wave-vegetation interaction model suitable for very flexible vegetation with large deflections. The wave hydrodynamics is modeled by a Navier-Stokes flow solver along with a Volume of Fluid surface capturing method. The governing equation for flexible vegetation motion is solved by a Finite Element Method using a semi-implicit time differencing scheme. The coupling between wave hydrodynamics and vegetation motion is achieved using an immersed boundary method. The model is validated with experimental measurements for a single-stem vegetation and a large-scale vegetation patch in a wave flume.
Highlights
Vegetation plays an important role in protecting natural shoreline against storm surge and waves.Majority of previous studies of wave-vegetation interaction focus on fixed vegetation. Li & Yan (2007) and Marsooli & Wu (2014) considered rigid vegetation in their Reynolds Averaged Navier-Stokes (RANS) models and neglected the swaying motion of the vegetation. Maza et al (2013) used a twodimensional RANS model coupled with a submerged vegetation model, which solves only the displacement at the top of each stem and assumes a linear variation of deflection along the stem. Zhu and Chen (2015) coupled a non-hydrostatic phase resolving wave model, NHWAVE, with a Finite Element Method (FEM) based vegetation model
The objective of this study is to develop a new coupled wave and vegetation model suitable for flexible vegetation with large sway of motion
Wave Interaction with a Single-stem Flexible Vegetation Abdelrhman (2007) photographed Z. marina blades exposed to three different current speeds Uc =
Summary
Vegetation plays an important role in protecting natural shoreline against storm surge and waves.Majority of previous studies of wave-vegetation interaction focus on fixed vegetation. Li & Yan (2007) and Marsooli & Wu (2014) considered rigid vegetation in their Reynolds Averaged Navier-Stokes (RANS) models and neglected the swaying motion of the vegetation. Maza et al (2013) used a twodimensional RANS model coupled with a submerged vegetation model, which solves only the displacement at the top of each stem and assumes a linear variation of deflection along the stem. Zhu and Chen (2015) coupled a non-hydrostatic phase resolving wave model, NHWAVE, with a Finite Element Method (FEM) based vegetation model. Li & Yan (2007) and Marsooli & Wu (2014) considered rigid vegetation in their Reynolds Averaged Navier-Stokes (RANS) models and neglected the swaying motion of the vegetation. Maza et al (2013) used a twodimensional RANS model coupled with a submerged vegetation model, which solves only the displacement at the top of each stem and assumes a linear variation of deflection along the stem. Zhu and Chen (2015) coupled a non-hydrostatic phase resolving wave model, NHWAVE, with a Finite Element Method (FEM) based vegetation model. The complete force balance equation for the vegetation motion was solved. Their vegetation model is suitable for small deflections only
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