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Experimental study on vegetation flexibility as control parameter for wave damping and velocity structure
Coastal Engineering ( IF 4.4 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.coastaleng.2020.103648
Thomas J. van Veelen , Tom P. Fairchild , Dominic E. Reeve , Harshinie Karunarathna

Abstract Vegetation can contribute to coastal defence by damping incoming waves. However, prior studies have shown that attenuation varies greatly among plant species. Plant flexibility is a mechanical property that is commonly omitted, but varies considerably between shrubs and grasses on salt marshes. Therefore, we present an experimental study in a laboratory wave flume with artificial vegetation that differs in flexibility only. We measured wave attenuation and water particle velocities around rigid and flexible salt marsh vegetation. Waves were measured using a series of gauges and Particle Image Velocimetry (PIV) was used to measure spatio-temporal variations of water particle velocities in the x - z plane around the vegetation. Our results show that flexible vegetation attenuates waves up to 70% less than rigid vegetation due to swaying of flexible plants. Furthermore, we find that rigid vegetation modifies the velocity structure, whereas flexible vegetation does not. Specifically, a mean current in the direction of wave propagation develops around the canopy and the horizontal particle velocities are amplified directly above the canopy. These results indicate that plant flexibility is a key parameter in the wave-vegetation interaction that controls wave damping and velocity structure.

中文翻译:

植被柔度作为波浪阻尼和速度结构控制参数的试验研究

摘要 植被可以通过抑制来波来为海岸防御做出贡献。然而,先前的研究表明,植物物种之间的衰减差异很大。植物柔韧性是一种通常被忽略的机械特性,但在盐沼上的灌木和草之间差异很大。因此,我们在实验室波浪水槽中进行了一项实验研究,其中人工植被仅在灵活性上有所不同。我们测量了刚性和柔性盐沼植被周围的波衰减和水粒子速度。使用一系列仪表测量波浪,并使用粒子图像测速法 (PIV) 测量植被周围 x-z 平面中水粒子速度的时空变化。我们的结果表明,由于柔性植物的摇摆,柔性植被对波浪的衰减比刚性植被小 70%。此外,我们发现刚性植被会改变速度结构,而柔性植被不会。具体而言,沿波传播方向的平均电流在冠层周围发展,并且水平粒子速度在冠层正上方被放大。这些结果表明,植物灵活性是控制波浪阻尼和速度结构的波浪-植被相互作用中的关键参数。沿波传播方向的平均电流在冠层周围形成,并且水平粒子速度在冠层正上方被放大。这些结果表明,植物灵活性是控制波浪阻尼和速度结构的波浪-植被相互作用中的关键参数。沿波传播方向的平均电流在冠层周围形成,并且水平粒子速度在冠层正上方被放大。这些结果表明,植物灵活性是控制波浪阻尼和速度结构的波浪-植被相互作用中的关键参数。
更新日期:2020-04-01
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