Periodic water waves through an aquatic forest

Liu, Philip L.‐F.; Chang, Che‐Wei; Mei, Chiang C.; Lomónaco, Pedro; Martín, Francisco López; Maza, María

doi:10.1016/j.coastaleng.2014.11.002

Cited by 60 publications

(68 citation statements)

References 11 publications

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“…The physical processes in unidirectional flow through vegetation have been extensively investigated (Aberle & Järvelä, ; Ackerman & Okubo, ; López & García, ; ; Nepf, ; Tinoco & Cowen, ; Yang et al, ). For oscillatory flows, experimental studies have mostly focused on the effects of vegetation on wave dissipation and bulk form drag, either in the field (Horstman et al, ; Mazda et al, , ; Vo‐Luong & Massel, ) or in the laboratory (Augustin et al, ; Houser et al, ; P. Liu et al, ; Maza Fernández, ; Stratigaki et al, ). Such approaches have allowed the development of models to predict bulk wave dissipation and drag coefficients (Dalrymple et al, ; Henry et al, ; Kobayashi et al, ; Maza et al, ; Mendez & Losada, ; H. Wang et al, ; X. Wang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Turbulence as the Main Driver of Resuspension in Oscillatory Flow Through Vegetation

2018

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A series of laboratory experiments was conducted using arrays of rigid cylinders in a sandy bed as a proxy for mangrove roots and benthos. Synchronous colocated measurements of velocity and suspended sediment concentration were recorded within the array to investigate the effect of array density on sediment resuspension under different wave conditions. The measured increase in turbulent kinetic energy resulting from flow‐vegetation interactions is directly linked to the observed increase in sediment resuspension. The observations emphasize the role of turbulent kinetic energy generated by the flow‐vegetation interactions, rather than bed shear stress by the mean velocity, as the main driver of resuspension within the array. We test a modified Shields parameter analysis, as well as analytical predictions previously developed for unidirectional currents, which accurately predict resuspension thresholds under oscillatory flow conditions.

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Section: Introductionmentioning

confidence: 99%

Turbulence as the Main Driver of Resuspension in Oscillatory Flow Through Vegetation

2018

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“…Dalrymple et al's (1984) formulation was extended for random waves by Mendez and Losada (2004) and for wave and current conditions by Losada et al (2016) while Kobayashi et al's (1993) solution was extended for flexible vegetation by Dubi and Torum (1994) and for wave and current conditions by Otta et al, (2004). Recently, Chen and Zhao (2012) and Liu et al (2015) proposed an analytical model for submerged and emergent vegetation canopy.…”

Section: Introductionmentioning

confidence: 99%

Three-Layer Analytical Solution for Wave Attenuation by Suspended and Nonsuspended Vegetation Canopy

Zhu

Zou²

2017

Int. Conf. Coastal. Eng.

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A generalized three-layer analytical solution for the wave attenuation by suspended and non-suspended vegetation canopy is developed in this study. The analytical solution reduces to the two-layer analytical solution by Kobayashi et al. (1993) for the non-suspended vegetation canopy rooted at the sea bed. The present theory is verified using laboratory experiments and field observations of a suspended and non-suspended as well as emerged and submerged vegetation canopy. The wave attenuation increase with the drag coefficient, blade diameter and length, canopy density and length, the elevation of the bottom of the canopy and the incident wave height. The influences of wave frequency and water depth on wave attenuation are more complex. They affect the wave attenuation mainly by changing the wave flow velocity encountered by the vegetation canopy. As a result, the canopy vertical position has significant impact on the relationship between the wave attenuation and wave frequency.

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“…Aquatic vegetation, such as salt marshes, plays a significant role in mitigating coastal hazards in nearshore regions by dissipating the wave energy, reducing the storm surges, and influencing the wave setup/setdown. The effects of coastal vegetation on wave attenuation have been well acknowledged and quantified through numerous studies (e.g., Anderson & Smith, 2014;Bradley & Houser, 2009;Chakrabarti et al, 2017;Chen & Zhao, 2012;Chen et al, 2017;Dalrymple et al, 1984;Hu et al, 2014;Liu et al, 2015;Lowe et al, 2007;Luhar et al, 2017;Mattis et al, 2015;Mendez & Losada, 2004;Möller et al, 2014;Wu & Cox, 2015;Wu et al, 2011;Zhu & Chen, 2017). The effects of vegetation on storm surge reduction have also been investigated (e.g., Glass et al, 2018;Hu et al, 2015;Sheng et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Phase‐Averaged Drag Force of Nonlinear Waves Over Submerged and Through Emergent Vegetation

Zhu

Chen

2019

JGR Oceans

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Aquatic vegetation protects the shoreline by dissipating the wave energy and reducing the mean water level. For the latter, the phase‐averaged depth‐integrated drag force induced by vegetation ( trueFd‾) plays an essential role. For linear waves, the trueFd‾ exerted by submerged vegetation ( trueFdsub‾) and by the submerged part of emergent vegetation ( trueFdtrough‾) equal 0. As the wave nonlinearity increases, the profile of the horizontal velocity (u) becomes skewed and non–cosine shaped, and thus, both trueFdsub‾ and trueFdtrough‾ are nonzero (phase average of u|u|≠0) and their significance increases. This study examines the effects of wave nonlinearity and vegetation submergence on trueFd‾ based on stream function wave theory. In deep water, it is found that the wave nonlinearity slightly affects trueFdtrough‾ due to the negligible weight of trueFdtrough‾ in the overall trueFd‾. Both the wave nonlinearity and vegetation submergence have negligible effects on trueFdsub‾ as well. In shallow water, trueFdtrough‾ takes up a large percentage in the overall trueFd‾ for emergent vegetation, and a linear relationship between trueFdsub‾ and vegetation submergence exists for waves with relatively small wave heights. The applicable range of the linear wave theory based trueFd‾ is determined using trueFd‾ from stream function wave theory as a reference solution. Moreover, a parametric model is developed for evaluating trueFd‾ for random waves. The mean water level changes, or wave setup, on a vegetated sloping beach are validated and quantified using experimental data obtained from literature.

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Periodic water waves through an aquatic forest

Cited by 60 publications

References 11 publications

Turbulence as the Main Driver of Resuspension in Oscillatory Flow Through Vegetation

Turbulence as the Main Driver of Resuspension in Oscillatory Flow Through Vegetation

Three-Layer Analytical Solution for Wave Attenuation by Suspended and Nonsuspended Vegetation Canopy

Phase‐Averaged Drag Force of Nonlinear Waves Over Submerged and Through Emergent Vegetation

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