Hydrodynamics induced by wind waves in a vegetation field

Méndez, Fernando J.; Losada, Íñigo J.; Losada, Miguel Á.

doi:10.1029/1999jc900119

Cited by 193 publications

(168 citation statements)

References 14 publications

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“…al. (1993) and Mendez et al (1999) were both obtained on the basis of the experiment of Asano et al (1988). The tests reported in the present paper are characterized by a Reynolds number in the range 4000-9500.…”

Section: Figure 7 Artificial Plant Leaves Apices Displacements As Obmentioning

confidence: 99%

Response of Posidonia Oceanica to Wave Motion in Shallow-Waters - Preliminary Experimental Results

Cavallaro

Re²,

Paratore

et al. 2011

Int. Conf. Coastal. Eng.

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Aim of the present work is to contribute to the knowledge about the interaction between the flow induced by waves and the aquatic vegetation. More in details, the results of preliminary tests of an experimental laboratory investigation about the response of a Posidonia Oceanica meadow to wave motion in shallow waters is reported. A wide attention was posed to the behavior of a synthetic plants with plastic material. To this aim an image acquisition technique was used to analyze and compare the movement of both the artificial plant and the real one. The experiments carried out about the interaction between the artificial meadow and the waves showed a significant wave dumping, in particular in the case of plants having the same length of the water depth.

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Section: Figure 7 Artificial Plant Leaves Apices Displacements As Obmentioning

confidence: 99%

Response of Posidonia Oceanica to Wave Motion in Shallow-Waters - Preliminary Experimental Results

Cavallaro

Re²,

Paratore

et al. 2011

Int. Conf. Coastal. Eng.

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“…Vegetation has been shown to effectively attenuate flow (Fonseca et al 1982;Peterson et al 2004) and wave energy (Dean 1978;Fonseca and Cahalan 1992;Kobayashi et al 1993;Mendez et al 1999;Möller et al 1999;Dean and Bender 2006;Augustin et al 2009). Several models for predicting wave dissipation through vegetation have been proposed based on the conservation of energy (Dalrymple et al 1984;Mendez and Losada 2004) and conservation of momentum (Kobayashi et al 1993) for linear waves, and these have subsequently been expanded and new models proposed (Dubi and Torum 1995;Mendez et al 1999;Chen and Zhao 2012). Additional models investigating wave attenuation under the combination of wave flow and current flow (Ota et al 2005;Li and Yan 2007) have also been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Procedures have been developed to translate individual obstruction drag elements into a canopy drag (Dalrymple et al 1984;Kobayashi et al 1993;Mendez et al 1999). These methods based on the fundamental principles of energy and momentum conservation and superposition have been used to reasonably model canopies, but the drag parameters for the bulk system are often modified from the drag parameters associated with individual elements.…”

Section: Introductionmentioning

confidence: 99%

“…Use of a non-dimensional drag coefficient is advantageous as it is independent of plant area, which may change seasonally, but is dependent on the morphology and hydrodynamics. For Thalassia testudinum (Bradley and Houser 2009), Zostera noltti (Paul and Amos 2011), and artificial kelp (Kobayashi et al 1993;Mendez et al 1999), exponential functions of Reynolds number were determined for the estimation of drag coefficients with reasonable accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Flume instrumentation for measurement of drag on flexible elements under waves

2014

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Understanding energy dissipation by vegetation is critical for the effective management of shoreline erosion. Current methods for estimating energy dissipation require plant-specific parameters that are difficult to estimate for the large variety of plant morphologies used in shoreline protection, requiring testing on each species of interest. A simple and fast method to characterize drag in terms of wave interaction and obstruction natural frequency is needed to fully explore drag forces on vegetation. Our method directly measures hydrodynamic forces on individual plant shoots using a torque sensor mounted beneath the bed of a flume. This sensor allows data to be collected simply and inexpensively with high temporal accuracy that provides insight into drag forces and torque frequency from a variety of flexible elements when coupled with wave monitoring. The technique can evaluate several types of obstructions quickly without the need to set up an entire obstruction field. The data collected also suggest that more flexible objects result in less drag force on each element and suggest that frequency response is related to the frequencies existing in the driving wave and the natural frequency of the obstruction element, although harmonic synchronization appears to occur in some cases doubling the expected drag force magnitude.

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“…For example, wave flume simulation of kelps, seagrasses, and coastal trees have been conducted by [1,3,6,7,23,29,33,34,38,40,42], among others. Mathematical models starting from macro-scale (wavelength-scale) equations have been proposed by many (e.g., [5,16,22,17] etc.). Typically the inviscid and irrotational theory is used as the basis.…”

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confidence: 99%

Waves of intermediate length through an array of vertical cylinders

2013

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We report a semi-analytical theory of wave propagation through a vegetated water. Our aim is to construct a mathematical model for waves propagating through a lattice-like array of vertical cylinders, where the macro-scale variation of waves is derived from the dynamics in the micro-scale cells. Assuming infinitesimal waves, periodic lattice configuration, and strong contrast between the lattice spacing and the typical wavelength, the perturbation theory of homogenization (multiple scales) is used to derive the effective equations governing the macro-scale wave dynamics. The constitutive coefficients are computed from the solution of micro-scale boundary-value problem for a finite number of unit cells. Eddy viscosity in a unit cell is determined by balancing the time-averaged rate of dissipation and the rate of work done by wave force on the forest at a finite number of macro stations. While the spirit is similar to RANS scheme, less computational effort is needed. Using one fitting parameter, the theory is used to simulate three existing experiments with encouraging results. Limitations of the present theory are also pointed out.

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Hydrodynamics induced by wind waves in a vegetation field

Cited by 193 publications

References 14 publications

Response of Posidonia Oceanica to Wave Motion in Shallow-Waters - Preliminary Experimental Results

Response of Posidonia Oceanica to Wave Motion in Shallow-Waters - Preliminary Experimental Results

Flume instrumentation for measurement of drag on flexible elements under waves

Waves of intermediate length through an array of vertical cylinders

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