Effects of Seagrass on Nearshore Current and Wave Dynamics

Wallace, Scott; Cox, Ron

doi:10.1061/40549(276)68

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…The energy lost by waves because of vegetation was expressed as a function of the bulk drag coefficient C d and physical characteristics of the plants: Kobayashi et al (1993); 3, Mendez and Losada (2004);4, Mork (1996b);5, Rosman et al (2007);6, Massel et al (1999);7, Mazda et al (1997a);8, Mazda et al (2006);9, Quartel et al (2007);10, Vo-Luong andMassel (2006, 2008);11, Allen et al (2008);12, Bouma et al (2005); 13, Bouma et al (2010);14, Cooper (2005);15, Knutson et al (1982);16, Moller (2006);17, Mö ller et al (1999);18, Morgan et al (2009);19, Shi et al (2000); 20, Tschirky et al (2001);21, Wayne (1976);22, Yang (1998);23, Yang et al (2008);24, Bradley and Houser (2009);25, Cox et al (2003);26, Fonseca and Cahalan (1992);27, Huber (2003); 28, Koch (1996); 29, Ota et al (2004);30, Prager and Halley (1999); 31, Price et al (1969); 32, Wallace and Cox (2001).…”

Section: Calculating the Bulk Drag Coefficient Of Vegetation On Wavesmentioning

confidence: 99%

Quantifying wave attenuation to inform coastal habitat conservation

2013

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Abstract. Coastal vegetation can protect people and property from erosion and flooding, potentially providing a win-win solution for conservation and development. However, the conditions under which natural habitats provide protection have been controversial, partly because the geomorphic, ecological, and hydrodynamic factors that determine wave attenuation vary greatly among locations, times, and studies. We re-analyzed existing wave attenuation studies in kelp, mangrove, marsh and seagrass habitats and found that much of the variation in wave attenuation can be explained by differences in vegetation characteristics and by the change in bulk drag with flow conditions. We found that vegetation can exert substantial drag on passing waves, but that the bulk drag coefficient declines in flow conditions characterized by high Reynolds numbers. This decline is important because storm conditions are highly turbulent (typical Reynolds numbers are greater than 10 4 ), and we lack empirical measurements of bulk drag coefficients from such conditions. Failing to account for the decline can over-estimate wave attenuation in storms by 19% to 1600%. These results suggest that larger habitat areas will need to be set aside for coastal protection than previously thought. Our approach provides predictions for designing practical habitat conservation and restoration plans that also protect humans and property from flooding and erosion.

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Section: Calculating the Bulk Drag Coefficient Of Vegetation On Wavesmentioning

confidence: 99%

Quantifying wave attenuation to inform coastal habitat conservation

2013

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“…Because of its influence on coastal inundation, beach erosion and the ecological health of coastal waters, the interaction of vegetation and storm waves or tsunamis have also received increasing attention. 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.).…”

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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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Effects of Seagrass on Nearshore Current and Wave Dynamics

Cited by 2 publications

References 9 publications

Quantifying wave attenuation to inform coastal habitat conservation

Quantifying wave attenuation to inform coastal habitat conservation

Waves of intermediate length through an array of vertical cylinders

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