Wave damping by seagrass meadows in combined wave‐current conditions

Schaefer, Rachel; Nepf, Heidi

doi:10.1002/lno.12102

Cited by 14 publications

(8 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The existence of seagrass meadows within nearshore regions can impose more complex hydrodynamics processes than bare sand environments (Nepf 2012;Schaefer and Nepf 2020). Seagrasses attenuate sea-swell waves providing a sheltered area across the meadows (Oprandi et al, 2020).…”

Section: The Interaction Between Seagrass Canopy and Hydrodynamicsmentioning

confidence: 99%

Hydrodynamics across seagrass meadows and its impacts on Indonesian coastal ecosystems: A review

Risandi¹,

Rifai²,

Lukman³

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

Seagrass canopies are important components of the world’s coastal environments providing critical ecological services. Nearshore hydrodynamics, i.e., waves and currents, are essential in controlling the ecological processes across coastal environments. Seagrass meadows can impose more complex hydrodynamics processes by attenuating sea-swell waves and decreasing the impact of nearshore mean water level rise due to wave setup and Infragravity (IG) waves. Consequently, the seagrasses dissipate waves and reduce flows allowing sediments to settle and accrete the shorelines. However, despite their significant roles, knowledge of hydrodynamics in the Indonesian seagrass ecosystems is relatively limited compared to other coastal ecosystems such as sandy beaches, mangroves, and coral reefs. This review highlights the dynamics of waves and currents, and their interaction with sediment transport and ecological processes, including biogeochemical and dispersal processes on the seagrass ecosystem contributing to the existing seagrass research in Indonesia. The associated literature is collected from scientific databases such as Scopus and Google Scholar that range between 1965 and 2021. The result showed that most of the research on hydrodynamic in seagrass ecosystems was carried out in temperate zones. Until recently, there have been limited publications discussing the interaction between the Indonesian (tropical) seagrass ecosystem and hydrodynamics parameters, even though the region has abundant seagrass species. Moreover, Indonesia is strongly influenced by various atmospheric-oceanic forcing, including the Asian monsoon affecting the dynamic of the coastal area with seagrass ecosystems. At a canopy scale, the correlation between the nearshore (tropical) hydrodynamics and ecological processes in the system is yet to be explored. Considering the potential benefit of seagrasses to coastal ecosystems, developing future research in hydrodynamics across the ecosystem is critical to overcoming the knowledge gaps in Indonesia. The knowledge gained could support the Indonesian seagrass ecosystem services and their resilience to potential hazards and climate change.

show abstract

Section: The Interaction Between Seagrass Canopy and Hydrodynamicsmentioning

confidence: 99%

Hydrodynamics across seagrass meadows and its impacts on Indonesian coastal ecosystems: A review

Risandi¹,

Rifai²,

Lukman³

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…Eq. ( 5) has been successfully applied to calculate drag forces on anchors under pure wave conditions 19 and wave damping under combined waves and currents 38 . Other KC-based formulations of C D following the form of Eq.…”

Section: Wave Decaymentioning

confidence: 99%

“…Note that in Eq. ( 14), U rms w represents the phase-averaged root mean square wave velocity, whereby recently, other authors have opted for the calculation of the wave velocity amplitude, obtained by multiplying the arguments within the square root by 2 38,46 . Throughout this paper, the wave velocity amplitude refers to the minimum and maximum of the measured phase averaged wave velocity (U min w and U max w , respectively).…”

Section: Data Processing and Analysismentioning

confidence: 99%

Flexible anchored mats of artificial seagrass for restoration: wave dynamics and agreement with contemporary models

Villanueva

Paul

Schlurmann

2023

Preprint

View full text Add to dashboard Cite

Seagrass restoration requires a sound understanding of the hydrodynamics around established meadows. Present know-how primarily stems from idealized artificial seagrass (ASG) attached to a fixed bed. With the goal of accessible field deployment for restoration, anchored prototype scale ASG mats (coconut mesh) were tested under differing wave conditions to analyze hydrodynamic interaction and assess the suitability of contemporary predictive models. Velocity structure and wave propagation were measured around one and two ASG mats (separated by a 2-m gap). The mats reduced orbital velocities by up to 16% (2 mats), whereby the average reduction was low (< 10%) compared to the non-vegetated conditions. Velocities increased above the ASG, with the gap enhancing velocity (up to 11%) instead of attenuating it. Wave decay followed an exponential decrease, further enhanced by the second mat. Current models did not capture the induced hydrodynamics for the full range of wave conditions tested, with the second mat increasing uncertainties. Wave decay models generally overestimated wave attenuation (up to 30%), except for longer wave periods. Nevertheless, for the full range of conditions, the models provide accurate insight into the expected magnitude of attenuation under field conditions. It is speculated that mat flexibility affects the surrounding hydrodynamics through inherent motion, with the gap contributing to the uncertainties.

show abstract

“…Such maps could also be used as input for numerical models (e.g. Silva et al, 2020), incorporating mechanical traits (Soissons et al, 2018), friction, or damping coefficients, obtained from laboratory experiments (Stratigaki et al, 2011;Koftis et al, 2013;Schaefer and Nepf, 2022). Such experimentally determined coefficients are vital in the calibration and validation of hydrodynamic numerical models (e.g.…”

Section: Introductionmentioning

confidence: 99%

Mapping the structure of mixed seagrass meadows in the Mexican Caribbean

et al. 2022

View full text Add to dashboard Cite

The physical and ecological importance of seagrass meadows in coastal processes is widely recognized, and the development of tools facilitating characterization of their structure and distribution is important for improving our understanding of these processes. Mixed (multi-specific) meadows in a Mexican Caribbean reef lagoon were mapped employing a multiparameter approach, using PlanetScope remote sensing images, and supervised classification based on parameters related to the structure of the seagrasses meadows, including the cover percentages of seagrass/algae/sediment, algae thalli and seagrass shoot densities, canopy heights and estimated leaf area index (LAI). The cover, seagrass and algae densities, and seagrass canopy heights were obtained using ground truth sampling, while the LAI was estimated using data obtained from long-term monitoring programs. The maps do not show the differentiation of seagrass species, but ground truthing contemplated characterization of the density of Thalassia testudinum, Syringodium filiforme and Halodule wrightii and their respective LAIs. S. filiforme was the dominant species in terms of shoot density, and T. testudinum was dominant in terms of LAI. In the multiparameter-based map four classes were defined, based on the cover and structural characteristics, and its overall accuracy was very high (~90%). Maps based on sediment cover and LAI alone also had 4 classes, but they were less accurate than the multiparameter-based map (~70% and ~80%, respectively). The multiparameter-based seagrass map provided spatially-explicit data on the abundance and structure of seagrasses, useful for future monitoring of the changes in the meadows, and also for studies of that require data of large-scale meadow structure, such as inventories of associated biota, blue carbon storage, or modelling of the local hydrodynamics.

show abstract

Wave damping by seagrass meadows in combined wave‐current conditions

Cited by 14 publications

References 52 publications

Hydrodynamics across seagrass meadows and its impacts on Indonesian coastal ecosystems: A review

Hydrodynamics across seagrass meadows and its impacts on Indonesian coastal ecosystems: A review

Flexible anchored mats of artificial seagrass for restoration: wave dynamics and agreement with contemporary models

Mapping the structure of mixed seagrass meadows in the Mexican Caribbean

Contact Info

Product

Resources

About