Interactions between Fragmented Seagrass Canopies and the Local Hydrodynamics
| Autor: | Marianna Soler, Jordi Colomer, Carolyn Oldham, Xavier Casamitjana, Teresa Serra, Nazha El Allaoui |
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| Přispěvatelé: | Ministerio de Ciencia e Innovación (Espanya) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Canopy Geologic Sediments Leaves 010504 meteorology & atmospheric sciences Velocity Marine and Aquatic Sciences lcsh:Medicine Plant Science Atmospheric sciences Oceanography 01 natural sciences Ocean Waves Wind wave Biomass lcsh:Science Turbulència Sedimentary Geology Multidisciplinary Ecology Turbulence Physics Plant Anatomy Classical Mechanics Geology Vegetation Spatial heterogeneity Community Ecology Physical Sciences Research Article Ones Hydrocharitaceae Fluid Mechanics Continuum Mechanics Motion Water Movements Ecosystem 0105 earth and related environmental sciences Petrology Hidrodinàmica 010604 marine biology & hydrobiology Attenuation Plant Ecology Ecology and Environmental Sciences lcsh:R Fragmentation (computing) Biology and Life Sciences Fluid Dynamics Models Theoretical Turbulence kinetic energy Earth Sciences Hydrodynamics Waves Environmental science Sediment lcsh:Q |
| Zdroj: | PLoS ONE, Vol 11, Iss 5, p e0156264 (2016) PLoS ONE PLoS ONE, 2016, vol. 11, núm. 5, p. e0156264 Articles publicats (D-F) DUGiDocs – Universitat de Girona instname Recercat. Dipósit de la Recerca de Catalunya |
| ISSN: | 1932-6203 |
| Popis: | The systematic creation of gaps within canopies results in fragmentation and the architecture of fragmented canopies differs substantially from non-fragmented canopies. Canopy fragmentation leads to spatial heterogeneity in hydrodynamics and therefore heterogeneity in the sheltering of canopy communities. Identifying the level of instability due to canopy fragmentation is important for canopies in coastal areas impacted by human activities and indeed, climate change. The gap orientation relative to the wave direction is expected to play an important role in determining wave attenuation and sheltering. Initially we investigated the effect of a single transversal gap within a canopy (i.e. a gap oriented perpendicular to the wave direction) on hydrodynamics, which was compared to fully vegetated canopies (i.e. no gaps) and also to bare sediment. The wave velocity increased with gap width for the two canopy densities studied (2.5% and 10% solid plant fraction) reaching wave velocities found over bare sediments. The turbulent kinetic energy (TKE) within the gap also increased, but was more attenuated by the adjacent vegetation than the wave velocity. As expected, denser canopies produced a greater attenuation of both the wave velocity and the turbulent kinetic energy within an adjacent gap, compared to sparse canopies. Using non-dimensional analysis and our experimental data, a parameterization for predicting TKE in a canopy gap was formulated, as a function of easily measured variables. Based on the experimental results, a fragmented canopy model was then developed to determine the overall mixing level in such canopies. The model revealed that canopies with large gaps present more mixing than canopies with small gaps despite having the same total gap area in the canopy. Furthermore, for the same total gap area, dense fragmented canopies provide more shelter than sparse fragmented canopies This work was supported by Ministerio de Ciencia e Innovación of the Spanish Government through grant CGL2010-17289 |
| Databáze: | OpenAIRE |
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