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Spectral distribution of wave energy dissipation by salt marsh vegetation

Jadhav, Ranjit S. ; Chen, Qin ; Smith, Jane M.

Coastal engineering (Amsterdam), 2013-07, Vol.77, p.99-107 [Periódico revisado por pares]

Kidlington: Elsevier B.V

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Título:
Spectral distribution of wave energy dissipation by salt marsh vegetation
Autor: Jadhav, Ranjit S. ; Chen, Qin ; Smith, Jane M.
Assuntos: Animal and plant ecology ; Animal, plant and microbial ecology ; Biological and medical sciences ; Canopies ; Dissipation ; Drag coefficient ; Drag coefficients ; Drag force ; Earth sciences ; Earth, ocean, space ; Energy dissipation ; Exact sciences and technology ; Frequency-dependent energy dissipation ; Fundamental and applied biological sciences. Psychology ; Geomorphology, landform evolution ; Marine and continental quaternary ; Random waves ; Salt marsh vegetation ; Salt marshes ; Spartina alterniflora ; Spectra ; Surficial geology ; Synecology ; Terrestrial ecosystems ; Vegetation ; Wave damping ; Wetlands
É parte de: Coastal engineering (Amsterdam), 2013-07, Vol.77, p.99-107
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: Spectral energy dissipation of random waves due to salt marsh vegetation (Spartina alterniflora) was analyzed using field data collected during a tropical storm. Wave data (significant wave heights up to 0.4m in 0.8m depth) were measured over a two-day period along a 28m transect using 3 pressure transducers. The storm produced largely bimodal spectra on the wetland, consisting of low-frequency swell (7–10s) and high-frequency (2–4.5s) wind-sea. The energy dissipation varied across the frequency scales with the largest magnitude observed near the spectral peaks, above which the dissipation gradually decreased. The wind-sea energy dissipated largely in the leading section of the instrument array in the wetland, but the low-frequency swell propagated to the subsequent section with limited energy loss. Across a spectrum, dissipation did not linearly follow incident energy, and the degree of non-linearity varied with the dominant wave frequency. A rigid-type vegetation model was used to estimate the frequency-dependent bulk drag coefficient. For a given spectrum, this drag coefficient increased gradually up to the peak frequency and remained generally at a stable value at the higher frequencies. This spectral variation was parameterized by employing a frequency-dependent velocity attenuation parameter inside the canopy. This parameter had much less variability among incident wave conditions, compared to the variability of the bulk drag coefficient, allowing its standardization into a single, frequency-dependent curve for velocity attenuation inside a canopy. It is demonstrated that the spectral drag coefficient predicts the frequency-dependent energy dissipation with more accuracy than the integral coefficient. •Insight into spectral distribution of energy dissipation by vegetation•New parameterization of spectral-varying bulk drag coefficient for salt marshes•Improving the prediction of spectral distribution of energy dissipation due to vegetation
Editor: Kidlington: Elsevier B.V
Idioma: Inglês

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Spectral distribution of wave energy dissipation by salt marsh vegetation

Jadhav, Ranjit S. ; Chen, Qin ; Smith, Jane M.

Kidlington: Elsevier B.V

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