DOI: 10.1002/2014GL060008
论文题名: On the mechanisms of low-frequency wave attenuation by muddy seabeds
作者: Torres-Freyermuth A. ; Hsu T.-J.
刊名: Geophysical Research Letters
ISSN: 0094-10157
EISSN: 1944-9888
出版年: 2014
卷: 41, 期: 8 起始页码: 2870
结束页码: 2875
语种: 英语
英文关键词: low-frequency waves
; wave-mud interaction
Scopus关键词: Energy dissipation
; Viscosity
; Bi-spectral analysis
; Competing mechanisms
; Field observations
; Low-frequency waves
; Nonlinear energy transfer
; Wave energy dissipation
; Wave non linearities
; Wave-mud interactions
; Wave energy conversion
; energy dissipation
; mud
; nonlinear wave
; seafloor
; viscosity
; wave attenuation
; wave energy
英文摘要: Low-frequency (LF) wave energy increases as the waves shoal into shallow waters. However, recent field observations reported an unexpected near-shore LF wave energy dissipation on muddy seabeds, which cannot be explained by the classic two-layer formulation. Therefore, this phenomenon has been ascribed to either direct dissipation or nonlinear energy transfer. We investigate, by means of a two-layer nonlinear model, the role of the wave nonlinearity and mud viscosity in controlling these two competing mechanisms of mud-induced LF wave attenuation. Bispectral analysis of the simulated cases reveals the existence of three distinct LF wave attenuation regimes, which determine if the LF wave energy losses are owing to either nonlinear energy transfer or direct dissipation. These regimes can be predicted based on the Ursell number, whereas the mud viscosity controls the amount of energy transfer. The present findings clarify apparent inconsistencies in the literature regarding the mechanisms of LF wave attenuation by mud. Key Points Revealed three different regimes of lf- wave attenuation Direct mud dissipation and wave shoaling incorporated in nonlinear wave model Clarifies apparent inconsistencies in literature about lf-wave attenuation ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899039666&doi=10.1002%2f2014GL060008&partnerID=40&md5=6f5eb7d799f78c5fe6b5a2b2759b4f76
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7421
Appears in Collections: 气候减缓与适应
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作者单位: Laboratorio de Ingeniería y Procesos Costeros, Instituto de Ingeniería, Universidad Nacional Autõnoma de México, Yucatán, Sisal, Mexico
Recommended Citation:
Torres-Freyermuth A.,Hsu T.-J.. On the mechanisms of low-frequency wave attenuation by muddy seabeds[J]. Geophysical Research Letters,2014-01-01,41(8).