| DOI: | 10.1002/2014GL061680
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| 论文题名: | Modes and emergent time scales of embayed beach dynamics |
| 作者: | Ratliff K.M.; Murray A.B.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9696
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| EISSN: | 1944-9427
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| 出版年: | 2014
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| 卷: | 41, 期:20 | | 起始页码: | 7270
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| 结束页码: | 7275
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| 语种: | 英语
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| 英文关键词: | embayed beach
; pocket beach
; shoreline rotation
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| Scopus关键词: | Beaches
; Rotation
; Sediment transport
; Time measurement
; Time series analysis
; Wavelet analysis
; White noise
; Beach sediments
; Breathing modes
; Characteristic time
; Evolution modeling
; External forcing
; Internal systems
; Orthogonal modes
; Wave climates
; Principal component analysis
; beach
; coast
; coastal evolution
; curvature
; embankment
; numerical model
; sediment transport
; shoreline
; timescale
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| 英文摘要: | In this study, we use a simple numerical model (the Coastline Evolution Model) to explore alongshore transport-driven shoreline dynamics within generalized embayed beaches (neglecting cross-shore effects). Using principal component analysis (PCA), we identify two primary orthogonal modes of shoreline behavior that describe shoreline variation about its unchanging mean position: the rotation mode, which has been previously identified and describes changes in the mean shoreline orientation, and a newly identified breathing mode, which represents changes in shoreline curvature. Wavelet analysis of the PCA mode time series reveals characteristic time scales of these modes (typically years to decades) that emerge within even a statistically constant white-noise wave climate (without changes in external forcing), suggesting that these time scales can arise from internal system dynamics. The time scales of both modes increase linearly with shoreface depth, suggesting that the embayed beach sediment transport dynamics exhibit a diffusive scaling. Key Points PCA identifies two main modes of shoreline behavior in numerical coastline modelRotation mode previously recognized, breathing mode newly identifiedWavelet analysis identifies characteristic internal time scales of modes ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911404793&doi=10.1002%2f2014GL061680&partnerID=40&md5=e2fe13afec83474f16ea4624d80fd464
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6960
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, Durham, NC, United States
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| Recommended Citation: | |
Ratliff K.M.,Murray A.B.. Modes and emergent time scales of embayed beach dynamics[J]. Geophysical Research Letters,2014-01-01,41(20).
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