DOI: 10.1002/2014GL060519
论文题名: A surfzone morphological diffusivity estimated from the evolution of excavated holes
作者: Moulton M. ; Elgar S. ; Raubenheimer B.
刊名: Geophysical Research Letters
ISSN: 0094-9972
EISSN: 1944-9703
出版年: 2014
卷: 41, 期: 13 起始页码: 4628
结束页码: 4636
语种: 英语
英文关键词: bed slope
; nearshore morphology
; nearshore processes
; sediment transport
; surf zone
Scopus关键词: Bathymetry
; Coastal engineering
; Sediment transport
; Sedimentation
; Shear stress
; Bathymetric features
; Bed slope
; Continuity equations
; Field measurement
; Morphological evolution
; Nearshore process
; Nearshores
; Surf zones
; Diffusion
英文摘要: Downslope gravity-driven sediment transport smooths steep nearshore bathymetric features, such as channels, bars, troughs, cusps, mounds, pits, scarps, and bedforms. Downslope transport appears approximately as a diffusive term in the sediment continuity equation predicting changes in bed level, with a morphological diffusivity controlling the rate of seafloor smoothing. Despite the importance of surfzone sediment transport and morphological evolution, the size of the downslope transport term in nearshore models varies widely, and theories have not been tested with field measurements. Here observations of the infill of large excavated holes in an energetic inner surf zone provide the first opportunity to infer the morphological diffusivity in the field. The estimated diffusion coefficient is consistent with a theoretical bedload morphological diffusivity that scales with the three-halves power of the representative bed shear stress. Key Points Downslope sediment transport is important for smoothing of steep bathymetry Excavated surfzone holes filled at rates correlated with bed shear stress Morphological diffusivity inferred from observations is consistent with theory ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904076941&doi=10.1002%2f2014GL060519&partnerID=40&md5=c74b281b6508a0c7e3a635855fc8a0eb
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7236
Appears in Collections: 气候减缓与适应
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作者单位: Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole MA, United States
Recommended Citation:
Moulton M.,Elgar S.,Raubenheimer B.. A surfzone morphological diffusivity estimated from the evolution of excavated holes[J]. Geophysical Research Letters,2014-01-01,41(13).