DOI: 10.1002/2015GL066481
论文题名: Modulation of outer bank erosion by slump blocks: Disentangling the protective and destructive role of failed material on the three-dimensional flow structure
作者: Hackney C. ; Best J. ; Leyland J. ; Darby S.E. ; Parsons D. ; Aalto R. ; Nicholas A.
刊名: Geophysical Research Letters
ISSN: 0094-8283
EISSN: 1944-8014
出版年: 2015
卷: 42, 期: 24 起始页码: 10663
结束页码: 10670
语种: 英语
英文关键词: bank erosion
; bank roughness
; near-bank flow field
; slump blocks
Scopus关键词: Erosion
; Flow fields
; Shear stress
; Acoustic Doppler Current
; Bank erosion
; Direct observations
; Roughness elements
; Slump blocks
; Terrestrial laser scanning
; Three dimensional flow field
; Three-dimensional flow structure
; Shear flow
; Acoustic Doppler Current Profiler
; bank erosion
; echo sounder
; erosion rate
; flow field
; flow pattern
; flow structure
; laser method
; river channel
; shear stress
; slumping
; surface roughness
; three-dimensional flow
英文摘要: The three-dimensional flow field near the banks of alluvial channels is the primary factor controlling rates of bank erosion. Although submerged slump blocks and associated large-scale bank roughness elements have both previously been proposed to divert flow away from the bank, direct observations of the interaction between eroded bank material and the 3-D flow field are lacking. Here we use observations from multibeam echo sounding, terrestrial laser scanning, and acoustic Doppler current profiling to quantify, for the first time, the influence of submerged slump blocks on the near-bank flow field. In contrast to previous research emphasizing their influence on flow diversion away from the bank, we show that slump blocks may also deflect flow onto the bank, thereby increasing local shear stresses and rates of erosion. We use our measurements to propose a conceptual model for how submerged slump blocks interact with the flow field to modulate bank erosion. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955191390&doi=10.1002%2f2015GL066481&partnerID=40&md5=187a1c672cac2e74caede1bdb4bf3e41
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7899
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Geography and Environment, University of Southampton, Southampton, United Kingdom
Recommended Citation:
Hackney C.,Best J.,Leyland J.,et al. Modulation of outer bank erosion by slump blocks: Disentangling the protective and destructive role of failed material on the three-dimensional flow structure[J]. Geophysical Research Letters,2015-01-01,42(24).