DOI: 10.1002/2015GL063159
论文题名: Grain size effects on energy delivery to the streambed and links to bedrock erosion
作者: Turowski J.M. ; Wyss C.R. ; Beer A.R.
刊名: Geophysical Research Letters
ISSN: 0094-8839
EISSN: 1944-8570
出版年: 2015
卷: 42, 期: 6 起始页码: 1775
结束页码: 1780
语种: 英语
英文关键词: energy delivery to the channel bed
; Erlenbach
; fluvial bedrock erosion
; grain size distribution
; saltation-abrasion model
Scopus关键词: Abrasion
; Erosion
; Grain size and shape
; Sediment transport
; Size distribution
; Bedrock erosion
; Channel bed
; Combining method
; Erlenbach
; Field measurement
; Grain size distribution
; Grain size effect
; Largest grain sizes
; Energy efficiency
; bedload
; bedrock
; erosion rate
; grain size
; saltation
; stream bed
; transport process
英文摘要: Fluvial bedrock erosion rates are thought to be proportional to the energy delivered to the channel bed by impacting bed load particles. Combining methods for field measurements of impact energy and for automatic sensing of grain size distributions in the instrumented channel of the Erlenbach, we show that the larger a bed load grain is, the more efficient it is in transferring energy to the streambed. On average, the largest grain size class contributes only 9% to the total bed load mass but is responsible for more than 40% of the energy delivery. This effect may help to explain the predominance of extreme floods, when large grains are mobile, in driving long-term erosion. While the mechanistic saltation-abrasion model accounts for hydraulic forcing of energy delivery, the observed grain size effect is not captured. We suggest that the discrepancy arises from differing transport modes (rolling, sliding, and saltation) not currently captured in modeling. Key Points Can measure grain size-dependent energy delivery in the field Grains size strongly controls energy delivery to the bed Large grains are disproportionally efficient in delivering energy to the bed ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927779406&doi=10.1002%2f2015GL063159&partnerID=40&md5=fdd4a74f6590deb1350da45be9828132
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8455
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: German Research Centre for Geosciences, Potsdam, Germany
Recommended Citation:
Turowski J.M.,Wyss C.R.,Beer A.R.. Grain size effects on energy delivery to the streambed and links to bedrock erosion[J]. Geophysical Research Letters,2015-01-01,42(6).