DOI: 10.1002/2017JF004386
Scopus记录号: 2-s2.0-85046395697
论文题名: A Classification of Clay-Rich Subaqueous Density Flow Structures
作者: Hermidas N. ; Eggenhuisen J.T. ; Jacinto R.S. ; Luthi S.M. ; Toth F. ; Pohl F.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 5 起始页码: 945
结束页码: 966
语种: 英语
英文关键词: clay-laden flow
; debrite
; flow classification
; plug flow
; scaling
; turbidite
Scopus关键词: classification
; clay
; flow structure
; gravity flow
; laminar flow
; sediment transport
; turbidite
; turbulent flow
英文摘要: This study presents a classification for subaqueous clay-laden sediment gravity flows. A series of laboratory flume experiments were performed using 9%, 15%, and 21% sediment mixture concentrations composed of sand, silt, clay, and tap water, on varying bed slopes of 6°, 8°, and 9.5°, and with discharge rates of 10 and 15 m3/hr. In addition to the characteristics of the boundary and plug layers, which have been previously used for the classification of open-channel clay-laden flows, the newly presented classification also incorporates the treatment of the free shear layer. The flow states within the boundary and free shear layers were established using calculation of the inner variable, self-similarity considerations, and the magnitude of the apparent viscosity. Based on the experimental observations four flow types were recognized: (1) a clay-rich plug flow with a laminar free shear layer, a plug layer, and a laminar boundary layer, (2) a top transitional plug flow containing a turbulent free shear layer, a plug layer, and a laminar boundary layer, (3) a transitional turbidity current with a turbulent free shear layer, no plug layer, and a laminar boundary layer, and (4) a fully turbulent turbidity current. A connection between the emplaced deposits and the relevant flow types is drawn and it is shown that a Froude number, two Reynolds numbers, and a dimensionless yield stress parameter are sufficient to associate an experimental flow type with a natural large-scale density flow. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114036
Appears in Collections: 气候减缓与适应
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作者单位: Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands; Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; Marine Geosciences Unit, Ifremer, France; Faculty of Science and Informatics, University of Szeged, Szeged, Hungary
Recommended Citation:
Hermidas N.,Eggenhuisen J.T.,Jacinto R.S.,et al. A Classification of Clay-Rich Subaqueous Density Flow Structures[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(5)