DOI: 10.1029/2017JF004315
Scopus记录号: 2-s2.0-85048589731
论文题名: Soil Particle Transport and Mixing Near a Hillslope Crest: 1. Particle Ages and Residence Times
作者: Furbish D.J. ; Roering J.J. ; Almond P. ; Doane T.H.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 5 起始页码: 1052
结束页码: 1077
语种: 英语
英文关键词: hillslope
; particle age
; soil transport
Scopus关键词: hillslope
; particle motion
; residence time
; soil erosion
; spatiotemporal analysis
英文摘要: We examine probabilistic elements of soil particle ages and residence times measured from their entry into the mechanically active soil column, focusing on steady conditions near a hillslope crest, where particles steadily move into and through a soil mantle with fixed thickness in the presence of erosion. Our objective is to clarify consequences of the geometry of the particle trajectories and disturbance-driven mixing in relation to the arrangement of the surfaces through which the particles enter and leave the soil element. We introduce an Eulerian-Lagrangian description of particle motions to characterize effects of a nonuniform (two-dimensional) mean motion with superimposed depth-dependent mixing. With weak mixing, the forms and moments of the probability distributions of particle residence times and ages are distinct and are largely controlled by the geometry of the mean particle motion within the soil element. The average particle age is systematically less than the average residence time. These distributions converge to exponential forms with equal means only in the idealized limit of a “well-mixed” system. The analysis provides the foundation for considering particle weathering and chemical losses in relation to residence times and ages and for describing the spatiotemporal structure of tracers, for example, cosmogenic nuclide concentrations and optically stimulated luminescence particle ages, in relation to what these reveal about particle mixing. ©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/113947
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN, United States; Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN, United States; Department of Earth Sciences, University of Oregon, Eugene, OR, United States; Department of Soil and Physical Sciences, Faculty of Agriculture and Life Sciences, Lincoln University, Canterbury, New Zealand
Recommended Citation:
Furbish D.J.,Roering J.J.,Almond P.,et al. Soil Particle Transport and Mixing Near a Hillslope Crest: 1. Particle Ages and Residence Times[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(5)