DOI: 10.1002/2017JF004325
Scopus记录号: 2-s2.0-85041204633
论文题名: Nonlocal Sediment Transport on Steep Lateral Moraines, Eastern Sierra Nevada, California, USA
作者: Doane T.H. ; Furbish D.J. ; Roering J.J. ; Schumer R. ; Morgan D.J.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 1 起始页码: 187
结束页码: 208
语种: 英语
英文关键词: hillslope
; nonlocal transport
; sediment entrainment
英文摘要: Recent work has highlighted the significance of long-distance particle motions in hillslope sediment transport. Such motions imply that the flux at a given hillslope position is appropriately described as a weighted function of surrounding conditions that influence motions reaching the given position. Although the idea of nonlocal sediment transport is well grounded in theory, limited field evidence has been provided. We test local and nonlocal formulations of the flux and compare their ability to reproduce land surface profiles of steep moraines in California. We show that nonlocal and nonlinear models better reproduce evolved land surface profiles, notably the amount of lowering and concavity near the moraine crest and the lengthening and straightening of the depositional apron. The analysis provides the first estimates of key parameters that set sediment entrainment rates and travel distances in nonlocal formulations and highlights the importance of correctly specifying the entrainment rate when modeling land surface evolution. Moraine evolution associated with nonlocal and nonlinear transport formulations, when described in terms of the evolution of the Fourier transform of the moraine surface, displays a distinct behavior involving growth of certain wave numbers, in contrast to the decay of all wave numbers associated with linear transport. Nonlinear and nonlocal formulations share key mathematical elements yielding a nonlinear relation between the flux and the land surface slope. ©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/114781
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; Division of Hydrologic Sciences, Desert Research Institute, Reno, NV, United States
Recommended Citation:
Doane T.H.,Furbish D.J.,Roering J.J.,et al. Nonlocal Sediment Transport on Steep Lateral Moraines, Eastern Sierra Nevada, California, USA[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(1)