globalchange  > 气候减缓与适应
DOI: 10.1029/2017JF004431
Scopus记录号: 2-s2.0-85052393928
论文题名:
The Advective-Diffusive Morphodynamics of Mixed Bedrock-Alluvial Rivers Subjected to Spatiotemporally Varying Sediment Supply
作者: Zhang L.; Stark C.; Schumer R.; Kwang J.; Li T.; Fu X.; Wang G.; Parker G.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期:8
起始页码: 1731
结束页码: 1755
语种: 英语
英文关键词: advective-diffusive morphodynamics ; bedrock-alluvial river ; channel evolution ; sediment supply
英文摘要: Mountain rivers subject to earthquakes and intense precipitation have highly variable sediment supply rates. Here we consider the morphodynamics of 1-D mixed bedrock-alluvial rivers with temporally varying sediment supply rates. We use a periodic sedimentograph, characterized by short periods of high sediment feed rate and longer periods of low sediment feed rate. We study the problem with a corrected Macroroughness Saltation-Abrasion-Alluviation model. In this model, incision is driven by bedload colliding with bedrock, but incision can be turned off by either zero sediment transport or complete alluviation. The formulation is advective-diffusive, the former capturing upstream-migrating knickpoints and the latter capturing smearing of the sedimentograph downstream. The steady state balance between incision and uplift is characterized by a bedrock slope that varies downstream, exhibiting low values at the upstream end of the domain and higher values farther downstream. Sufficiently far downstream, the bedrock slope approaches that predicted for constant feed rates. The zone of low slope near the feed point corresponds to a pocket (zone of locally depressed bedrock slope) in the longitudinal profile, which is repeatedly drowned in and flushed of sediment. The steady state slope profile of a shorter reach is a truncated version of that of a longer reach. A limiting reach length including the pocket defines a sedimentograph boundary layer, where the effects of sediment feed fluctuation are felt. ©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/113287
Appears in Collections:气候减缓与适应

Files in This Item:

There are no files associated with this item.


作者单位: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China; School of Water Resources and Electric Power, Qinghai University, Xining, China; Division of Hydrologic Sciences, Desert Research Institute, Reno, NV, United States; Lamont-Doherty Earth Observatory of Columbia, University Palisades, Palisades, NY, United States; Department of Civil and Environmental Engineering, University of Illinois Urbana-Champaign, Urbana, IL, United States; Department of Geology, University of Illinois Urbana-Champaign, Urbana, IL, United States

Recommended Citation:
Zhang L.,Stark C.,Schumer R.,et al. The Advective-Diffusive Morphodynamics of Mixed Bedrock-Alluvial Rivers Subjected to Spatiotemporally Varying Sediment Supply[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(8)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Zhang L.]'s Articles
[Stark C.]'s Articles
[Schumer R.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Zhang L.]'s Articles
[Stark C.]'s Articles
[Schumer R.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Zhang L.]‘s Articles
[Stark C.]‘s Articles
[Schumer R.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.