DOI: 10.1002/2016GL069262
论文题名: Hillslope-derived blocks retard river incision
作者: Shobe C.M. ; Tucker G.E. ; Anderson R.S.
刊名: Geophysical Research Letters
ISSN: 0094-9672
EISSN: 1944-9403
出版年: 2016
卷: 43, 期: 10 起始页码: 5070
结束页码: 5078
语种: 英语
英文关键词: bedrock rivers
; erosion
; fluvial geomorphology
; hillslope geomorphology
; landscape evolution
; sediment transport
Scopus关键词: Erosion
; Feedback
; Geomorphology
; Landforms
; Sediment transport
; Stream flow
; Current theories
; Fluvial erosion
; Fluvial geomorphology
; Hillslopes
; Incision rates
; Landscape evolutions
; Mountain rivers
; River profile
; Rivers
英文摘要: The most common detachment-limited river incision models ignore the effects of sediment on fluvial erosion, yet steep reaches of mountain rivers often host clusters of large (>1 m) blocks. We argue that this distribution of blocks is a manifestation of an autogenic negative feedback in which fast vertical river incision steepens adjacent hillslopes, which deliver blocks to the channel. Blocks inhibit incision by shielding the bed and enhancing form drag. We explore this feedback with a 1-D channel-reach model in which block delivery by hillslopes depends on the river incision rate. Results indicate that incision-dependent block delivery can explain the block distribution in Boulder Creek, Colorado. The proposed negative feedback may significantly slow knickpoint retreat, channel adjustment, and landscape response compared to rates predicted by current theory. The influence of hillslope-derived blocks may complicate efforts to extract base level histories from river profiles. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978886804&doi=10.1002%2f2016GL069262&partnerID=40&md5=7888403637a65c4500b68203136e91f4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10635
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: Cooperative Institute for Research in Environmental Science and Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Shobe C.M.,Tucker G.E.,Anderson R.S.. Hillslope-derived blocks retard river incision[J]. Geophysical Research Letters,2016-01-01,43(10).