DOI: 10.1002/grl.50333
论文题名: Hydrodynamic and geomorphic controls on mouth bar evolution
作者: Esposito C.R. ; Georgiou I.Y. ; Kolker A.S.
刊名: Geophysical Research Letters
ISSN: 0094-9143
EISSN: 1944-8874
出版年: 2013
卷: 40, 期: 8 起始页码: 1540
结束页码: 1545
语种: 英语
英文关键词: crevasse splay
; Mississippi River Delta
; mouth bar dynamics
; sediment dynamics
Scopus关键词: Channel bifurcation
; Coarse grains
; crevasse splay
; Geomorphic controls
; Hydrological cycles
; Mississippi river
; Sediment dynamic
; Sedimentary systems
; Coastal zones
; Sedimentary rocks
; Sedimentology
; Stratigraphy
; Sediments
; bar
; crevasse
; experimental study
; hydrological cycle
; landscape evolution
; river system
; sedimentation
; stratigraphy
; Mississippi River
; United States
英文摘要: While river deltas are one of the major repositories for sediments and carbon on Earth, there exists a paucity of field data on the formation of distributary mouth bars - one of their key features. Here we present results from an experiment that tested a model of mouth bar development using hydroacoustic, optical, sedimentary, and geochemical tools on a mouth bar in a crevasse splay near the mouth of the Mississippi River. Our results validate an existing model for mouth bar development, which we extend to explain mouth bar stratigraphy. We propose that changes across a hydrological cycle are important for mouth bar development, resulting in a stratigraphy that has alternating fine and coarse grain sediments. Results also indicate that sand is carried up to 6 km from the main stem of the Mississippi River, despite repeated channel bifurcations, which has important implications for our interpretation of the rock record, understanding of coastal sedimentary systems, and the restoration of large deltas. Key Points We show field data showing seasonal sedimentation and transport on a mouth bar Sedimentation in mouth bars occurs across the hydrographic cycle Crevasse splay channels can transport sand long distances. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877979734&doi=10.1002%2fgrl.50333&partnerID=40&md5=93cee45565b714fa06e5501b64dffab7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6407
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Environmental Sciences, University of New Orleans, New Orleans, LA 70118, United States
Recommended Citation:
Esposito C.R.,Georgiou I.Y.,Kolker A.S.. Hydrodynamic and geomorphic controls on mouth bar evolution[J]. Geophysical Research Letters,2013-01-01,40(8).