DOI: 10.1016/j.quascirev.2012.11.013
Scopus记录号: 2-s2.0-84873900755
论文题名: Floodplain construction of the Rio Grande at El Paso, Texas, USA: Response to Holocene climate change
作者: Hall S.A. ; Peterson J.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 65 起始页码: 102
结束页码: 119
语种: 英语
英文关键词: Alluvial chronology
; Fluvial geomorphology
; Holocene
; Paleoclimatology
; Rio Grande
; Texas
Scopus关键词: Alluvial chronology
; Fluvial geomorphology
; Holocenes
; Paleoclimatology
; Rio Grande
; Texas
; Banks (bodies of water)
; Climate change
; Deposition
; Floods
; Sand
; Sediments
; Stream flow
; Volcanic rocks
; Rivers
; braided river
; climate change
; floodplain
; fluvial geomorphology
; meander
; Mollisol
; Neoglacial
; overbank flow
; paleoclimate
; paleosol
; Pleistocene
; prehistoric
; rock glacier
; streamflow
; Audubon County
; El Paso
; Iowa
; Rio Grande [North America]
; Rocky Mountains
; Texas
; United States
英文摘要: The Rio Grande is one of the larger rivers in North America, and the development of its floodplain is related to Holocene climate and climate change. The late Pleistocene through early Holocene channel is characterized by a meander or braided system with lateral cutting and backfilling, resulting in the valley-wide deposition of massive to cross-bedded, fine-to-medium textured sand. The late Pleistocene-early Holocene floodplain is also the sand source for the adjacent Bolson sand sheet. The sand sheet stopped accumulating new sand 5000 yrs ago, an event directly related to the shutting off of the sand supply caused by the deposition of overbank muds that covered and sealed the floodplain surface. During the middle Holocene, the river may have dried intermittently with the floodplain becoming deflated and local sand dunes forming on the floodplain. After 5000 yrs the climate was less arid and the river shifted to a regime of increased flooding and overbank deposition of silt and clay. By 2500 yrs, a late Holocene period of wet climate resulted in further overbank deposition and the formation of a cumulic Mollisol across the floodplain, the Socorro paleosol. The period of wet climate corresponds to the Audubon Neoglacial and active rock glaciers in the southern Rocky Mountains, speleothem growth in nearby caves, and other evidence for wet-cool conditions in the region. After 1000 yrs, the climate became drier, and the deposition and accumulation of overbank muds by the flooding Rio Grande came to a halt. Even though the river has flooded often in historic times, and presumably during late prehistoric times as well, there is little evidence for deposition of overbank sediments on the floodplain since A.D. 1000. Accordingly, the present-day surface of the Lower Valley is ten centuries old. Three channels occur on the US side of the Lower Valley floodplain, and during the past 2500 yrs stream flow has shifted from one to the other by the avulsion process of channel reoccupation, although most flow has been in the Rio Grande channel, the largest of the three. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60684
Appears in Collections: 过去全球变化的重建
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作者单位: Red Rock Geological Enterprises, 3 Cagua Road, Santa Fe, NM 87508, United States; Graduate Studies, Sponsored Programs and Research, University of Guam, Mangilao, GU 96923, United States; University of Guam, P.O. Box 5354, UOG Station, Mangilao, GU 96923-5354, United States
Recommended Citation:
Hall S.A.,Peterson J.A.. Floodplain construction of the Rio Grande at El Paso, Texas, USA: Response to Holocene climate change[J]. Quaternary Science Reviews,2013-01-01,65