干旱区生态环境知识资源中心(Arid): Alluvial stratification styles in a large, flash-flood influenced dryland river: The Luni River, Thar Desert, north-west India

Arid

DOI	10.1111/sed.12487
	Alluvial stratification styles in a large, flash-flood influenced dryland river: The Luni River, Thar Desert, north-west India
	Carling, Paul A.; Leclair, Suzanne F.
通讯作者	Carling, Paul A.
来源期刊	SEDIMENTOLOGY
ISSN	0037-0746
EISSN	1365-3091
出版年	2019
卷号	66 期号:1 页码:102-128
英文摘要	Detailed descriptions of the architecture of dryland-river deposits are few, which hinders the understanding of stratigraphic development in aggradational settings. The aim of this study was to obtain new insight into the depositional dynamics and resultant stratigraphy of steep, high-energy dryland rivers in particular. The study site is within the Luni River, the largest river in the Thar Desert, India. A 700m wide section, 5m deep, was logged and the dated-stratification related to the flow regimen. Seasonal discharges may reach 14000m(3)sec(-1) but the bed is usually dry. The deposits consist mainly of sandy upper-stage plane bed lamination and low-angle stratification deposited in supercritical flows with some strata showing gravel-lense antidune signatures. Estimated hydraulic parameters indicate a dominance of the upper-stage plane bed state. Less frequent dune trough cross-sets occur at all depths, yet commonly as isolated sets with erosive upper boundaries. Localized deep scour causes slumping and soft-sediment deformation. Scour holes adjacent to older bedded deposits are rapidly infilled, often by massive deposits. Repeated deep scour results in units of deposition of different ages (50 to 500abp) and different facies found at similar shallow depths (2 to 3m). Older dates (1 to 2kabp) occur in lower strata (4 to 5m depths) at which depths younger units also are preserved locally. The steep, high-energy depositional environment promotes the unusual preservation and predominance of upper-stage facies, in contrast to a relative paucity of lower-stage facies. Frequent local deep-scour during floods means that specific facies rarely can be traced across the river channel for more than a few metres, but are replaced by other facies in close proximity. These results should help interpretation of high-energy sediment deposits widely and improve understanding of the stratigraphic development in modern dryland rivers, and in characterizing oil, gas and groundwater reservoirs in the dryland geological record more generally.
英文关键词	Antidunes dryland river dunes flash-flood fluvial architecture planar stratification upper-stage plane beds
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000459578900005
WOS关键词	SOFT-SEDIMENT DEFORMATION ; STAGE PLANE BEDS ; LATE QUATERNARY ; FLUVIAL SYSTEMS ; COOPER CREEK ; ARID-ZONE ; HAWKESBURY SANDSTONE ; EPHEMERAL STREAMS ; BEDLOAD TRANSPORT ; HYDRAULIC-JUMP
WOS类目	Geology
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218821
作者单位	Henan Univ, Coll Environm & Planning, Kaifeng 475004, Henan, Peoples R China
推荐引用方式 GB/T 7714	Carling, Paul A.,Leclair, Suzanne F.. Alluvial stratification styles in a large, flash-flood influenced dryland river: The Luni River, Thar Desert, north-west India[J],2019,66(1):102-128.
APA	Carling, Paul A.,&Leclair, Suzanne F..(2019).Alluvial stratification styles in a large, flash-flood influenced dryland river: The Luni River, Thar Desert, north-west India.SEDIMENTOLOGY,66(1),102-128.
MLA	Carling, Paul A.,et al."Alluvial stratification styles in a large, flash-flood influenced dryland river: The Luni River, Thar Desert, north-west India".SEDIMENTOLOGY 66.1(2019):102-128.