干旱区生态环境知识资源中心(Arid): Morphodynamics of supercritical flow in a linked river and delta system, Daihai Lake, Northern China

Arid

DOI	10.1111/sed.12839
	Morphodynamics of supercritical flow in a linked river and delta system, Daihai Lake, Northern China
	Tan, Chengpeng; Plink-Bjorklund, Piret
通讯作者	Tan, CP (corresponding author), Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China. ; Tan, CP (corresponding author), Colorado Sch Mines, Dept Geol & Geol Engn, Golden, CO 80401 USA.
来源期刊	SEDIMENTOLOGY
ISSN	0037-0746
EISSN	1365-3091
出版年	2021
卷号	68 期号:4 页码:1606-1639
英文摘要	Historically, the occurrence of Froude supercritical flow and preservation of its deposits was considered rare in natural systems. Over recent years, a growing body of evidence indicates that Froude supercritical flow is a significant formative flow across the terrestrial and marine landscapes, and responsible for much of the sedimentary record from rivers to deepwater systems. This riverbank, trench, ground penetrating radar and modern riverbed dataset from the Bantanzi stream in the Daihai Lake basin, northern China, documents a linked river and delta succession dominated by sedimentary structures formed by supercritical flow. This study links the sedimentary structures in river deposits to modern bedforms in the dry riverbed, and discusses how the sedimentary structures and the supercritical flow morphodynamics change from the river to the delta front. In addition to well-known decimetre to metre-scale sedimentary structures produced by supercritical flow in the river deposits, centimetre-scale sedimentary structures were found on the delta front that were quantitatively linked to deposition from cyclic step migration, utilizing a theoretical framework. This work further documents two types of clinoform geometries in delta foresets. One of these clinoform geometries is consistent with deltaic processes controlled by hydraulic jumps at the river mouth, and the other with hydraulic jumps at the base of delta foresets. Comparison with flume experiments and quantitative assessment show that ephemeral rivers, like the Bantanzi stream, are likely to produce supercritical flow also on their delta fronts, and link the supercritical flow occurrences to the highly seasonal and intense monsoon precipitation in this semi-arid region. This work sheds light on current fundamental understanding of sediment transport and deposition processes from river to delta and highlights the effect of cyclic steps in these processes.
英文关键词	Cyclic steps flash flood Froude supercritical flow hydraulic condition river and delta deposits
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000615792500001
WOS类目	Geology
WOS研究方向	Geology
来源机构	中国科学院地质与地球物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351753
作者单位	[Tan, Chengpeng] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China; [Tan, Chengpeng; Plink-Bjorklund, Piret] Colorado Sch Mines, Dept Geol & Geol Engn, Golden, CO 80401 USA
推荐引用方式 GB/T 7714	Tan, Chengpeng,Plink-Bjorklund, Piret. Morphodynamics of supercritical flow in a linked river and delta system, Daihai Lake, Northern China[J]. 中国科学院地质与地球物理研究所,2021,68(4):1606-1639.
APA	Tan, Chengpeng,&Plink-Bjorklund, Piret.(2021).Morphodynamics of supercritical flow in a linked river and delta system, Daihai Lake, Northern China.SEDIMENTOLOGY,68(4),1606-1639.
MLA	Tan, Chengpeng,et al."Morphodynamics of supercritical flow in a linked river and delta system, Daihai Lake, Northern China".SEDIMENTOLOGY 68.4(2021):1606-1639.