气候变化领域集成服务门户(CCPortal): Scale-Dependent Evanescence of River Dunes During Discharge Extremes

CCPortal

DOI	10.1029/2019GL085902
	Scale-Dependent Evanescence of River Dunes During Discharge Extremes
	Naqshband S.; Hoitink A.J.F.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:6
英文摘要	During high river discharge extremes, the growth of dunes can reach a maximum beyond which a transition to upper stage plane bed may occur, enhancing the river's conveyance capacity and reducing flood risk. Our predictive ability of this bedform regime shift in rivers is exclusively built upon high Froude number flows dominated by asymmetric dunes with steep downstream-facing slipfaces that are rare in natural rivers. By using light-weight polystyrene particles as a substrate in an experimental flume setting, we present striking dune morphodynamic similarity between shallow laboratory flow conditions and deep rivers, preconditioned that both flow and sediment transport parameters are accurately scaled. Our experimental results reveal the first observation of upper stage plane bed in a shallow laboratory flume that is reached for a Froude number well below unity. This work highlights the need to rethink widely used dune scaling relationships, bedform stability diagrams, predictions of flow resistance, and flood risk. ©2020. The Authors.
英文关键词	Boats; Froude number; Rivers; Sediment transport; Conveyance capacity; Flow resistance; Polystyrene particle; Predictive abilities; River discharge; Scaling relationships; Stability diagram; Transport parameters; Floods; bedform; environmental risk; flood; morphodynamics; river discharge; sediment transport
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170558
作者单位	Department of Environmental Sciences, Wageningen University, Wageningen, Netherlands
推荐引用方式 GB/T 7714	Naqshband S.,Hoitink A.J.F.. Scale-Dependent Evanescence of River Dunes During Discharge Extremes[J],2020,47(6).
APA	Naqshband S.,&Hoitink A.J.F..(2020).Scale-Dependent Evanescence of River Dunes During Discharge Extremes.Geophysical Research Letters,47(6).
MLA	Naqshband S.,et al."Scale-Dependent Evanescence of River Dunes During Discharge Extremes".Geophysical Research Letters 47.6(2020).