气候变化领域集成服务门户(CCPortal): A Mixed Length Scale Model for Migrating Fluvial Bedforms

CCPortal

DOI	10.1029/2019GL086625
	A Mixed Length Scale Model for Migrating Fluvial Bedforms
	Guala M.; Heisel M.; Singh A.; Musa M.; Buscombe D.; Grams P.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	With the expansion of hydropower, in-stream converters, flood-protection infrastructures, and growing concerns on deltas fragile ecosystems, there is a pressing need to evaluate and monitor bedform sediment mass flux. It is critical to estimate real-time bedform size and migration velocity and provide a theoretical framework to convert easily accessible time histories of bed elevations into spatially evolving patterns. We collected spatiotemporally resolved bathymetries from laboratory flumes and the Colorado River in statistically steady, homogeneous, subcritical flow conditions. Wave number and frequency spectra of bed elevations show compelling evidence of scale-dependent velocity for the hierarchy of migrating bedforms observed in the laboratory and field. New scaling laws were applied to describe the full range of migration velocities as function of two dimensionless groups based on the bed shear velocity, sediment diameter, and water depth. Further simplification resulted in a mixed length scale model estimating scale-dependent migration velocities, without requiring bedform classification or identification. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Flood control; Velocity; Dimensionless groups; Evolving patterns; Flood protection; Frequency spectra; Migration velocity; Shear velocities; Subcritical flow; Theoretical framework; Shear flow; bathymetry; bedform; fluvial landform; particle size; real time; sediment transport; sedimentation; size distribution; spatiotemporal analysis; water depth; Colorado River [North America]
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/170006
作者单位	St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN, United States; Civil, Environmental and Geological Engineering, University of Minnesota, Minneapolis, MN, United States; Civil, Environmental and Construction Engineering, University of Central Florida, Orlando, FL, United States; Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States; School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ, United States; U.S. Geological Survey, Southwest Biological Science Center, Grand Canyon Monitoring and Research Center, Flagstaff, AZ, United States
推荐引用方式 GB/T 7714	Guala M.,Heisel M.,Singh A.,et al. A Mixed Length Scale Model for Migrating Fluvial Bedforms[J],2020,47(15).
APA	Guala M.,Heisel M.,Singh A.,Musa M.,Buscombe D.,&Grams P..(2020).A Mixed Length Scale Model for Migrating Fluvial Bedforms.Geophysical Research Letters,47(15).
MLA	Guala M.,et al."A Mixed Length Scale Model for Migrating Fluvial Bedforms".Geophysical Research Letters 47.15(2020).