Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL086625 |
A mixed length scale model for migrating fluvial bedforms | |
M. Guala; M. Heisel; A. Singh; M. Musa; D. Buscombe; P. Grams | |
2020-05-24 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2020 |
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 spatio‐temporally 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. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/270408 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | M. Guala,M. Heisel,A. Singh,et al. A mixed length scale model for migrating fluvial bedforms[J]. Geophysical Research Letters,2020. |
APA | M. Guala,M. Heisel,A. Singh,M. Musa,D. Buscombe,&P. Grams.(2020).A mixed length scale model for migrating fluvial bedforms.Geophysical Research Letters. |
MLA | M. Guala,et al."A mixed length scale model for migrating fluvial bedforms".Geophysical Research Letters (2020). |
条目包含的文件 | 条目无相关文件。 |
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