Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025883 |
Estimating Bedload From Suspended Load and Water Discharge in Sand Bed Rivers | |
Ashley, T. C.1; McElroy, B.1; Buscombe, D.2; Grams, P. E.3; Kaplinski, M.2 | |
2020-02-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Estimates of fluvial sediment discharge from in situ instruments are an important component of large-scale sediment budgets that track long-term geomorphic change. Suspended sediment load can be reliably estimated using acoustic or physical sampling techniques; however, bedload is difficult to measure directly and can consequently be one of the largest sources of uncertainty in estimates of total load. We propose a physically informed predictive empirical model for bedload sand flux as a function of variables that are measured using existing acoustic or physical sampling techniques. This model depends on the assumption that concentration and grain size in suspension are in equilibrium with reach-averaged boundary conditions. Bayesian inference is used to fit model parameters to data from eight sand-bed rivers and to simulate bedload flux over the available gage record at one site on the Colorado River in Grand Canyon National Park. We find that the cumulative bedload flux during the 9 year period from 2008 to 2016 was 5% of the cumulative suspended sand load; however, instantaneous bedload flux ranged from as little as 1% of instantaneous suspended sand load to as much as 75% of instantaneous suspended sand load due to fluctuations in flow strength and sediment supply. Changes in bedload flux at a constant discharge are indicative of short-term sediment supply enrichment and depletion. Long-term average bedload flux cannot be expected to remain constant in the future as the river adjusts to changes in sediment runoff and the dam-regulated discharge regime. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000535672800015 |
WOS关键词 | SEDIMENT MASS-BALANCE ; COLORADO RIVER ; CONTROLLED FLOODS ; GRAIN-SIZE ; TRANSPORT ; VARIABILITY ; COMPUTATION ; MIGRATION ; ELEVATION ; ARIZONA |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
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/280524 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Wyoming, Dept Geol & Geophys, Laramie, WY 82071 USA; 2.No Arizona Univ, Sch Earth & Sustainabil, Geosci Div, Flagstaff, AZ 86011 USA; 3.US Geol Survey, Southwest Biol Sci Ctr, Grand Canyon Monitoring & Res Ctr, Flagstaff, AZ 86001 USA |
推荐引用方式 GB/T 7714 | Ashley, T. C.,McElroy, B.,Buscombe, D.,et al. Estimating Bedload From Suspended Load and Water Discharge in Sand Bed Rivers[J]. WATER RESOURCES RESEARCH,2020,56(2). |
APA | Ashley, T. C.,McElroy, B.,Buscombe, D.,Grams, P. E.,&Kaplinski, M..(2020).Estimating Bedload From Suspended Load and Water Discharge in Sand Bed Rivers.WATER RESOURCES RESEARCH,56(2). |
MLA | Ashley, T. C.,et al."Estimating Bedload From Suspended Load and Water Discharge in Sand Bed Rivers".WATER RESOURCES RESEARCH 56.2(2020). |
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