气候变化领域集成服务门户(CCPortal): Estimating the contribution of tributary sand inputs to controlled flood deposits for sandbar restoration using elemental tracers, Colorado River, Grand Canyon National Park, Arizona

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DOI	10.1130/B35642.1
	Estimating the contribution of tributary sand inputs to controlled flood deposits for sandbar restoration using elemental tracers, Colorado River, Grand Canyon National Park, Arizona
	Chapman K.A.; Best R.J.; Smith M.E.; Mueller E.R.; Grams P.E.; Parnell R.A.
发表日期	2021
ISSN	167606
起始页码	1141
结束页码	1156
卷号	133 期号:2021-05-06
英文摘要	Completion of Glen Canyon Dam in 1963 resulted in complete elimination of sediment delivery from the upstream Colorado River basin to Grand Canyon and nearly complete control of spring snowmelt floods responsible for creating channel and bar morphology. Management of the river ecosystem in Grand Canyon National Park now relies on dam-release floods to redistribute tributary-derived sediment accumulated on the channel bed to higher-elevation sandbars. Here, we used multivariate mixing analysis of sediment elemental compositions to evaluate the extent to which flood deposits derive from tributary-supplied sand compared to reworked, relict predam sediment. The concentrations of seven major and trace elements (Fe, Ca, K, Ti, Rb, Sr, and Zr) were measured in very fine-, fine-, and medium-grained sand from flood deposits using X-ray fluorescence and interpreted using a Bayesian mixing model to characterize the proportion of sand originating from the Paria River, the only major tributary within the study reach. Flood deposits from the 2013 and 2014 controlled floods contained 69% ± 16% and 84% ±20% Paria River-derived material, respectively, with substantial variation among sites. Based on a sand mass balance, we calculated that under decreasing storage conditions since 1963, ~77%-83% of the annual Paria River sand flux needs to be retained within the mass of active sand stored in Marble Canyon each year to reach the observed concentration of Paria River sand at sample locations. This finding suggests that the use of controlled floods may continue to be effective for sandbar maintenance, provided sand inputs from the Paria River do not decline. © 2021 Geological Society of America. All Rights Reserved.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184673
作者单位	School of Earth and Sustainability, Northern Arizona University, 624 Knoles Drive, Flagstaff, Arizona 86011, United States; Department of Physical Science, Geosciences Program, Southern Utah University, 351 West University Boulevard, Cedar City, Utah 84720, United States; Grand Canyon Monitoring and Research Center, Southwest Biological Science Center, U.S. Geological Survey, 2255 North Gemini Drive, Flagstaff, Arizona 86001, United States
推荐引用方式 GB/T 7714	Chapman K.A.,Best R.J.,Smith M.E.,et al. Estimating the contribution of tributary sand inputs to controlled flood deposits for sandbar restoration using elemental tracers, Colorado River, Grand Canyon National Park, Arizona[J],2021,133(2021-05-06).
APA	Chapman K.A.,Best R.J.,Smith M.E.,Mueller E.R.,Grams P.E.,&Parnell R.A..(2021).Estimating the contribution of tributary sand inputs to controlled flood deposits for sandbar restoration using elemental tracers, Colorado River, Grand Canyon National Park, Arizona.Bulletin of the Geological Society of America,133(2021-05-06).
MLA	Chapman K.A.,et al."Estimating the contribution of tributary sand inputs to controlled flood deposits for sandbar restoration using elemental tracers, Colorado River, Grand Canyon National Park, Arizona".Bulletin of the Geological Society of America 133.2021-05-06(2021).