气候变化领域集成服务门户(CCPortal): Landslides, hurricanes, and sediment sourcing impact basin-scale erosion estimates in Luquillo, Puerto Rico

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DOI	10.1016/j.epsl.2021.116821
	Landslides, hurricanes, and sediment sourcing impact basin-scale erosion estimates in Luquillo, Puerto Rico
	Grande A.; Schmidt A.H.; Bierman P.R.; Corbett L.B.; López-Lloreda C.; Willenbring J.; McDowell W.H.; Caffee M.W.
发表日期	2021
ISSN	0012821X
卷号	562
英文摘要	Accurately inferring erosion rates from cosmogenic isotope concentrations in river sand assumes temporally steady concentrations; few studies test this assumption. Following Hurricane María in Puerto Rico, we quantified temporal variability in meteoric and in situ 10Be (10Bem, 10Bei) on sand-sized grains of riverine transported material in landslide-prone basins. We analyzed 20 samples collected over 18 months from the channels of two nested watersheds: the Icacos (3.14 km2, 0.09% active landslide area) and Guabá basins (0.11 km2, 1.23% active landslide area). 10Bei concentrations in Icacos basin sediment remained steady over time whereas concentrations in Guabá basin sediment were initially half those in the Icacos basin and increased linearly over 18 months, constraining recovery time to <2 yrs for this basin. 10Bem concentrations in both drainages did not change consistently over time and were not related to precipitation events; 210Pbex and 137Cs were below detection limits in all samples. Our data demonstrate that 10Bei concentrations in river sand can be lowered for months to years after major landscape disturbing events, such as large or extensive mass movements. Sampling soon after a landslide will result in over-estimates of long-term erosion rates. Such bias can be reduced by repeated sampling over time and by sampling numerous similar watersheds of different sizes and different concentrations of landslides in a study area. © 2021 Elsevier B.V.
关键词	10Be cosmogenic nuclides geomorphology landslides temporal variance
英文关键词	Erosion; Geomorphology; Hurricanes; Landslides; Sediments; Watersheds; $+10$/Be; Active landslides; Basin sediments; Cosmogenic nuclides; Erosion rates; Geomorphology; Landslide areas; Puerto Rico; River sands; Temporal variance; Isotopes; beryllium isotope; concentration (composition); cosmogenic radionuclide; erosion rate; failure mechanism; hurricane; isotopic composition; landslide; slope failure; Icacos Basin; Puerto Rico
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203106
作者单位	Department of Geology, Oberlin College, Oberlin, OH, United States; Rubenstein School of the Environment and Natural Resources, University of Vermont, Burlington, VT, United States; Department of Geology, University of Vermont, Burlington, VT, United States; Gund Institute for the Environment, University of Vermont, Burlington, VT, United States; Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, United States; Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States; Department of Geosciences, Stanford University, Stanford, CA, United States; Department of Physics and Astronomy, Purdue University, West Lafayette, IN, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States
推荐引用方式 GB/T 7714	Grande A.,Schmidt A.H.,Bierman P.R.,et al. Landslides, hurricanes, and sediment sourcing impact basin-scale erosion estimates in Luquillo, Puerto Rico[J],2021,562.
APA	Grande A..,Schmidt A.H..,Bierman P.R..,Corbett L.B..,López-Lloreda C..,...&Caffee M.W..(2021).Landslides, hurricanes, and sediment sourcing impact basin-scale erosion estimates in Luquillo, Puerto Rico.Earth and Planetary Science Letters,562.
MLA	Grande A.,et al."Landslides, hurricanes, and sediment sourcing impact basin-scale erosion estimates in Luquillo, Puerto Rico".Earth and Planetary Science Letters 562(2021).