Landslides, hurricanes, and sediment sourcing impact basin-scale erosion estimates in Luquillo, Puerto Rico
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
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发表时间：
2021-03-08
影响因子：
5.3
通讯作者：
Caffee, Marc W.
中科院分区：
文献类型：
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作者：
Grande, Alexandra;Schmidt, Amanda H.;Caffee, Marc W.
从河沙中的宇宙成因同位素浓度准确推断侵蚀速率是以浓度在时间上稳定为假设前提的；很少有研究对这一假设进行检验。在波多黎各的玛利亚飓风之后，我们对易发生滑坡的盆地中河流搬运物质的沙粒大小的颗粒上的大气和原地生成的铍 - 10（Be - 10(m)，Be - 10(i)）的时间变异性进行了量化。我们分析了在18个月期间从两个嵌套流域（伊卡科斯流域（3.14平方千米，活动滑坡面积占0.09%）和瓜巴流域（0.11平方千米，活动滑坡面积占1.23%））的河道采集的20个样本。伊卡科斯流域沉积物中的Be - 10(i)浓度随时间保持稳定，而瓜巴流域沉积物中的浓度最初是伊卡科斯流域的一半，并在18个月内呈线性增加，这限制了恢复时间为……
Accurately inferring erosion rates from cosmogenic isotope concentrations in river sand assumes temporally steady concentrations; few studies test this assumption. Following Hurricane Maria in Puerto Rico, we quantified temporal variability in meteoric and in situ Be-10 (Be-10(m), Be-10(i)) 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 km(2), 0.09% active landslide area) and Guaba basins (0.11 km(2), 1.23% active landslide area). Be-10(i) concentrations in Icacos basin sediment remained steady over time whereas concentrations in Guaba basin sediment were initially half those in the Icacos basin and increased linearly over 18 months, constraining recovery time to