Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL089961 |
Along‐stream variations in valley flank erosion rates measured using 10Be concentrations in colluvial deposits from canyons in the Atacama Desert | |
Valeria Zavala; Sé; bastien Carretier; Vincent Regard; Sté; phane Bonnet; Rodrigo Riquelme; Sandrine Choy | |
2021-02-16 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2021 |
英文摘要 | The widening and deepening of river valleys occur at different rates. This co‐evolution is largely undocumented over thousands of years. Uncertainties on incision and widening laws limit the ability of models to reproduce erosion rates and responses to tectonics and climate over geologic timescales. We studied two 1 km‐deep canyons in northern Chile, both characterized by valley widening after the upward migration of a major knickzone but with a diachronous incision initiation. We use 10Be concentrations measured in colluvial deposits to quantify the erosion rates E of along‐stream valley flanks. We observe that E increases in the knickzone, with well‐defined relationships (R2 = 0.7): E increases quasi‐linearly with the valley‐bed slope and decreases with the valley width (exponent ∼‐0.4). Our results suggest that E decreases with time but that valley flank weathering may sustain a significant lateral erosion rate. Our results provide data for testing erosion laws governing valley widening. |
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/315667 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Valeria Zavala,Sé,bastien Carretier,等. Along‐stream variations in valley flank erosion rates measured using 10Be concentrations in colluvial deposits from canyons in the Atacama Desert[J]. Geophysical Research Letters,2021. |
APA | Valeria Zavala.,Sé.,bastien Carretier.,Vincent Regard.,Sté.,...&Sandrine Choy.(2021).Along‐stream variations in valley flank erosion rates measured using 10Be concentrations in colluvial deposits from canyons in the Atacama Desert.Geophysical Research Letters. |
MLA | Valeria Zavala,et al."Along‐stream variations in valley flank erosion rates measured using 10Be concentrations in colluvial deposits from canyons in the Atacama Desert".Geophysical Research Letters (2021). |
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