干旱区生态环境知识资源中心(Arid): Along-Stream Variations in Valley Flank Erosion Rates Measured Using Be-10 Concentrations in Colluvial Deposits From Canyons in the Atacama Desert

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DOI	10.1029/2020GL089961
	Along-Stream Variations in Valley Flank Erosion Rates Measured Using Be-10 Concentrations in Colluvial Deposits From Canyons in the Atacama Desert
	Zavala, Valeria; Carretier, Sebastien; Regard, Vincent; Bonnet, Stephane; Riquelme, Rodrigo; Choy, Sandrine
通讯作者	Zavala, V ; Carretier, S (corresponding author), Univ Toulouse, CNRS, Geosci Environm Toulouse GET, Toulouse, France.
来源期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2021
卷号	48 期号:5
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 Be-10 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 quasilinearly with the valley-bed slope and decreases with the valley width (exponent similar to-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.
英文关键词	Andes Atacama cosmogenic valley widening
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000627892100003
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350420
作者单位	[Zavala, Valeria; Carretier, Sebastien; Regard, Vincent; Bonnet, Stephane; Choy, Sandrine] Univ Toulouse, CNRS, Geosci Environm Toulouse GET, Toulouse, France; [Riquelme, Rodrigo] Univ Catolica Norte, Dept Ciencias Geol, Antofagasta, Chile
推荐引用方式 GB/T 7714	Zavala, Valeria,Carretier, Sebastien,Regard, Vincent,et al. Along-Stream Variations in Valley Flank Erosion Rates Measured Using Be-10 Concentrations in Colluvial Deposits From Canyons in the Atacama Desert[J],2021,48(5).
APA	Zavala, Valeria,Carretier, Sebastien,Regard, Vincent,Bonnet, Stephane,Riquelme, Rodrigo,&Choy, Sandrine.(2021).Along-Stream Variations in Valley Flank Erosion Rates Measured Using Be-10 Concentrations in Colluvial Deposits From Canyons in the Atacama Desert.GEOPHYSICAL RESEARCH LETTERS,48(5).
MLA	Zavala, Valeria,et al."Along-Stream Variations in Valley Flank Erosion Rates Measured Using Be-10 Concentrations in Colluvial Deposits From Canyons in the Atacama Desert".GEOPHYSICAL RESEARCH LETTERS 48.5(2021).