Role of debris flow on the change of 10Be concentration in rapidly eroding watersheds: a case study on the Seti River, central Nepal

doi:10.1007/s11629-016-4282-y

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2017 > Vol14 No.4

	Role of debris flow on the change of 10Be concentration in rapidly eroding watersheds: a case study on the Seti River, central Nepal
	KIM Dong Eun; SEONG Yeong Bae; CHOI Kwang Hee; YU Byung Yong
刊名	Journal of Mountain Science
	2017-04
卷号	14 期号:4 页码:716-730
关键词	Seti River Beryllium-10(10be) Catchment-wide Denudation Rate (Cwdr) Debris Flow Episodic Erosional Processes
ISSN号	1672-6316
DOI	10.1007/s11629-016-4282-y
通讯作者	SEONG Yeong Bae
文献子类	期刊论文
英文摘要	The concentration of cosmogenic 10Be in riverine sediments has been widely used as a proxy for catchment-wide denudation rate (CWDR). One of the key assumptions of this approach is that sediments originating from sub-basins with different erosional histories are well mixed. A tragic debris flow occurred in the Seti River watershed, central Nepal, on May 5, 2012. This catastrophic debris flow was triggered by slope failure on the peak of Annapurna IV and resulted in many casualties in the lower Seti Khola. However, it provided an opportunity to test the assumption of equal mixing of sediments in an understudied rapidly eroding watershed. This study documents the CWDR of 10Be to evaluate the extent of the influence of episodic erosional processes such as debris flow on the spatio-temporal redistribution of 10Be concentrations. Our data show that the debris flow caused little change in CWDR across the debris flow event. In addition to isotopic measurement, we calculated denudation rates by using the modeled concentrations in pre- and post-landslide sediments based on the local 10Be productionrate. The modeled result showed little change across the event, indicating that the debris flow in May 2012 played a minor role in sediment evacuation, despite the rapid erosion in the catchment. Our study concludes that although the 2012 event caused many casualties and severe damage, it was a low-magnitude, high frequency event.
语种	英语
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/18553]
专题	Journal of Mountain Science _Journal of Mountain Science-2017_Vol14 No.4
推荐引用方式 GB/T 7714	KIM Dong Eun,SEONG Yeong Bae,CHOI Kwang Hee,et al. Role of debris flow on the change of 10Be concentration in rapidly eroding watersheds: a case study on the Seti River, central Nepal[J]. Journal of Mountain Science,2017,14(4):716-730.
APA	KIM Dong Eun,SEONG Yeong Bae,CHOI Kwang Hee,&YU Byung Yong.(2017).Role of debris flow on the change of 10Be concentration in rapidly eroding watersheds: a case study on the Seti River, central Nepal.Journal of Mountain Science,14(4),716-730.
MLA	KIM Dong Eun,et al."Role of debris flow on the change of 10Be concentration in rapidly eroding watersheds: a case study on the Seti River, central Nepal".Journal of Mountain Science 14.4(2017):716-730.