气候变化领域集成服务门户(CCPortal): Study of kinematic characteristics of a rock avalanche and subsequent erosion process due to a debris flow in Wenjia gully, Sichuan, China

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DOI	10.1007/s11069-021-04501-6
	Study of kinematic characteristics of a rock avalanche and subsequent erosion process due to a debris flow in Wenjia gully, Sichuan, China
	Kang C.; Ren D.; Gao X.; Han C.; Wang Y.
发表日期	2021
ISSN	0921030X
起始页码	937
结束页码	964
卷号	106 期号:1
英文摘要	This paper aims to systematically study kinematic characteristics of Wenjiagou rock avalanche triggered by the M8.0 2008 Wenchuan earthquake and one of subsequent debris flows that occurred on August 13, 2010 (8.13 debris flow), using a numerical approach. The kinematic characteristics of the rock avalanche are back-calculated using an energy-based runout model. The erosion process of the subsequent rainfall-induced debris flow is analyzed using a progressive scouring entrainment model incorporated in the energy-based runout model. The results indicate that Wenjiagou rock avalanche traveled farther than most other rock avalanches with a maximum velocity of approximately 73 m/s detected at about 1700 m away from the source zone. The erosion of the 8.13 debris flow mainly occurred right after the dam failure which contributes to more than 97% of the total eroded volume. Besides, four different scenarios, including no blockage of the runoff (scenario I), no dam failure (scenario II), dam failure at the end of precipitation (scenario III), and no erodible material (scenario IV), are supposed to study the effect of the failure of a check dam on the erosion characteristics of the debris flow. The results reveal that the blockage of the channel without failure could reduce 86% of the total volume and the failure of check dams is the main reason for the destructive consequence of the 8.13 debris flow. This paper proposes an approach to explore kinematic characteristics of a rock avalanche and erosion process of the subsequent rainfall-induced debris flows and also innovatively provides a method to indirectly assess mitigation strategies that can be used for the design of mitigation projects. © 2021, The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature.
关键词	Debris flow Deposition Erosion Numerical simulation Rock avalanche
英文关键词	computer simulation; debris flow; deposition; entrainment; gully erosion; rainfall; rock avalanche; scour; Sichuan earthquake 2008; China; Sichuan; Wenchuan
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206314
作者单位	Department of Civil and Environmental Engineering, University of Northern British Columbia, Prince George, Canada; Chengdu Surveying Geotechnical Research Institute Co., Ltd. of MCC, Chengdu, Sichuan, China; Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu, China; Third Institute Geology and Mineral Exploration of Gansu Province Bureau of Geology and Mineral Resources, Lanzhou, Gansu, China
推荐引用方式 GB/T 7714	Kang C.,Ren D.,Gao X.,et al. Study of kinematic characteristics of a rock avalanche and subsequent erosion process due to a debris flow in Wenjia gully, Sichuan, China[J],2021,106(1).
APA	Kang C.,Ren D.,Gao X.,Han C.,&Wang Y..(2021).Study of kinematic characteristics of a rock avalanche and subsequent erosion process due to a debris flow in Wenjia gully, Sichuan, China.Natural Hazards,106(1).
MLA	Kang C.,et al."Study of kinematic characteristics of a rock avalanche and subsequent erosion process due to a debris flow in Wenjia gully, Sichuan, China".Natural Hazards 106.1(2021).