标题：Catastrophe process of outburst debris flow triggered by the landslide dam failure

入藏号：WOS:000790530300003

中国科学院文献情报中心期刊分区：地球科学1区/TOP（2022年升级版）

本校作者：常鸣，罗超鹏，武彬彬，向兰兰

来源出版物：JOURNAL OF HYDROLOGY  卷: 609  文献号: 127729

出版年：2022

第一地址：成都理工大学

关键词：Outburst debris flow; Numerical simulation; Flow amplification effect; Obstructive coefficient

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摘要：Strong earthquakes can induce large amounts of loose solid materials, forming landslide dams and blocking narrow flow channels. Under extreme rainfall conditions, instability can lead to an outburst of debris flow once the landslide dam has formed it. On July 10, 2013, a volume of 4.5 x 10(4) m(3) of debris flow occurred in the Yangling gully, Wenchuan County, China. This event can be categorized as an outburst of the debris flow that might seriously threaten valley residents, existing sediment transport countermeasure works, and road infrastructures. This paper describes a typical outburst of debris flow, calculates its obstructive coefficient, simulates the process under various recurrence intervals, and analyzes the efficacy of a new mitigation project.Related research results have laid the foundation for further study of the risk assessment and early warning of debris flow due to landslide dam failure. In this paper, an accurate computational model for the obstructive coefficient, closely related to the flow amplification effect, is established based on a dam break's physical experiments. Combined with the numerical calculation method, the movement process of the Yangling gully was simulated under the old artificial dam and the flow channel engineering conditions. By comparing the measured and the simulated accumulation area, the verification results illustrate that the accumulation area considering the obstructive coefficient model is closer to the measured value. Based on the obstructive coefficient computational model, the results illustrate the outburst of debris flow discharge for various recurrence intervals (50, 100, and 200 years respectively) to perform scenario simulations of Yangling gully under the new mitigation project conditions.

文章链接地址:https://www.sciencedirect.com/science/article/pii/S0022169422003043+