气候变化领域集成服务门户(CCPortal): Experimental results of the impact pressure of debris flows in loess regions

CCPortal

DOI	10.1007/s11069-020-04132-3
	Experimental results of the impact pressure of debris flows in loess regions
	Shu H.; Ma J.; Qi S.; Chen P.; Guo Z.Z.; Zhang P.
发表日期	2020
ISSN	0921030X
起始页码	3329
结束页码	3356
卷号	103 期号:3
英文摘要	Debris flow hazards can occur easily in loess regions, due to the particular characteristics of loessic material. Some of them have historically caused considerable damage to both the natural and the human environment. Little research has been conducted into the impact pressures caused by debris flows varying with densities and weights in loess regions. Flume experiments were conducted to estimate the impact pressures of debris flows, and the maximum impact pressure was measured. Moreover, hydrodynamic and hydrostatic models were improved by using these experimental results. Finally, after combining these results with a dimensionless analysis and Buckingham’s π theorem, the Froude number and the Reynolds number were able to be introduced in order to construct a comprehensive dimensionless equation for debris flows. The results showed that the velocity ranged from 1.23 to 3.62 m/s when the debris flow density increased from 1100 to 2300 kg/m3 and the mixture weight rose from 100 to 500 kg. The debris flow depth was between 2.7 and 13.4 cm, and the maximum impact pressure ranged from 1.23 to 28.41 kPa. In addition, the empirical parameters of hydrodynamic and hydrostatic models were modified and valued at 5.08 and 9.48, respectively, which were significantly different from the empirical parameters for earth-rock areas. Specifically, the modified hydrodynamic model and modified hydrostatic model were observed to perform very well for debris flows with comparatively high Froude debris flow numbers. The maximum dimensionless impact pressure was expressed as a power function of both the Froude number and the Reynolds number. A comprehensive maximum dimensionless impact pressure formula for debris flows was coupled with the Froude number and the Reynolds number and expressed as a power function. Results indicated that the modified model and the comprehensive approach can both be applied to the loess regions of China and can provide a better understanding of loess debris flow mechanisms, as well as feed into engineering design work and risk assessments in loess regions affected by debris flows. © 2020, Springer Nature B.V.
关键词	Debris flow Flume Impact pressure Loess Model
英文关键词	debris flow; experimental study; flume experiment; Froude number; hydrodynamics; hydrostatic pressure; loess; Reynolds number; China
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/205938
作者单位	Key Laboratory of Mechanics on Disaster and Environment in Western China, The Ministry of Education of China, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, 730000, China; Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China; State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Faculty of Engineering, China University of Geosciences, Wuhan, 430074, China; Division of Geotechnical Engineering and Geosciences, Department of Civil and Environmental Engineering, UPC BarcelonaTECH, Barcelona, 08034, Spain; Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang, 443002, China
推荐引用方式 GB/T 7714	Shu H.,Ma J.,Qi S.,et al. Experimental results of the impact pressure of debris flows in loess regions[J],2020,103(3).
APA	Shu H.,Ma J.,Qi S.,Chen P.,Guo Z.Z.,&Zhang P..(2020).Experimental results of the impact pressure of debris flows in loess regions.Natural Hazards,103(3).
MLA	Shu H.,et al."Experimental results of the impact pressure of debris flows in loess regions".Natural Hazards 103.3(2020).