globalchange  > 气候变化与战略
DOI: 10.1007/s11069-020-04132-3
论文题名:
Experimental results of the impact pressure of debris flows in loess regions
作者: Shu H.; Ma J.; Qi S.; Chen P.; Guo Z.Z.; Zhang P.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2020
卷: 103, 期:3
起始页码: 3329
结束页码: 3356
语种: 英语
中文关键词: 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
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.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/168737
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


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

Recommended Citation:
Shu H.,Ma J.,Qi S.,et al. Experimental results of the impact pressure of debris flows in loess regions[J]. Natural Hazards,2020-01-01,103(3)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Shu H.]'s Articles
[Ma J.]'s Articles
[Qi S.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Shu H.]'s Articles
[Ma J.]'s Articles
[Qi S.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Shu H.]‘s Articles
[Ma J.]‘s Articles
[Qi S.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.