Statistical and probabilistic analyses of impact pressure and discharge of debris flow from 139 events during 1961 and 2000 at Jiangjia Ravine, China

Hong, Yi; Wang, Jui Pin; Li, Dianqing; Cao, Zi-Jun; Ng, Charles Wang Wai; Cui, Peng

doi:10.1016/j.enggeo.2014.12.011

Cited by 63 publications

(33 citation statements)

References 18 publications

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“…The table shows that the width of the energy dissipation structure varied from 0.3 m to 0.6 m, and the length of the energy dissipation structure section varied from 0.6 m to 1.8 m. An original sample of debris flow materials from the Jiangjia Gully (shown in Fig. 3) was used in the experiment because debris flows from this area are typical of the flows that are found in most mountainous regions of China and exhibit a variety of flow types, patterns, and processes under natural conditions (Jakob and Hungr, 2005;Li et al, 2012;Li et al, 2014;Hong et al, 2015). The particle diameter of the test materials was limited by the use of a 20 mm × 20 mm steel mesh, which rejected particles with diameters N20 mm.…”

Section: Experimental Configurationmentioning

confidence: 99%

An experimental study of dilute debris flow characteristics in a drainage channel with an energy dissipation structure

Chen¹,

Chen²,

Li³

et al. 2015

Engineering Geology

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Section: Experimental Configurationmentioning

confidence: 99%

An experimental study of dilute debris flow characteristics in a drainage channel with an energy dissipation structure

Chen¹,

Chen²,

Li³

et al. 2015

Engineering Geology

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“…38 surges occurede on August 25, 2004 after short intence rainfall mm. Hong et al 2015 Jiangjia Ravine basin, located near the city of Dongchuan (China). the basin has an area of 48.6 km2 and the mainstream has a length of 13.9 km.…”

Section: List Ofmentioning

confidence: 99%

“…their choice was made on the basis of availability of both dynamic information (thickness, velocity and density) and impact features (impact load) and for ensuring that the datasets covered different testing scenarios (soil type, water content, channel slope, magnitude) and different scale approaches. The datasets included values of flow velocity, thickness and impacting peak pressure collected from small scale tests performed in specifically created flumes(Scheidl et al 2013;Cui et al 2015;Ashwood and Hungr 2016;, from full-scale debris flow(DeNatale et al 1999;Bugnion et al 2011) and from monitoring of recurrent debris flow in the Jiangjia Ravine basin in China(Hu et al 2011;Hong et al 2015) and Illgraben debris flow monitoring site in Switzerland(McArdell 2016; Wendeler et al 2007).…”

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confidence: 99%

Design of active debris flow mitigation measures: a comprehensive analysis of existing impact models

Vagnon

2019

Landslides

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Debris flows occur in mountainous areas characterized by steep slope and occasional severe rainstorms. The massive urbanization in these areas raised the importance of studying and mitigating these phenomena. Concerning the strategy of protection, it is fundamental to evaluate both the effect of the magnitude (that concerns the definition of the hazard), in terms of mobilized volume and travel distance, and the best technical protection structures (that concerns the mitigation measures) to reduce the existing risk to an acceptable residual one. In particular, the mitigation measure design requires the evaluation of the effects of debris flow impact forces against them. In other words, once it is established that mitigation structures are required, the impacting pressure shall be evaluated and it should be verified that it does not exceed barrier resistance. In this paper the author wants to focus on the definition and the evaluation of the impacting load of debris flows on protection structures: a critical review of main existing models and equations treated in scientific literature is here presented. Although most of these equations are based on solid physical basis, they are always affected by an empirical nature due to the presence of coefficients for fitting the numerical results with laboratory and, less frequently, field data. The predicting capability of these equations, namely the capability of fitting experimental/field data, is analysed and evaluated using ten different datasets available in scientific literature. The purpose of this paper is to provide a comprehensive analysis of the existing debris flow impact models, highlighting their strong points and limits. Moreover, this paper could have a practical aspect by helping engineers in the choice of the best technical solution and the safe design of debris flow protection structures. Existing design guidelines for debris flow protection barrier have been analysed. Finally, starting from the analysis of the hydro-static model response to fit field data and introducing some practical assumptions, an empirical formula is proposed for taking into account the dynamic effects of the phenomenon.

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“…A more detailed description of laboratory apparatus and instruments can be found in . values for 139 historical events that took place between 1961 and 2000 in the Jiangjia Ravine basin located in the Dongchuan area of Yunnan Province in China (Zhang and Xiong 1997;Kang et al 2006Kang et al , 2007Hong et al 2015). This basin experiences numerous debris flow events each year (up to 28) that cause great damage to local infrastructure (Hong et al 2015).…”

Section: Statistical Analysis Of Laboratory and Real Debris Flow Motimentioning

confidence: 99%

“…values for 139 historical events that took place between 1961 and 2000 in the Jiangjia Ravine basin located in the Dongchuan area of Yunnan Province in China (Zhang and Xiong 1997;Kang et al 2006Kang et al , 2007Hong et al 2015). This basin experiences numerous debris flow events each year (up to 28) that cause great damage to local infrastructure (Hong et al 2015). Debris flows, which mainly occur during the rainy season (June to September), lead to highly fractured rocks and colluvium being eroded and rapidly carried to the valley floor (Zhou and NG 2010).…”

Section: Statistical Analysis Of Laboratory and Real Debris Flow Motimentioning

confidence: 99%

Reliability-based design for debris flow barriers

2019

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In the European Union since 2010, the design of any type of structures must comply with EN-1997 Geotechnical Design (CEN 2004) (EC7) referring to engineering projects in the rock mechanics field. However, the design of debris flow countermeasures in compliance with EC7 requirements is not feasible: EC7 uses partial safety factors for design calculations, but safety factors are not provided for phenomena such as debris flows and rock falls. Consequently, how EC7 can be applied to the design of debris flow barriers is not clear, although the basic philosophy of reliability-based design (RBD), as defined in EN1990 (CEN 2002) and applicable to geotechnical applications, may be a suitable approach. However, there is insufficient understanding of interactions between debris flows and structures to support RBD application to debris flow barrier design, as full-scale experimental data are very limited and difficult to obtain. Laboratory data are available but they are governed by scale effects that limit their usefulness for full-scale problems. The article describes an analysis, using the first-order reliability method (FORM), of two different datasets, one obtained through laboratory experiments and the other reflecting historical debris flow events in the Jiangjia Ravine (China). Statistical analysis of laboratory data enabled a definition of the statistical distributions of the parameters that primarily influence debris flow and barrier interactions. These statistical distributions were then compared to the field data to explore the links between flume experiments and full-scale problems. This paper reports a first attempt to apply RBD to debris flow countermeasures, showing how the choice of the target probability of failure influences the barrier design resistance value. An analysis of the factors governing debris flows highlights the applicability and limitations of EN1990 and EN1997 in the design of these rock engineering structures.

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Statistical and probabilistic analyses of impact pressure and discharge of debris flow from 139 events during 1961 and 2000 at Jiangjia Ravine, China

Cited by 63 publications

References 18 publications

An experimental study of dilute debris flow characteristics in a drainage channel with an energy dissipation structure

An experimental study of dilute debris flow characteristics in a drainage channel with an energy dissipation structure

Design of active debris flow mitigation measures: a comprehensive analysis of existing impact models

Reliability-based design for debris flow barriers

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