Case study of a giant debris flow in the Wenjia Gully, Sichuan Province, China

Yu, Bin; Ma, Yu; Wu, Yufu

doi:10.1007/s11069-012-0395-y

Cited by 78 publications

(36 citation statements)

References 16 publications

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“…The large debris flows in the Wenjia Gully on August 13, 2010, is an extreme example of mass movement event, which occurred after the Wenchuan earthquake of May 12, 2008 (Yu et al, 2013). As illustrated by Tang et al (2012), the Wenjia Gully is situated in the Qingping area, part of Mianzhu County in Sichuan Province, China.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Experimental study on the triggering mechanisms and kinematic properties of large debris flows in Wenjia Gully

Zhou

Cui

Tang

et al. 2015

Engineering Geology

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Section: Accepted Manuscriptmentioning

confidence: 99%

“…Yu et al, 2013). At least five debris-flow disaster events occurred in the Wenjia Gully between September 24, 2008 andSeptember 18, 2010 during the three rainy seasons after the Wenchuan earthquake (Tang et al, 2009Ni et al, 2012;Xu, 2010;Yu et al, 2013).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental study on the triggering mechanisms and kinematic properties of large debris flows in Wenjia Gully

Zhou

Cui

Tang

et al. 2015

Engineering Geology

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“…Debris flows are an important process in landscape evolution [1] and pose significant hazards in mountain areas [2,3] . In recent years in China, along with the construction of large-scale hydropower projects in mountainous areas, debris flows have caused heavier losses than before.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Critical Rainfall of the Aizi Gully Baihetan Hydropower Station Near-Zone Area

HeNa¹

2016

ijsrm

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Abstract：At dawn of 28 June 2012, a catastrophic debris flow occurred in Aizi gully near Baihetan hydropower station, resulting in 40 people dead or missing. In addition, the debris flow blocked the main transportation route of Baihetan hydropower station and severely affected the construction progress. After the catastrophic debris flow event, detailed field investigations were conducted. By means of the field investigation, the corresponding catchment parameters that prominently affected the process of debris flow formation were acquired, including the volume and distribution of loose solid materials in the source area, meteorological conditions, topography and landforms, etc. On the basis of field investigations, we predicted that Aizi gully still satisfies debris flows initiation conditions and poses a great possibility for debris flow breakout in the future. Therefore, sufficient accurate prediction and forecasting are the precondition for disaster mitigation and siting mitigation structures in Aizi gully. At present, critical rainfall plays a key role in debris flows prediction. Thus, the main objective of this paper is to obtain the critical rainfall of Aizi gully. An in-situ artificial rainfall experiments were conducted in Aizi gully catchment, and by means of analyzing the experimental results (rainfall, pore water pressure and moisture content) and comprehensively considering the local rainfall conditions, the critical rainfall and pore water pressure of Aizi gully is acquired. The critical rainfall is 32.92mm/24h (accumulative rainfall). On the basis of this threshold, an early warning system can be established in Aizi gully catchment. Thus in turn, the warning information can be released in a timely and accurate way and can reduce the threat caused by debris flow disasters. At the same time, the safety of the construction processes of Baihetan hydropower station can be guaranteed.

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“…Large-scale debris flows were triggered by intensive rainfalls after the 5.12 Wenchuan earthquake, including the Zhouqu debris flow, the Wenjia gully debris flow, and the Hongchun gully debris flow (Wang, 2013;Yu et al, 2013;Tang et al, 2015). On 8 August 2010, a large debris flow occurred in the Luojiayu gully, northern Zhouqu County, Gansu Province.…”

Section: Introductionmentioning

confidence: 99%

“…The flow destroyed six villages, blocked the Bailongjiang River, resulting in the formation of a lake that inundated over half of Zhouqu County, and displaced or killed 1765 people (Cui et al, 2013). Usually, large-scale debris flow events involve substantial erosion upstream (Ni et al, 2012;Yu et al, 2013), and large volumes of solid materials are transported from the initiation zone to downstream areas.…”

Section: Introductionmentioning

confidence: 99%

Effects of <i>Y</i>-type spillway lateral contraction ratios on debris-flowpatterns and scour features downriver of a check dam

Chen

Liu

Zhao

2016

Nat. Hazards Earth Syst. Sci.

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Abstract. Debris flows often cause devastating damage to property and can injure or kill residents in mountainous areas. The construction of check dams in debris-flow valleys is considered a useful strategy for mitigating the damages downstream. In this paper, a new type of spillway structure with lateral contraction was proposed to distribute debris flows after the check dam storage filled up. Four different lateral contraction ratios of the spillway were considered in experiments that investigated debris-flow patterns, scour characteristics, and energy dissipation rates when debris flows passed through the spillway. The results indicated that lateral contraction considerably influenced the extension of debris-flow nappes. The drop length of the nappe at η = 0.7 (η means lateral contraction ratio) was approximately 1.4 times larger than at η = 0.4. The collision, friction, and mixing forces between the debris-flow nappes and debris flows in downstream plunge pools dissipated much of the debris-flow kinetic energy, ranging from 42.03 to 78.08 % at different contraction ratios. Additionally, based on a dimensionless analysis, an empirical model was proposed to predict the maximum scour depth downriver of a check dam. It indicated that the results calculated by the model exhibited good agreement with the experimental results.

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Case study of a giant debris flow in the Wenjia Gully, Sichuan Province, China

Cited by 78 publications

References 16 publications

Experimental study on the triggering mechanisms and kinematic properties of large debris flows in Wenjia Gully

Experimental study on the triggering mechanisms and kinematic properties of large debris flows in Wenjia Gully

Experimental Study of Critical Rainfall of the Aizi Gully Baihetan Hydropower Station Near-Zone Area

Effects of <i>Y</i>-type spillway lateral contraction ratios on debris-flowpatterns and scour features downriver of a check dam

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Case study of a giant debris flow in the Wenjia Gully, Sichuan Province, China

Cited by 78 publications

References 16 publications

Experimental study on the triggering mechanisms and kinematic properties of large debris flows in Wenjia Gully

Experimental study on the triggering mechanisms and kinematic properties of large debris flows in Wenjia Gully

Experimental Study of Critical Rainfall of the Aizi Gully Baihetan Hydropower Station Near-Zone Area

Effects of &lt;i&gt;Y&lt;/i&gt;-type spillway lateral contraction ratios on debris-flowpatterns and scour features downriver of a check dam

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Effects of <i>Y</i>-type spillway lateral contraction ratios on debris-flowpatterns and scour features downriver of a check dam