Protecting highway bridges against debris flows using lateral berms: a case study of the 2008 and 2011 Cheyang debris flow events, China

Qiu, Fei; Huang, Jianling; Li, Yange; Han, Zheng; Wang, Weidong; Chen, Guangqi; Qu, Xia; Su, Bin

doi:10.1080/19475705.2017.1414718

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…To alleviate the loss caused by debris flows, different types of engineering measures have been implemented worldwide, including check dams (Mizuyama 2008;Chen et al 2015), flexible net dams (Canelli et al 2012;Volkwein et al 2015), drainage canals (Takahisa 2008;Brunkal and Santi 2016), debris flow storage basins (Gems et al 2014) and lateral berms (Qiu et al 2017). In China, the following engineering measures are applied: Low check dams are used for bed and bank sediment protection, high check dams are used for debris flow storage, grille dams are used for debris flow storage via particle size sorting, and drainage channels are used for debris flows excretion.…”

Section: Introductionmentioning

confidence: 99%

Debris flow amplification in a moraine terrace and related engineering measures in the Zongzhai Valley, Southeastern Tibetan Plateau

Deng

Liu

Zhang

et al. 2018

Geomatics, Natural Hazards and Risk

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Debris flows can quickly destroy basic facilities in mountainous areas, where suitable land resources are limited and towns are located on gentle slopes. To alleviate the threat of debris flows, two main approaches, based on debris storage or debris-flow excretion, have been proposed in recent decades in China. In August 2015, a debris flow occurred in the Zongzhai Valley for the first time in the last 100 years. Field surveys, section measurements and discharge calculations indicated that the bulking of the debris flow and the sediment entrainment were serious, resulting in the widening and deepening of the channel along the moraine terrace. Therefore, the two traditional mitigation methods appear to be inappropriate for the debris flows in Zongzhai Valley because this region lacks sufficient space for debris storage and economic support for a long drainage canal. This study analyzed the supply mechanism of the bed material and bank sediments along the moraine terrace and found that the bank collapse was mainly controlled by bed scour. Based on a literature review, we determined that the channel bed strength in the terrace should be increased and proposed that shallow dams be constructed to maintain the stability of the channel bed. The parameters of these shallow dams are provided in this article.

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