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Catastrophic debris flows triggered by a 14 August 2010 rainfall at the epicenter of the Wenchuan earthquake

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Abstract

The Wenchuan earthquake of May 12, 2008 produced large amounts of loose material (landslide debris) that are still present on the steep slopes and in the gullies. This loose material creates an important hazard as strong rainfall can cause the development of devastating debris flows that will endanger the resettled population and destroy the result of reconstruction efforts. On 14 August 2010, a total of 21 debris flows were triggered by heavy rainfall around the town of Yingxue, located near the epicenter of the Wenchuan earthquake. One of these debris flows produced a debris dam, which then changed the course of the river and resulted in the flooding of the newly reconstructed Yinxue town. Prior to this catastrophic event, debris flow hazard had been recognized in the region, but its potential for such widespread and devastating impacts was not fully appreciated. Our primary objective for this study was to analyze the characteristics of the triggering rainfall and the sediment supply conditions leading to this event. Our field observations show that even small debris flow catchment areas have caused widespread sediment deposition on the existing fans. It is concluded that the whole of the area shaken by the Wenchuan earthquake is more susceptible to debris flows, initiated by localized heavy rainfall, than had been assumed earlier. The results of this study contribute to a better understanding of the conditions leading to catastrophic debris flow events in the earthquake-hit area. This is essential for the implementation of proper early warning, prevention, and mitigation measures as well as a better land use planning in this area.

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Acknowledgments

This work was supported by the 973 program (no. 2011CB409903), Program of Changjiang Scholars and Innovative Research Team in University (no. IRT0812), and Research Fund of the State Key Laboratory of Geo-Hazard Prevention (no. SKLGP2009Z004). We express our gratitude to Prof. Niek Rengers (ITC) for his comments and suggestions on earlier versions of the manuscript.

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Authors and Affiliations

  1. State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, 610059, China

    Chuan Tang, Jing Zhu, Jun Ding, Xiaofei F. Cui, Lei Chen & Jianshi S. Zhang

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  1. Chuan Tang
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  2. Jing Zhu
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  3. Jun Ding
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Correspondence to Chuan Tang.

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Tang, C., Zhu, J., Ding, J. et al. Catastrophic debris flows triggered by a 14 August 2010 rainfall at the epicenter of the Wenchuan earthquake. Landslides 8, 485–497 (2011). https://doi.org/10.1007/s10346-011-0269-5

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