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| Debris flow of Shuangyangzi gully, Dujiangyan City in Wenchuan earthquake area |
| Wu Yufu，Yu Bin，Ma Yu，Zhang Huihui，Chu Shengming，Li Li |
| State Key Laboratory of Geohazards Prevention and Geoenvironment Protection, Chengdu University of Technology, 610059,Chengdu,China |
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Abstract In 2010, the intense rainstorm on 13 August induced debris flow hazard in Dujiangyan City, Sichuan Province, the affecting area of Wenchuan earthquake. This debris flow is the result of both rainfall and earthquake. Therefore, it is significant to make clear of the development characteristics of debris flows by studying its formation and movement process in high seismic intensity area. For discussing the starting way of debris, this paper analyzed the watershed, especially the gully channel characteristics of Shuangyangzi gully based on field survey after the Wenchuan earthquake. Earthquake induced acitive development of disasters as collapse, landslide and provided abundant incompact solid matters, in addition, there are several drop water dams and rockfill dams in the gully. After the H1 landslide on the right bank of Shuangyangzi gully slided and blocked gully channel in case of heavy rainfall under the inducement of the flood, debris flow outburst. It can be concluded that the debris flow could outburst again in the next heavy rainfall.
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Received: 23 February 2011
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