Characteristics of Debris Flow Hazard of the Liquantai Gully in Longchi Town of Dujiangyan County, Sichuan Province
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Abstract:
After the May 12th Wenchuan Earthquake, the rainstorm caused the group debris flow hazards in Longchi Town of Dujiangyan County，Sichuan Province，which brought a lot of difficulty to the post-disaster reconstruction work. The Liquantai gully debris flow located in Longchi town was selected in the study, and its characteristics were determined through the field investigation, laboratory analysis, and calculation of static and dynamic parameters of debris flow such as the stress yield, flow rate, bulk density, and total outflow. The results showed that (1) the Wenchuan Earthquake generated lots of landslides, which were the supply for debris flow, especially under rainstorm conditions; (2) the Liquantai gully debris flow had the features such as steep channel, large flow, and concealed occurrence; and (3) the bulk density and stress yield of the Liquantai gully debris flow were large, which can not only cause damages to the infrastructure but also generate secondary disaster such as blocking river. The results indicated that the engineering measures need to be performed at the elevation range of 1400 to 1600 m, and the threshold value of precipitation was used for the monitoring and early-warning of the Liquantai gully debris flow.
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