瓦司沟泥石流特征分析及危险性评价

The characteristics analysis and risk assessment of Wasi gully debris flow

瓦司沟位于汶川映秀镇渔子溪左岸,S303公路在此处以路基形式通过,受2010年8月13日强降雨影响,于次日暴发大型泥石流。堆积体掩埋公路造成交通中断,冲入渔子溪抬高河床。通过对瓦司沟泥石流的形成条件、发育特征的地质地貌演化分析,泥石流流量的雨洪法计算,对其进行危险性评价。

Wasi gully is located on the left bank of Yuzi river in Yingxiu town,and S303 highway passes through the gully by roadbed.Under the influence of heavy rain on August 13,2010,large-scale debris flow outbroke the next day.The debris buried the road and caused traffic interruption.The accumulation body entered the Yuzi river and then uplifted the river bed.According to the geological and geomorphologic evolution analysis on the formation conditions and development feature of Wasi gully debris flow,calculation to the quantity of debris flow by torrential rain and flood has been achieved,and the risk assessment has been made in the research.The result has a significant impact on the reconstruction of the highway.