连山大桥泥石流沟灾害特征分析

2013年7月10日和7月12日在强降雨的作用下,连山大桥泥石流沟连续两次发生泥石流,造成都汶高速公路和G213线200 m长度范围内堆积泥石流约8万m3,汶川至都江堰的交通中断。以连山大桥泥石流沟为研究对象,分别从流域因素、物源和水源这三个方面分析泥石流的形成原因,并分析泥石流的成灾过程机制,以及计算泥石流的运动参数和泥石流发展趋势及影响范围,提出防治工程措施。

Analysis on Disaster Characteristics of Debris Flow Gully at Lianshan Bridge

On July 10 and 12, 2013, under the action of heavy rainfall, there happened debris flow twice at the debris flow gully at Lianshan Bridge, leading to about 80 000 m3 accumulation in 200 m long along Dujiangyan-Wenchuan Highway and Line G213, as the result, the traffic from Wenchuan to Dujiangyan was interrupted. This paper, taking the debris flow gully at Lianshan Bridge as the study object, analyzed not only the causes of formation from the watershed factors, and the sources of material and water, but also the mechanism of disaster development, then calculated the kinematic parameter of debris flow and its trend and coverage, at last, proposed the prevention measures.