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都汶公路地处“5.12”汶川大地震的极震区,地震造成大量的崩塌、滑坡、泥石流等次生山地灾害。沿线大多数沟谷都具备暴发泥石流的条件,震后10~20 a将处于泥石流活跃期,尤其前5年泥石流异常活跃。通过野外考察和高分辨率遥感影像数据,获得研究区泥石流沟的基础数据,对比分析建立了震后泥石流总量计算方程,并以泥石流总量和沟床比降作为参数,建立了单沟泥石流危险性评价模型,进行泥石流沟危险性评价。对研究区29条泥石流沟的评价表明:泥石流沟大部分处于中度危险以上,中度危险、高度危险与极高度危险的沟谷占79.31%,其中极高度危险区占20.7%。危险性最大的沟谷为郭竹铺沟、马埝坪沟、野牛沟、一碗水沟和高店子沟,其次是新桥沟、千斤沟、粉丹沟和茨里沟。灾后重建应倍加重视,做好泥石流的预测、预报及防治。
Du Wen highway is located in the “5.12 ” Wenchuan earthquake in the earthquake zone, the earthquake caused a large number of landslides, debris flows and other secondary mountain hazards. Most of the valleys along the line have the conditions of outbreak of mudslides. After 10 ~ 20 days after the earthquake, they will be in an active phase of debris flow, especially in the first 5 years. Through field investigation and high-resolution remote sensing image data, the basic data of debris flow ditch in the study area were obtained. Based on the comparison and analysis, the total debris flow calculation equation was established. Taking the total debris flow and ditching ratio as the parameters, a single debris flow Risk assessment model for debris flow hazard assessment. The evaluation of 29 debris flow ditches in the study area shows that most of the debris flow ditches are above moderate risk, accounting for 79.31% of the moderately dangerous, highly dangerous and highly dangerous ditches, of which 20.7% are extremely highly dangerous. The most dangerous gullies are Guozhu ditch, Ma 埝 ping ditch, Ye Niu ditch, a bowl of ditches and Gaodianzi ditch, followed by Xinqiao ditch, Qianqin ditch, Fendan ditch and Craggy ditch. Reconstruction after the disaster should pay more attention to debris flow forecast, forecast and prevention.