Mountain Hazard Induced by Wenchuan Earthquake and Its Long-term Development Trends of Ganxi Gully,Beichuan
Mountain Hazard Induced by Wenchuan Earthquake and Its Long-term Development Trends of Ganxi Gully,Beichuan
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发表时间：
2010
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通讯作者：
Zhao Wan-yu
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作者：
Zhao Wan-yu
北川县甘西沟壑共发现汶川地震引发的滑坡91处，总面积10.42平方公里，占全流域面积的28.95%，迄今未发现任何泥石流。 30°～50°，坡度越大，越易发生滑坡。滑坡坡向以南向为主，滑坡海拔以1 000～1 600 m为主，尤其是1 000～1 400 m。滑坡以距北川断裂2 000 m左右或距其他主干1 000 m以内为主。山体灾害多发生在T1f+t地层。甘西沟泥石流的长期发展趋势如下：随着松散颗粒物质和泥石流总量的减少，其活动强度不断减弱，呈现活动-静止相交替，静止期逐渐延长。泥石流活动为震后输送限制系统，其次是输送限制系统之间的过渡型。汶川地震后泥石流将持续活跃10～15年。
About 91 landslides induced by Wenchuan Earthquake were found in the ravine of Ganxi in Beichuan county,with a total area of 10.42 km2,28.95% of the whole drainage area,and without any debris-flow to be found so far.Some laws were found on the gradient,aspect,elevation,distance of rupture,and formation lithology of mountain hazard in Ganxi gully.The gradient of landslides is mostly 30° ～ 50°,and landslides are more likely to occur with the increase of their gradient.The aspect of landslides is mainly south.The altitude of those landslides is primarily 1 000 ～ 1 600 m,especially 1 000 ～ 1 400 m.The majority of landslides are around 2 000 m away from Beichuan fault or within 1 000 m from some other main faults.Most of the mountain hazards occur in the stratum of T1f + t.The long-term development trends of the debris flow in Ganxi gully were as follow.Its strength of activity will keep reducing with the decrease of loose granular materials and total amounts of debris flow.It would present an activity-quiet phase alternately and the quiet period will extend gradually.The debris-flow’s activity is transport-limited system right after the earthquake,followed by the transitional type between transport-limited system and weathering-linmited system and ultimately is weathering-linmited system.The debris flows will keep active about 10 ～ 15 years after Wenchuan earthquake.