天山阿拉沟泥石流考察初报

INVESTIGATION OF DEBRIS FLOW IN ALAGOU BASIN TIANSHAN MOUNTAINS

据野外考察分析表明,本区以中小型泥石流为主,具有危害范围广、群发性强、低频率的特点.泥石流形成区地形陡峭.山体破碎.是泥石流活动的有利场所,岩石破碎、机械风化强烈为泥石流提供了物质条件.而阵发性大降水是泥石流形成的诱发因子。

According to our investigation in Alagou Basin of Tianshan Mountains, the debrisflow of this area possessed mainly a series of charaters, such as:wide scope of harm, numer-ous outburst. lower frequency, high energy, different scale. There are more than 140 debris flow gullies at least in this area. They distributed bothsides along Alagou river basin, types of debris flow consisted-mainly of gully debris flow,and slope debris flow,dominant factors of the outbrust of debris flow included several as-pects mainly: 1.Steep topography and broken mountain suplly favourable place for the outburstof debris flow. 2. Abundant solid materials suplly the material condition for the outburst of debrisflow. 3. The condition of moisture is the dominant condition of the debris flow outburst.