段家河流域泥石流发育条件与冷水沟泥石流特征

CONDITIONS OF THE DEBRISFLOW DEVELOPMENT IN DUANJIA RIVER AREA AND PROPERTIES OF DEBRISFLOW IN LENGSHUI GULLY

段家河流域雨量丰富,多暴雨,但暴雨水资源比率低。支沟纵坡陡,沟内的砂岩、泥页岩岩体受多期不同方向构造应力作用而破碎、滑坡、崩坍发育,有形成泥石流条件。冷水沟泥石流属低频率、中等规模的泥石流沟,处于相对稳定期,泥石流规模不会有大的变化。

Duanjia River area is abundance of precipitation and stormrain, but rate of stormrain to water resource is low. Gradient of branch gullys are steep. Sandstone and shale in gullys are broken under structure stress fields of several periods and different directions. Landslides and avalanches well developed, supplying rich materials for debris flows. The middle scale and low-friquency debrisflow of Lengshui Gully is relative stable and changes few.