舟曲县三眼峪沟特大型泥石流的形成和运动特征

Formation and kinematic characteristics of the debris flow disaster at the Sanyanyu gulley,Zhouqu County of Gansu Province

摘要: 2010年8月8日凌晨,舟曲县城北侧三眼峪沟和罗家峪沟暴发了自1949年以来强度最大的特大山洪泥石流灾害。本文基于现场调查,对三眼峪沟泥石流的运动特征进行了分析。该流域泥石流的特征显示,三眼峪沟"8.8"泥石流在流域中游已基本形成,但是,由于沟谷不同地段沟谷形态及固体物质的特征不同,泥石流在冲淤和流量方面差异显著。三眼峪沟的两个支沟汇合后,泥石流流量迅速增大,但其最大峰值流量未形成叠加,主沟出山口处最大峰值流量达1833.18m3/s。

Abstract: Debris flow occurred in the early morning of October 8,2010 at the Sanyanyu Gulley and Luojiayu Gulley,Zhouqu County in Gansu Province has been the most destructive debris flow event in China since 1949.In this paper,characteristics of the debris flow in Sanyanyu Gulley are analyzed in terms of its formation conditions and kinematics based on a site investigation immediately after the disaster.It is found that initiation of the debris flow was in the middle reach of the Sanyanyu basin,and that k...