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2008年5月12日汶川地震诱发了黄洞子沟流域规模巨大的大光包滑坡,部分滑体前冲堆积于沟道内,直接为后期泥石流的形成提供了丰富的松散固体物质,改变了黄洞子沟泥石流形成条件,使黄洞子沟从一条非泥石流沟演变成了一条高频泥石流沟。震后黄洞子沟几乎每年雨季都会暴发不同规模的泥石流,其中以2013年“7·09”泥石流灾害规模和危害最大。本文着重分析了黄洞子沟泥石流形成特征,并从地形、降水和地质三个方面将黄洞子沟和文家沟进行对比,得出了物源堆积体颗粒粒径与泥石流形成的关系。
On May 12, 2008, the Wenchuan earthquake induced a large Daguangbao landslide in the Huangtongzigou basin. Some of the slippery bodies were accumulated in the channels, providing abundant loose solid material directly for the formation of debris flow in the later period. Gully debris flow formation conditions, so that Huang Dongzi ditch from a non-debris flow ditch evolved into a high-frequency debris flow ditch. After the earthquake, the Huangtongzi Gully will have different scale debris flows every year in the rainy season. Among them, the size and hazard of debris flow in 2013 are the largest and the worst. This paper analyzes the forming characteristics of debris flow in Huangtongzi Gully and compares the Huangdongzi Gully and Wenjiagou from the aspects of topography, precipitation and geology, and concludes the relationship between the particle size of the source sediment and the formation of debris flow.