三眼峪特大泥石流堆积特征
Accumulation Characteristics of Sanyanyu Extremely Big Debris Flow
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摘要: 通过野外勘查与试验,认为三眼峪泥石流沟是一个高频泥石流沟,历史上发生多次重大泥石流灾害事件,多期泥石流堆积物在沟道及沟口上下超覆叠置.结合泥石流发生前后遥感影像对比,采用ArcGIS平台进行分析,"8.8"特大泥石流一次最大冲出固体物质总量达152.18×104m3,所到之处房毁江堵,并形成长约1.9km的狭长堆积,堆积量110.58×104m3,最大堆积厚度达10.8m.因泥石流堆积特征是泥石流发生、发展、活动过程的客观记录,分析了三眼峪早期和"8.8"泥石流在不同部位的堆积特征和破坏程度,为泥石流综合整治和灾后重建规划提供参考.Abstract: Based on site investigation and tests,it is found that Sanyanyu is a high-frequency debris flow gully with many catastrophic debris flow occurred in history.Debris flow deposits of different periods overlay each other.By comparing the remote sensing images before and after the debris flow and taking ArcGIS as an analyzing tool,it is found that "8.8" extremely big debris flow carries large amount of solids with a total volume of 152.18×104m3,damaging buildings and blocking rivers.It forms 1.9km long narrow deposits with a volume of 110.58×104m3 and the maximum accumulation thickness of 10.8m.For accumulation characteristics of debris flows are the objective records of the beginning and developing process of debris flows,this paper analyzes accumulation characteristics and destruction degrees in different parts of earlier debris flows and "8.8" debris flow.The results can be taken as references for comprehensive treatment and post-disaster reconstruction planning.
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Keywords:
- debris flow /
- historical disaster /
- earlier deposits /
- accumulation characteristics /
- Zhouqu
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