高寒高海拔山原区沟谷型泥石流成因与特征——以四川省雅江县祝桑景区为例
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国家自然科学基金项目"基于雨型的泥石流发生临界降雨条件及预测模式"(41102226);科技基础性工作专项"西南地形急变带地质灾害综合调查与风险制图"(2011FY110100);中国地质调查局国土资源调查项目"雅江县地质灾害详细调查"(1212010814020)


Formation and Characteristics of Gully-type Debris Flow on Hilly Plateau Planes with Cold Climate and High Altitude of Sichuan Proince -A Case Study of the Zhusang Scenic Spot in Yajiang County of Sichuan Province
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    摘要:

    高寒高海拔山原地区沟谷型泥石流与深切峡谷地区泥石流具有较大差异性。以四川省雅江县祝桑景区泥石流为例,通过实地调查、测绘和泥石流堆积物样品颗粒分析,探讨了高寒高海拔山原地区沟谷型泥石流的成因和特征。研究表明:(1)强日照,大温差等气候条件导致高寒高海拔山原区物理风化作用强烈,土体松散,斜坡稳定性差,物源丰富,对泥石流的形成起到了重要的作用;(2)滑坡转化和沟底侵蚀构成物源补给与泥石流启动的主要方式;(3)泥石流动力条件相对较弱;(4)沟床纵坡曲线总体呈现出上游平缓,中游较陡,而下游至沟口进一步变陡的折线形态,汇水区和形成区分界明显,沟口至主河段平缓,堆积区较长;(5)泥石流堆积物粒度分布相对均匀。

    Abstract:

    There are some differences between the debris flows formed in valley areas and those formed onhilly plateau planes.The formation and characteristics of debris flows in the Zhusang scenic spot in YajiangCounty of Sichuan Proince were studied by field investigation,on-the-spot survey and sieving test.Resultsindicate that:(1)The special climate with intensive sunlight and large difference in temperature plays animportant role in the formation of gully-type debris flows on the hilly plateau planes by making physicalweathering processes intensive,solid deposits loose,slope stability low and supplied materials abundant.(2)Landslide and gully-bed erosion consist of two main material-supplying ways.(3)The dynamic conditions of debris flow are relatively weak.(4)In terms of drainage characteristics,the longitudinal curve takeson a poly-line configuration and the conflux zone and formation zone can be divided obviously.(5)Comparedwith the debris flows in the valley areas,the debris flow deposits on hilly plateau planes are more uniform ingrain size.

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倪化勇,陈绪钰,周维,王德伟,唐业旗.高寒高海拔山原区沟谷型泥石流成因与特征——以四川省雅江县祝桑景区为例[J].水土保持通报,2013,(1):211-215

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  • 收稿日期:2012-02-15
  • 最后修改日期:2012-03-19
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  • 在线发布日期: 2014-11-12
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