| 藏东高原浅丘红层区泥石流发育特征及活动性 |
| 投稿时间：2024-03-07 修订日期：2024-04-20 点此下载全文 |
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| 中文摘要:藏东贡觉县浅丘红层区降雨条件有限,泥石流发生、发展主要受控于物源条件及沟道条件,属“物源控制型”泥石流。通过地质调查及统计分析的方法,详细分析了泥石流形成条件、形成机制及活动特征。取得以下结论：(1)流域面积小于1km、沟道纵比降100‰~300‰的沟道容易发生泥石流(2)受构造、冻融风化及含石膏岩的影响,泥石流物源相对丰富,物源类型以坡面侵蚀为主,具有“点多面广”的分布特征,补给形式表现为“零存整取”的特征(3)受控于物源补给形式,泥石流形成主要包括：坡面冲刷起动→沟床汇聚堆积→揭底侵蚀三个阶段(4)受物质来源的影响,区内泥石流流体性质以粘性-过渡型为主(5)泥石流具有中高频率、单次泥石流规模较小的活动特征,历史泥石流具有规模逐渐减小的活动趋势。 |
| 中文关键词:藏东高原 泥石流 形成机制 活动特征 |
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| Developmental characteristics and activity of debris flow in mudstone area of shallow hills of the eastern Tibetan Plateau |
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| Abstract:The rainfall conditions in the shallow hilly red bed area of Gongjue County, eastern Tibet are limited. The occurrence and development of debris flow are mainly controlled by material source conditions and gully conditions. It is a "material source controlled" debris flow. Through the methods of geological survey and statistical analysis, the formation conditions, formation mechanism and activity characteristics of debris flow are analyzed in detail. The following conclusions are obtained: (1) the gully with a drainage area of less than 1km and a longitudinal gradient of 100 ‰ ~ 300 ‰ is prone to debris flow (2) due to the influence of structure, freeze-thaw weathering and gypsum rock, the debris flow material source is relatively rich, the material source type is mainly slope erosion, with the distribution characteristics of "multiple points and wide areas", and the supply form is characterized by "zero deposit and lump sum withdrawal" (3) controlled by the material source supply form, The formation of debris flow mainly includes three stages: slope scouring and starting → gully bed accumulation → bottom opening erosion. (4) affected by the material source, the fluid properties of debris flow in the area are mainly viscous ~ transitional. (5) debris flow has the active characteristics of medium and high frequency and small scale of single debris flow, and the historical debris flow has the active trend of gradually reducing the scale. |
| keywords:eastern Tibetan Plateau tebris flow formation mechanism activity characteristics |
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