ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    雅鲁藏布江中游石冰川发育特征及潜在成灾机制分析

    Developmental Characteristics and Potential Disaster Mechanism of Rock Glaciers in the Middle Reaches of the Yarlung Zangbo River

    • 摘要: 石冰川是以冰岩混合物为基础在重力和冻融作用下形成的一类具有蠕滑特征的冰缘地貌,大量分布于中国青藏高原和天山地区,了解其发育特征对于研究高寒山区环境演化和致灾机理具有重要的理论和现实意义。近年来的监测研究发现,受气候变暖影响,石冰川表面蠕滑出现了显著的加速过程,形成泥石流或滑坡的风险增大。青藏高原是全球气候变暖的敏感区,由气候变暖引起的地质灾害受到广泛关注。鉴于此,笔者采用现场测量、遥感解译和理论分析的方法,分析并探讨了雅鲁藏布江中游桑−加峡谷两岸石冰川的发育特征和潜在成灾机制。结果表明,石冰川的形成和发育与孕育基床的地形、气候和太阳辐射有关,在气温升高、短历时强降雨或强烈地震作用下,石冰川易形成泥石流或滑坡灾害威胁下游,主要表现为石冰川下游段组成物质的不稳定性。

       

      Abstract: Rock glaciers are a type of ice-marginal landforms with creep-slip characteristics formed by gravity and freeze-thaw based on ice and rock mixtures, and they have a large distribution in the Qinghai-Tibet Plateau and Tianshan Mountains in China. Monitoring studies in recent years have found that a significant acceleration process of creep slip on the surface of rock glaciers has occurred under the influence of climate warming, and the risk of forming mudflows or landslides has increased. The Qinghai-Tibet Plateau is a sensitive area of global warming, and the geological disasters caused by climate warming have received wide attention. In view of this, this paper analyzes and discusses the development characteristics and potential disaster mechanisms of rock glaciers on both sides of the Sangri-Jiacha Gorge in the middle reaches of the Yarlung Zangbo River using field measurements, remote sensing interpretation and theoretical analysis. The results show that the formation and development of rock glaciers are related to the topography, climate and solar radiation of the nurturing environment, and that they are prone to form mudflows or landslides threatening the downstream under the effect of rising temperature, short-duration heavy rainfall or strong earthquakes, mainly manifested by the instability of the constituent materials of the downstream section of rock glaciers.

       

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