New scientific issues in the study of high-elevation and long-runout landslide dynamics in the Qinghai-Tibet Plateau
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摘要:
高位远程滑坡动力学机理的研究一直是国际地质灾害领域的难点问题。在青藏高原, 由于地质条件复杂, 高位远程滑坡表现出更为复杂且强烈的动力作用, 出现超高位超远程的链式成灾模式。文章针对青藏高原高位远程滑坡所表现出的三种突出动力学效应——动力破碎效应、动力侵蚀效应以及流态化效应, 从地质特征调查、物理模型试验、数值分析三个层面进行了系统性的综述。针对青藏高原高位远程滑坡目前的研究现状提出了下一步要解决的三个关键科学问题: 极端地质环境下高位远程滑坡机理研究、基于尺寸效应的模型试验新方法研究和高位远程滑坡流域性灾害链研究。这些问题将为高位远程滑坡动力学机理的研究和服务工程建设中高位远程滑坡灾害的防灾减灾提供科学依据。
Abstract:The dynamic mechanism of high-elevation and long-runout landslides is always a tricky problem in geological disaster research. Due to the complex geological conditions in the Qinghai-Tibet Plateau, high-elevation and long-runout landslides show more complex and robust dynamic action, resulting in disaster chains of ultra-high elevation and ultra-long distance. The article presents a systematic review of the geological characteristics, physical model tests, and numerical analysis of three prominent dynamic effects of high-elevation and long-runout landslides in the Qinghai-Tibet Plateau, namely, dynamic fragmentation, dynamic erosion, and fluidization. Given the current research status of high-elevation and long-runout landslides in the Qinghai-Tibet Plateau, three significant aspects are proposed to be studied in the future: the mechanism of high-elevation and long-runout landslides in extreme geological environments, new methods for model tests based considering size effect, and basin-wide hazard chains induced by high-elevation and long-runout landslides.
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图 1 青藏高原高位远程滑坡
a—易贡高位远程滑坡;b—色东普高位远程滑坡;c—则隆弄高位远程滑坡
Figure 1. High-elevation and long-runout landslides in the Qinghai-Tibet Plateau
(a)The Yigong high-elevation and long-runout landslide; (b) The Sedongpu high-elevation and long-runout landslide; (c) The Zelongnong high-elevation and long-runout landslide
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