| 青藏高原东北部青海玉树泥流滑坡特征和成因分析 |
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| 引用本文： | 郝君明,吴通华,李韧,吴晓东,谢昌卫,朱小凡,李旺平,邹德富,胡国杰,杜二计,刘广岳,乔永平.青藏高原东北部青海玉树泥流滑坡特征和成因分析[J].冰川冻土,2020,42(2):447-456. |
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| 作者姓名： | 郝君明 吴通华 李韧 吴晓东 谢昌卫 朱小凡 李旺平 邹德富 胡国杰 杜二计 刘广岳 乔永平 |
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| 作者单位： | 1.中国科学院 西北生态环境资源研究院 冰冻圈科学国家重点实验室 青藏高原冰冻圈观测研究站, 甘肃 兰州 730000;2.兰州理工大学 土木工程学院, 甘肃 兰州 730050;3.中国科学院大学, 北京 100049 |
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| 基金项目： | 国家自然科学基金项目(41690142) |
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| 摘 要： | 青藏高原变暖变湿， 滑坡灾害频发， 严重影响区域工程建设、 生态环境和人类生产活动。泥流滑坡和热融滑塌、 融冻泥流是季节冻土区和多年冻土区的特殊滑坡类型， 形态上相似， 很难区分。同时， 对青藏高原泥流滑坡灾害关注程度低， 研究较少。以青海省玉树州称多县直美村2017年9月7日泥流滑坡事件为例， 利用实测数据、 多时相遥感影像和无人机数据等多源数据和雷达技术手段进行了调查和分析。研究表明： 滑坡发生在坡积扇， 主滑段平均厚度约5 m， 体积约2.4×104 m3， 滑体的滑动方向和重力作用过程一致， 依据滑坡三级分类系统属于堆积土浅层小型牵引式滑坡， 其形成和发育与当地地质条件、 连续降水和冻融循环作用有关； 然后进一步总结泥流滑坡、 热融滑塌和融冻泥流的特征， 认为玉树滑坡是季节冻土区的泥流滑坡。该研究有助于提高人们对泥流滑坡和青藏高原斜坡灾害的科学认识。
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| 关 键 词： | 滑坡 泥流 融冻泥流 热融滑塌 玉树 季节冻土 青藏高原 |
| 收稿时间： | 2019-11-15 |
| 修稿时间： | 2020-05-19 |
A case study on earthflow in Yushu， Qinghai Province on the northeastern Tibetan Plateau： landslide features and cause analysis |
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| Junming HAO,Tonghua WU,Ren LI,Xiaodong WU,Changwei XIE,Xiaofan ZHU,Wangping LI,Defu ZOU,Guojie HU,Erji DU,Guangyue LIU,Yongping QIAO.A case study on earthflow in Yushu， Qinghai Province on the northeastern Tibetan Plateau： landslide features and cause analysis[J].Journal of Glaciology and Geocryology,2020,42(2):447-456. |
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| Authors: | Junming HAO Tonghua WU Ren LI Xiaodong WU Changwei XIE Xiaofan ZHU Wangping LI Defu ZOU Guojie HU Erji DU Guangyue LIU Yongping QIAO |
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| Institution: | 1.Qinghai -Tibet Plateau Cryosphere Observation and Research Station，State Key Laboratory of Cryospheric Science，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China;2.School of Civil Engineering，Lanzhou University of Technology，Lanzhou 730050，China;3.University of Chinese Academy of Sciences，Beijing 100049，China |
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| Abstract: | The Tibetan Plateau is getting warmer and wetter. Landslides， such as earthflow， gelifluction （solifluction） and thaw slump occur frequently， seriously affecting engineering construction， ecological environment and human activities. However， there are only few studies on earthflow hazards on the Tibetan Plateau. And， it is difficult to distinguish earthflow， gelifluction （solifluction） and thaw slump due to some similar characteristics. This paper takes Zhimei landslide （Sept.7， 2017） in Yushu， Qinghai Province as an example， and uses multi-source data， such as measured data， multi-temporal remote sensing images and unmanned aerial vehicle data， and radar technology to investigate and analyze the landslide. It is found that the landslide occurs at the accumulation fan of the slope， of which the average thickness was about 5 m， the volume was about 2.4×104 m3， and the sliding direction of the slide body was consistent with the process of gravity. It is concluded that the landslide is a small traction landslide in the shallow layer of accumulated soil. Then the characteristics of earthflow， thaw slump and gelifluction （solifluction） have been summarized based on the recent research， and it is considered that Yushu landslide is an earthflow in seasonally frozen soil region， which relates to local geological conditions， continuous precipitation and freeze-thaw cycle. This study improves scientific understanding of earthflow and disasters on slope relating to Tibetan Plateau. |
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| Keywords: | landslide earthflow gelifluction （solifluction） thaw slump Yushu seasonally frozen soil Tibetan Plateau |
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