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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第45卷

期数:

2023年第03期

页码:

734-748

栏目:

水资源与水文地质

出版日期:

2023-05-15

文章信息/Info

Title:

Sedimentological Characteristics and Geomorphic Effect of Megaflood in Yarlung Tsangpo River, China

文章编号:

1672-6561(2023)03-0734-15

作者:

胡凯衡¹; 杨安娜¹; 2; 吴朝华³; 刘维明¹; 张启源¹; 2

(1. 中国科学院、水利部成都山地灾害与环境研究所,四川 成都 610041; 2. 中国科学院大学,北京 100049; 3. 内江师范学院 建筑工程学院,四川 内江 641100)

Author(s):

HU Kai-heng¹;  YANG An-na¹; 2;  WU Chao-hua³;  LIU Wei-ming¹;  ZHANG Qi-yuan¹; 2

(1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Institute of Architectural Engineering, Neijiang Normal University, Neijiang 641100, Sichuan, China)

关键词:

灾害地貌;  高能洪水;  沉积学;  地貌效应;  巨型边滩;  沉积序列;  雅鲁藏布江;  青藏高原

Keywords:

disaster geomorphology;  megaflood;  sedimentology;  geomorphic effect;  giant bar;  sedimentary sequence;  Yarlung Tsangpo river;  Tibetan Plateau

分类号:

P694

DOI:

10.19814/j.jese.2022.12020

文献标志码:

A

摘要:

青藏高原东南缘雅鲁藏布江流域的气候、水文、构造与地形条件具有发育超大冰川或滑坡堰塞湖及高能洪水的潜力。对高能洪水沉积特征的研究进展进行简要回顾,以青藏高原雅鲁藏布江流域广泛分布的高能洪水地貌和沉积证据为主要研究对象,探讨了该流域高能洪水沉积物的主要沉积特征及其形成原因,最后对该流域高能洪水的地貌效应进行了简要分析。结果表明:雅鲁藏布江流域高能洪水形成的巨型边滩以涡流型边滩居多,其次为点状边滩和吊坠型边滩,未见牵引型边滩; 就沉积特征而言,该流域高能洪水巨型边滩的内部沉积以水平叠层为主,波纹及交错层理层、粉砂层、斜坡沉积和粗砾平行层理层亦见分布; 高能洪水等极端地表过程在青藏高原及雅鲁藏布江的泥沙输移及地貌演变中发挥着关键作用。

Abstract:

The climatic, hydrological, tectonic and topographic conditions of the Yarlung Tsangpo river basin in the southeastern margin of the Tibetan Plateau have the potential to develop super-large reservoir glaciers or landslide-dammed lakes that result in megafloods. The research progresses in the sedimentary characteristics of megafloods were briefly reviewed; by presenting widely distributed geomorphology and sedimentary evidence of megafloods in the Yarlung Tsangpo river basin, the main sedimentary characteristics and causes of megaflood sediments in the basin as well as their geomorphological response in the basin were summarized. The results show that eddy bars are the most common ones in the Yarlung Tsangpo river basin, followed by point bars and pendant bars, but expansion bars are absent; in terms of sedimentary characteristics, the well-sorted, horizontally laminated silt and coarse sand or granules are predominant in the internal sedimentary structure of giant bars; special sedimentary structures, including typical ripple and cross-lamination, silt bed, clinoforms and coarse parallel bedding can also be found sometimes. The evidence and previous studies show that extreme surface processes such as megafloods play a key role in sediment transport and landscape evolution over the Tibetan Plateau and the Yarlung Tsangpo river basin.

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备注/Memo

备注/Memo:

收稿日期:2022-12-09; 修回日期:2023-03-16
基金项目:第二次青藏高原综合科学考察研究项目(2019QZKK0902); 国家自然科学基金项目(91747207)
作者简介:胡凯衡(1975-),男,江西瑞金人,研究员,博士研究生导师,理学博士,E-mail:khhu@imde.ac.cn。

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更新日期/Last Update: 2023-05-30