[1]邓 丽,常 宏*,沈俊杰.塔什库尔干谷地古滑坡堰塞湖事件重建及其地貌响应[J].山地学报,2023,(1):82-92.[doi:10.16089/j.cnki.1008-2786.000732]
 DENG Li,CHANG Hong*,SHEN Junjie.A Paleolandslide-Dammed Lake and Its Impact on Geomorphology in Taxkorgan Valley, Xinjiang, China[J].Mountain Research,2023,(1):82-92.[doi:10.16089/j.cnki.1008-2786.000732]





A Paleolandslide-Dammed Lake and Its Impact on Geomorphology in Taxkorgan Valley, Xinjiang, China
邓 丽12常 宏13*沈俊杰12
(1.中国科学院地球环境研究所,西安 710061; 2.中国科学院大学,北京 100049; 3.中国科学院第四纪科学与全球变化卓越中心,西安 710061 )
DENG Li12 CHANG Hong13* SHEN Junjie12
(1. Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. CAS Center for Excellence in Quaternary Science and Global Change, Xi'an 710061, China)
帕米尔高原 古滑坡 塔什库尔干谷地 堰塞湖 河流陡峭指数
the Pamirs paleolandslide the Taxkorgan valley dammed lake the steepness index(Ksn)
塔什库尔干谷地构造活动频繁,滑坡、泥石流等自然灾害频发,滑坡体堵塞河流形成堰塞湖,堰塞体溃决后引发特大洪水。开展塔什库尔干谷地古堰塞湖的形成演化研究,可以提高对堰塞湖灾害的认知,预防地质灾害发生和降低灾害损失。目前已有对塔什库尔干曲曼村古堰塞湖湖相沉积形成年代和所记录的古环境信息研究,然而针对该湖泊的形成演化及形成后的地貌响应却鲜有开展。本研究以野外调查为基础,结合室内分析,对曲曼古滑坡堰塞湖的区域地貌和残留湖相沉积物特征进行了详细的分析。研究结果表明:(1)曲曼古滑坡堰塞湖形成可能是由于古地震诱发滑坡导致的,残留滑坡坝的表面积约为4.30×105 m2,其体积约为2.30×107 m3,所形成的堰塞湖最大湖面积约为2.01×107 m2,最大库容量约为1.12×109 m3,溃决时的洪峰流量约为49 507 m3/s;(2)滑坡坝上游陡峭指数大于滑坡坝下游陡峭指数,说明残留滑坡坝仍对现代河道的地貌形态有一定影响,下游方向仍在进行较为强烈的地貌调整。本研究深入研究塔什库尔干古堰塞湖,可以为区域地貌演化及地质灾害发育过程研究提供一定参考。
The Taxkorgan valley is a typical area of frequent tectonic activities and geological hazards. Ancient landslides and debris flows dominated in this valley, quite often followed by sliding geo-bodies blocking rivers in the downstream and formed lots of barrier lakes. Past research concerns were mostly made to the formation age and paleoenvironmental profile of these paleolandslide-dammed lakes, but little to the formation and evolution of the lakes and resulting geomorphic responses to this process. It is imperative to exemplify the formation and evolution of the paleolandslide-dammed lakes by a case study for better control of barrier-lake-break-flood and prevention.In this study, a plot of paleolandslide-dammed lake sediments of the Taxkorgan valley at the Quman village, Xinjiang, China was targeted for investigation of the geomorphology and characteristics of sediments. It was done by field survey, analysis of a digital elevation model(DEM)and remote sensing images.Following results were obtained:(1)This lake was possibly formed by a paleoearthquake-triggered landslide, with a residual dam surface area of around 4.30×105 m2 and a volume of about 2.30×107 m3. Approximately, the lake's maximum surface area was 2.01×107 m2 with water volume 1.12×109 m3, and its maximum flow during an event of barrier-lake-break-flood was approximately 49 507 m3/s.(2)The steepness index(Ksn)for the upstream of the landslide dam was greater than the Ksn for the downstream of the landslide dam, representing a response to a relatively strong geomorphic reshape process. This result was ascribed to the lasting impact of the landslide dam on the Taxkorgan river. Our findings provide references to future studies on regional geomorphic evolution and the emergence of geological hazards in the Taxkorgan valley.


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收稿日期(Received date): 2022-12-13; 改回日期(Accepted date): 2023-02-24
基金项目(Foundation item): 第二次青藏高原综合科学考察项目(2019QZKK0707); 中国科学院战略先导专项(XDB40010100)。[The Second Tibetan Plateau Scientific Expedition Program(2019QZKK0707); The Strategic Priority Research Program of Chinese Academy of Sciences(XDB40010100)]
作者简介(Biography): 邓丽(1998-),女,四川南充人,硕士研究生,主要研究方向:第四纪地质与全球变化。[DENG Li(1998-), female, born in Nanchong, Sichuan province, M. Sc. candidate, research on quaternary geology and global change] E-mail: dengli2020@ieecas.cn
*通讯作者(Corresponding author): 常宏(1970-),男,博士,研究员,主要研究方向:第四纪地质与全球变化。[CHANG Hong(1970-), male, Ph.D., professor, research on quaternary geology and global change] E-mail: changh@loess.llqg.ac.cn

更新日期/Last Update: 2023-01-30