[1]马俊学,陈 剑*,崔之久.岷江上游叠溪溃坝堆积体的沉积特征与历史溃决洪峰流量[J].山地学报,2018,(01):63-73.[doi:10.16089/j.cnki.1008-2786.000301]
 MA Junxue,CHEN Jian*,CUI Zhijiu.Sedimentary Characteristics of the Stacked Body of the Broken Diexi Dam in the Upper Reaches of the Minjiang River, China and Its Historical Peak Flow[J].Mountain Research,2018,(01):63-73.[doi:10.16089/j.cnki.1008-2786.000301]
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岷江上游叠溪溃坝堆积体的沉积特征与历史溃决洪峰流量()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2018年01期
页码:
63-73
栏目:
山地灾害
出版日期:
2018-01-30

文章信息/Info

Title:
Sedimentary Characteristics of the Stacked Body of the Broken Diexi Dam in the Upper Reaches of the Minjiang River, China and Its Historical Peak Flow
文章编号:
1008-2786-(2018)1-053-11
作者:
马俊学1陈 剑1*崔之久2
1.中国地质大学(北京)工程技术学院,北京 100083; 2.北京大学 城市与环境学院,北京 100871
Author(s):
MA Junxue1 CHEN Jian1* CUI Zhijiu2
1.School of Engineering and Technology, China University of Geosciences(Beijing), Beijing 100083, China; 2.College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
关键词:
叠溪古堰塞湖 溃坝堆积体 沉积特征 溃决洪水 洪峰流量 岷江上游
Keywords:
Diexi paleo-dammed lake outburst deposits sedimentary characteristics outburst flood peek discharge upper Minjiang River
分类号:
P642
DOI:
10.16089/j.cnki.1008-2786.000301
文献标志码:
A
摘要:
岷江上游叠溪河谷段在地质历史时期发生了一次大型岩质古地震山体滑坡事件,并堵塞岷江形成一个大型古堰塞湖。堰塞湖形成后在晚更新世晚期(约27 ka BP)发生了溃决,并在其下游形成长约5 km的天然溃坝堆积体。基于野外地质调查,采用测量统计、取样分析及理论计算等方法,研究了叠溪古堰塞湖溃坝堆积体的沉积特征,并重建了溃决洪水的最大洪峰流量。叠溪溃坝堆积体主要由砾石、卵石、砂及少量粉/黏土组成,剖面中发育叠瓦、孔洞、块状、杂基、支撑-叠置及韵律互层等构造特征。从上游至下游,溃坝堆积体的出露厚度逐渐变薄,砾石碎屑成分表现出由粗变细的变化趋势。采用水力学理论方法重建了溃决洪水的最大洪峰流量,溃口处洪水平均流速和最大洪峰流量分别为17.23 m/s和49821.28 m3/s,如此大规模的堰塞湖溃决洪水在世界范围内也是十分罕见的。叠溪溃坝堆积体的沉积特征与溃决洪峰流量重建,对于了解滑坡堰塞湖坝体溃决过程、溃决洪水演进机制以及山区地质环境演化规律等方面具有重要意义。
Abstract:
During the geological history, a large-scale shock-induced rock landslide occurred at Diexi in the upper reaches of the Minjiang River and blocked the Minjiang River to form a large dammed lake.After the formation of the dammed lake, later it broke in the Late Pleistocene(about 27 ka BP)and formed a natural dam-break mass downstream about 5 km long.Based on the field geological survey, the sedimentary characteristics of the Diexi dam were studied by means of measurement statistics, sampling analysis and theoretical calculation, and the maximum outburst flood discharge was reconstructed.The gravel, pebble, sand and a small amount of powder / clay were the main components of Diexi dam-break deposit.Structural features such as imbrication, caviation, bolder structures, miscellaneous groups, supporting-stacking and rhythmic interbed were developed in the profile.From the upstream to the downstream, the exposed thickness of the dam body gradually becomes thinner, and the composition of the gravel debris changed from coarse to fine.The maximal peak flow of the outburst flood was reconstructed by using the theory of hydraulics.The average flood peak velocity at the breach and the maximum peak flow were estimated as 17.23 m/s and 49821.28 m3/s, respectively.Therefore, it is rare case worldwide.The sedimentary characteristics and the reconstruction of outburst flood discharge in Diexi dam are of great significance in understanding the process of failure of landslide dam, the evolution mechanism of flush flood and the evolution of the geological environment in mountainous areas.

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备注/Memo

备注/Memo:
收稿日期(Received date):2017-05-04; 改回日期(Accepted date):2018-2-8
基金项目(Foundation item):国家自然科学基金面上项目(41571012); 国家自然科学基金重点项目(41230743); 中央高校基本科研业务费专项资金资助项目(2652015060)。[National Natural Science Foundation of China-General Program(41571012); National Natural Science Foundation of China-Key Program(41230743); Fundamental Research Funds for the Central Universities(2652015060)]
作者简介(Biography):马俊学(1987-),男,山东德州人,博士研究生,助理工程师,主要研究方向:工程地质与地质灾害防治。[Ma Junxue(1987-), male, born in Dezhou, Shandong province, Ph.D.candidate, research on engineering geology and geoharzard prevention] E-mail:sdnj2mjx@163.com
*通讯作者(Corresponding author):陈剑(1975-),男,博士,副教授,主要研究方向:灾害地貌学、工程地质和地质灾害防治。[Chen Jian(1975-), male, Ph.D., associate professor, specialized in disastrous geomorphology, engineering geology and geoharzard prevention] E-mail:jianchen@cugb.edu.cn
更新日期/Last Update: 2018-01-30