[1]刘 青,王 伟*,高 星,等.大型滑坡坝溃决对下游河谷坡岸的影响分析——以白格滑坡下游50 km内的河谷边坡为例[J].山地学报,2021,(2):226-237.[doi:10.16089/j.cnki.1008-2786.000590]
 LIU Qing,WANG Wei*,GAO Xing,et al.Analysis of the Effects of Dammed Lake Outburst Floods on Geomorphology of River Basin: A Case Study of the Valley Slope Erosion within 50 km Downstream of the Baige Landslide, Tibet, China[J].Mountain Research,2021,(2):226-237.[doi:10.16089/j.cnki.1008-2786.000590]
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大型滑坡坝溃决对下游河谷坡岸的影响分析——以白格滑坡下游50 km内的河谷边坡为例()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2021年第2期
页码:
226-237
栏目:
山地灾害
出版日期:
2021-03-25

文章信息/Info

Title:
Analysis of the Effects of Dammed Lake Outburst Floods on Geomorphology of River Basin: A Case Study of the Valley Slope Erosion within 50 km Downstream of the Baige Landslide, Tibet, China
文章编号:
1008-2786-(2021)2-226-12
作者:
刘 青12王 伟12*高 星12兰恒星12
1. 中国科学院地理科学与资源研究所 资源与环境信息系统国家重点实验室,北京100101; 2. 中国科学院大学,北京100049
Author(s):
LIU Qing12 WANG Wei12* GAO Xing12 LAN Hengxing12
1. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
关键词:
堰塞湖泄流 河谷边坡 相关性分析 金沙江 白格滑坡
Keywords:
Dammed lake outburst flood valley slope correlation analysis Jinsha River Baige landslide
分类号:
P237; P642.22
DOI:
10.16089/j.cnki.1008-2786.000590
文献标志码:
C
摘要:
堰塞湖的泄流会对下游河谷边坡造成严重的冲刷,对下游居民的生产生活及基础设施的安全造成威胁。为了研究堰塞湖泄流对下游河谷边坡的影响,选取了具有足够代表性的金沙江白格滑坡下游一定范围(50 km)的河谷边坡为代表区域,将遥感信息提取技术、GIS技术与空间分析等方法相结合,定量地研究了堰塞湖泄流对河谷边坡的影响; 并综合考虑了河流形态发育中的重要影响因素,从地形、地貌和地质三个方面分析了不同影响因素对冲刷效果的影响。结果表明:(1)冲刷面积在河流弯曲度较大的地方普遍较大;(2)坡度与冲刷面积呈幂律分布,且在坡度35°~40°范围内冲刷作用最强;(3)地质岩性对冲刷面积的影响作用显著,受风化作用影响,花岗岩分布的区域相较于大理岩冲刷面积普遍较大;(4)在当前研究的尺度和精度下,地貌要素与冲刷面积具有一定的相关关系。本研究成果可对该区域滑坡灾害的预防以及大型工程选址建设提供参考。
Abstract:
Dammed lake outburst floods cause serious erosion to riverbanks downstream, posing great threats to the safety of local communities and infrastructure in the lower reaches. In order to evaluate the effects of dammed lake outburst floods on geomorphology of river basin, a representative segment of river valley in the upper reaches of the Jingsha River was targeted in this study within a range of 50 km downstream of Baige landslide, Jiangda county, Tibetan Autonomous Region, China, which occurred on October and November of 2018 with serious economic losses. It quantitatively examined the scouring actions to basin shapes incurred by lake water gushing from the breached dam based on extraction technology of remote sensing information, GIS technology and spatial analysis method. The influence of different geo-environmental factors on the scouring effects for Baige landslide was comprehensively analyzed from the three aspects of topography, geomorphology and geology, as well as it considering the evolving history of fluvial landform. The results show that:(1)Fluvial erosion quite occurred at places with large curved reaches.(2)The distribution of slope areas and fluvial areas obeyed power-law distribution, and in a slope range of 35°~40° the scouring action of a flash flood was the strongest.(3)Geological lithology had a significant impact on scouring area. Due to weathering effect, scouring took placed at places with granite riverbed in river channel generally larger than that with marble riverbed.(4)Limited to the scale and accuracy of current research, only geomorphic elements appeared to have a certain correlation with fluvial area as results of dammed lake outburst floods, which is worthy of further study. The results of this study provide reference for the prevention of landslide disasters and the site selection and construction of large-scale projects in this area.

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备注/Memo

备注/Memo:
收稿日期(Received date):2020-03-26; 改回日期(Accepted date): 2021-03-25
基金项目(Foundation item):国家重点研发计划项目(2018YFE0100100); 国家自然科学基金(41790443,41641040)[National Key Research and Development Program of China(2018YFE0100100); National Natural Science Foundation of China(41790443, 41641040)]
作者简介(Biography):刘青(1996-),女,河南南阳人,硕士研究生,主要研究方向:山地灾害。[LIU Qing(1996-), female, born in Nanyang, Henan province, M.Sc. candidate, research on mountain disaster] E-mail: liuqing@lreis.ac.cn
*通讯作者(Corresponding author):王伟(1972-),男,河北涿州人,副研究员,主要研究方向:地质灾害与信息技术。[WANG Wei(1972-), male, born in Zhuozhou, Hebei province, Ph.D., associate professor, research on geological disasters and information technology] E-mail: wang_wei@lreis.ac.cn
更新日期/Last Update: 2021-03-30