2014—2020年科其喀尔巴西冰川运动速度年际与季节变化特征分析  被引量:1

Interannual and seasonal variation of flow velocity in Koxkar Baxi Glacier from 2014 to 2020

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作  者:赵晋彪 张震[1,2,3,4] 许杨杨 王荣军 蒋宗立 ZHAO Jinbiao;ZHANG Zhen;XU Yangyang;WANG Rongjun;JIANG Zongli(School of Spatial Information and Mapping Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui,China;Key Laboratory of Aviation-aerospace-ground Cooperative Monitoring and Early Warning of Coal Mining-induced Disasters of Anhui Higher Education Institutes,Anhui University of Science and Technology,Huainan 232001,Anhui,China;Coal Industry Engineering Research Center of Mining Area Environmental And Disaster Cooperative Monitoring,Anhui University of Science and Technology,Huainan 232001,Anhui,China;State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;School of Earth Sciences and Spatial Information Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China)

机构地区:[1]安徽理工大学空间信息与测绘工程学院,安徽淮南232001 [2]安徽理工大学矿山采动灾害空天地协同监测与预警安徽普通高校重点实验室,安徽淮南232001 [3]安徽理工大学矿区环境与灾害协同监测煤炭行业工程研究中心,安徽淮南232001 [4]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,甘肃兰州730000 [5]湖南科技大学地球科学与空间信息工程学院,湖南湘潭411201

出  处:《冰川冻土》2022年第6期1730-1739,共10页Journal of Glaciology and Geocryology

基  金:国家自然科学基金项目(42071085;41701087;42001068);冰冻圈科学国家重点实验室开放基金项目(SKLCS 2020-10)资助。

摘  要:冰川运动是认识冰川性质的关键因素,也是冰川动力学的主要研究内容之一,能够为冰川资源合理利用及冰川灾害预警提供基础支撑。利用2014—2020年Landsat 8遥感影像,采用影像互相关方法,提取科其喀尔巴西冰川表面运动速度,并分析冰川表面运动速度的时空变化特征及影响因素。研究结果表明:(1)科其喀尔巴西冰川年均运动速度为0.04~0.05 m·d-1;(2)冰川运动速度由中流线向边缘逐渐减小,在消融区随着海拔的升高而加快,在积累区随着海拔的升高而降低,物质平衡线附近运动最快(0.17~0.20 m·d-1),与冰川运动的一般规律一致;(3)冰川运动速度具有“暖季快,冷季慢”的季节变化特征,暖季比冷季快16.67%;(4)2014—2020年冰川运动速度呈微弱减小趋势,平均运动速度减少约0.01 m·d-1;(5)气温、降水对冰川的运动速度季节波动及年际变化都具有一定的影响。Glacier flow is a key factor in understanding the nature of glaciers, and it is also one of the main research contents of glacier dynamics, which can provide basic support for rational utilization of glacier resources and early warning of glacier disasters. There are many mountain glaciers located in the west of China. The study on the spatiotemporal variation of surface velocity of glaciers also has great significance for the social and economic development of the western China. Koxkar Baxi Glacier, locates on the southern slopes of the Tomur Peak, is a typical dendritic glacier. In order to obtain the conditions of Koxkar Baxi Glacier’ flow rates and its variation to further reveal the future of the variation of glacier, the spatiotemporal variability of glacier velocity was surveyed using correlation(COSI-Corr) method on Landsat imagery from 2014 to 2020. The results show that:(1) The average annual flow velocity of the Koxkar Baxi Glacier was 0.04~0.05 m·d-1 during 2014 to 2020.(2) The glacier reaches its maximum flow velocity near the center part, and the velocity decreased towards both lateral margins. In a longitudinal profile, ice flow velocity in the accumulation area increased down to the equilibrium line, while decreased towards the glacier terminal. The maximum velocity with 0.17~0.20 m·d-1 was found near the equilibrium line altitude.(3) The glacier flow velocity in warm seasons were 16.67% faster than that in cold seasons.(4) The glacier flow velocity from 2014 to 2020 showed a slight decreasing trend, and the average flow velocity decreased 0.01 m·d-1.(5) Temperature and precipitation had certain influence on the seasonal fluctuation and interannual variation of the flow velocity of the glacier.

关 键 词:冰川运动速度 遥感影像 科其喀尔巴西冰川 影像互相关 时空变化 

分 类 号:P343.6[天文地球—水文科学]

 

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