2004-2022年绒布冰川遥感监测及变化分析  

Remote Sensing Monitoring in Rongbuk Glacier From 2004 to 2022 and Its Change Analysis

作　　者：邓忠军 袁龙 李建军 王江妹 和冬娟 曹雅迪 晋良高 DENG Zhong-jun;YUAN Long;LI Jian-jun;WANG Jiang-mei;HE Dong-juan;CAO Ya-di;JIN Liang-gao(Surveying and Mapping Institute of Xizang Autonomous Region,Lhasa Xizang 850000,China;Sichuan Surveying and Mapping Technology Service Center Co.,Ltd,Chengdu Sichuan 610036,China;Geothermal Geology Brigade of Geology and Mineral Exploration and Development Bureau of Xizang Autonomous Region,Lhasa Xizang 850000,China)

机构地区：[1]西藏自治区测绘院,西藏拉萨850000 [2]四川省测绘技术服务中心有限责任公司,四川成都610036 [3]西藏自治区地质矿产勘查开发局地热地质大队,西藏拉萨850000

出　　处：《地矿测绘》2024年第1期1-7,36,共8页Surveying and Mapping of Geology and Mineral Resources

基　　金：四川省科技厅重点研发项目“西藏绒布冰川演化规律研究及对周围生态环境、地质灾害影响研究”(2022YFQ0049)。

摘　　要：针对绒布冰川地区研究冰川演变、运动监测的相关研究较少的问题,聚焦于近20年,采用Landsat系列影像、数字高程模型等数据,提取了2004—2022年的绒布冰川分布信息,研究近年来该流域冰川面积的分布及不同地形下冰川的变化情况。结果表明:1)2004—2022年绒布冰川流域面积减少了5.76%,其中2010年后冰川面积变化剧烈,先呈大幅下降的趋势,后又迅速上升,在2018—2022年增加了10.81 km^(2)。2)空间上,近20年绒布冰川地区的冰川分布整体破碎化程度加剧、冰川出现南移趋势;中部的冰川有一定程度的衰减,南部破碎化程度有所改善。3)研究区北面坡的冰川较为稳定,南面坡衰减与恢复变化明显;冰川主要分布在坡度为5°~25°的地区,坡度大于5°的冰川随着坡度的增加分布逐渐减少。In response to the lack of research on glacier evolution and motion monitoring in the Rongbuk Glacier region,focused on the past 20 years,using Landsat series images,digital elevation model(DEM),and other data,the information on Rongbuk Glacier from 2004 to 2022 was extracted.The distribution of glacier area and changes in ice streams under different landforms in the watershed in recent years were studied.The results showed that:1)From 2004 to 2022,the watershed area of Rongbuk Glacier decreased by 5.76%.After 2010,the glacier area changed dramatically,showing a significant downward trend,and then increased rapidly,increasing by 10.81 km^(2) within four years.2)From the perspective of spatial distribution,the overall fragmentation of the glacier distribution in the Rongbuk Glacier had intensified in the past 20 years,with the glacier showing a southward trend.The glaciers in the middle had a certain degree of attenuation,while the fragmentation degree in the south had improved.3)The glacier on the north slope in the study area was relatively stable,while the glacier on the south slope had significant changes in attenuation and recovery.The glaciers in the study area was mainly distributed in areas with slopes of 5°to 25°,and the distribution of glaciers with slopes greater than 5°gradually decreased with the increase of slopes.

关 键 词：绒布冰川 冰川变化 遥感 冰川面积 比值阈值法 

分 类 号：P237.9[天文地球—摄影测量与遥感]