摘要
冰川运动一定程度上会引发泥石流、滑坡等地质灾害,因此掌握冰川运动过程至关重要。冰川流速揭示冰川运动过程,而已有冰川流速构建方法未考虑冰川流动方向,揭示的冰川运动机制不够精准。选取中天山南依内里切克冰川为对象,基于2018—2020年Sentinel-1A升轨数据,利用像素偏移追踪(Pixel Offset Tracking,POT)技术获得南依内里切克冰川方位向与距离向位移场,引入冰川流动方向构建冰川主流线轴部二维流速,分析冰川运动机制。结果表明:稳定区像元偏移速度远小于冰川主流线轴部二维流速,利用POT技术构建的轴部二维流速模型监测冰川运动过程良好。2018、2019和2020年中天山南依内里切克冰川轴部二维平均流速分别为62.28 cm/d、49.41 cm/d、61.89 cm/d,消融区(冰舌)轴部二维流速随高程的降低呈先缓慢减小后逐渐增大再迅速减小趋势,冰川流速由轴部向两侧边缘递减。随着气温升高,冰川运动速度逐渐增大,气温升高可能是中天山南依内里切克冰川流速加快的主要原因。
Glacier movement can cause debris flow,landslide and other geological disasters to a certain extent,so it is very important to master process of glacier movement.Glacier velocity reveals the process of glacier movement,but some existing methods of constructing glacier velocity do not consider direction of glacier flow,and mechanism of glacier movement revealed is not precise enough.Based on Sentinel-1A ascending orbit data from 2018 to 2020,this paper uses Pixel Offset Tracking(POT)technology to obtain azimuth and range displacement fields of the South Inylchek Glacier in Central Tianshan Mountains,introduces the glacier flow direction to construct the axial two-dimensional velocity of glacial mainstream line,and analyzes the mechanism of glacier movement.The results show that pixel migration velocity in stable region is far less than the axial twodimensional velocity of glacier mainstream line.The axial two-dimensional velocity model constructed by POT technology is good for monitoring the glacier movement process.In 2018,2019 and 2020,the axial two-dimensional average velocities of the South Inylchek Glacier in Central Tianshan Mountains are 62.28 cm/d,49.41cm/d and 61.89 cm/d,respectively.The axial two-dimensional velocity of ablation area(ice tongue)decreases slowly at first,then increases gradually,and last decreases rapidly with the decrease of elevation,and the glacier velocity decreases from axis to edge of both sides.With the increase of temperature,the speed of glacier movement increases gradually.The increase of temperature may be the main reason for the acceleration of glacier velocity.
作者
张亚丽
张立峰
何毅
杨旺
曹胜鹏
Zhang Yali;Zhang Lifeng;He Yi;Yang Wang;Cao Shengpeng(Faculty of Geomatics,Lanzhou Jiaotong University,Lanzhou 730000,China;National⁃Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring,Lanzhou 730000,China;Gansu Provincial Engineering Laboratory for National Geographic State Monitoring,Lanzhou 730000,China)
出处
《遥感技术与应用》
CSCD
北大核心
2022年第6期1319-1327,共9页
Remote Sensing Technology and Application
基金
中国博士后科学基金面上基金项目(2019M660092XB)
甘肃省科技计划项目(20JR2RA002)
甘肃省教育厅项目(2019A-043)
甘肃省自然科学基金项目(20JR10RA249)
甘肃省青年科学基金项目(20JR10RA272)
兰州交通大学-天津大学创新项目基金项目(2020055)
兰州交通大学优秀平台(201806)。
作者简介
张亚丽(1998-),女,甘肃天水人,硕士研究生,主要从事冰川变化研究,E-mail:493497605@qq.com;通讯作者:张立峰(1982-),男,吉林农安人,博士,副教授,主要从事遥感应用研究,E-mail:119273207@qq.com。