| 基于Sentinel-1数据对青藏高原五道梁多年冻土区地面形变的监测与分析 |
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| 引用本文： | 周华云,赵林,田黎明,吴振明,谢梅珍,原黎明,倪杰,乔永平,高泽深,史健宗.基于Sentinel-1数据对青藏高原五道梁多年冻土区地面形变的监测与分析[J].冰川冻土,2019,41(3):525-536. |
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| 作者姓名： | 周华云 赵林 田黎明 吴振明 谢梅珍 原黎明 倪杰 乔永平 高泽深 史健宗 |
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| 作者单位： | 1.兰州交通大学 测绘与地理信息学院，甘肃 兰州 730070；
2.中国科学院 西北生态环境资源研究院 青藏高原冰冻圈观测研究站，甘肃 兰州 730000；
3.甘肃省地理国情监测工程实验室，甘肃 兰州 730070；
4.中国科学院大学，北京 100049 |
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| 基金项目： | 国家自然科学基金项目（41421061）资助 |
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| 摘 要： | 在气候变暖背景下，地面形变监测可以反映多年冻土的发育趋势。利用欧空局Sentinel-1降轨数据（2014年11月27日至2017年3月4日），基于SBAS-InSAR技术，获取了五道梁多年冻土区的地面形变状况，并分析了环境因子对其的影响。结果表明，近年来该地区地面主要表现为沉降趋势，与水准实测形变趋势吻合，相对误差为22.4%，均方根误差为4.3 mm；形变变化速率为-10.28 mm·a-1，相对误差为14.79%。植被类型、地形地貌对多年冻土区地面形变影响较大。植被发育越好，由于土壤含水量越高，地面形变量越大；而植被覆盖度在一定程度上会影响Sentinel-1数据获取地面形变信息的精度；地形起伏较大的山区形变量存在垂直向与南北向的差异；水体分布较多的地区，信号失相干相对严重，Sentinel-1数据获取地面形变信息的能力会受到较大的影响。此外，降水事件与日冻融循环作用对Sentinel-1数据获取地面形变信息的精度影响也不可忽略。因此，在利用Sentinl-1数据获取青藏高原多年冻土区地面形变信息时，要综合考虑下垫面、气候条件与冻土日冻融循环的影响。
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| 关 键 词： | Sentinel-1 五道梁 SBAS-InSAR 多年冻土 地面形变 青藏高原 |
| 收稿时间： | 2017-11-11 |
| 修稿时间： | 2018-06-12 |
Estimation and analysis of
surface deformation in the permafrost area of Wudaoliang based on Sentinel-1
data |
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| ZHOU Huayun,ZHAO Lin,TIAN Liming,WU Zhenming,XIE Meizhen,YUANLiming,NI Jie,QIAO Yongping,GAO Zesheng,SHI Jianzong.Estimation and analysis of
surface deformation in the permafrost area of Wudaoliang based on Sentinel-1
data[J].Journal of Glaciology and Geocryology,2019,41(3):525-536. |
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| Authors: | ZHOU Huayun ZHAO Lin TIAN Liming WU Zhenming XIE Meizhen YUANLiming NI Jie QIAO Yongping GAO Zesheng SHI Jianzong |
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| Institution: | 1.Faculty
of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China;
2.Cryosphere Research Station on the
Qinghai-Tibet Plateau, Northwest Institute of Eco-Environment and Resources,
Chinese Academy of Sciences, Lanzhou 730000, China;
3.Geographical Condition Monitoring
Engineering Laboratory of Gansu Province, Lanzhou 730070, China;
4.University of Chinese Academy of Sciences,
Beijing 100049, China |
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| Abstract: | Frequent freeze-thaw cycles of the active layer can cause surface
deformation, and thus monitoring surface deformation, to a certain extent, can
reflect permafrost development in the context of climate warming. In this
study, the time-series of surface deformation in Wudaoliang region from 2014 to
2017 has been obtained and analyzed its relations with environmental factors by
using the Sentinel-1 data, SBAS-InSAR technology, and in-situ observations. The results
indicated that the surface deformation of this region showed a subsidence
trend, in accordance with the in-situ observations, with the relative
error and RMSE of 22.4% and 4.3 mm, respectively. The annual change rate of
deformation and relative error was -10.28 mm and 14.79%, respectively.
Vegetation types and landform had great impacts on surface deformation in permafrost
area, as well as the capacity of InSAR technology to obtain deformation. Due to
high soil moisture content in vegetation-developed regions, the changing
magnitude of surface deformation is large. The surface deformation showed high
heterogeneity because of large differences in altitudes and aspects of mountain
areas. The signal lost seriously in areas with water, combined with the effects
of precipitation and daily freeze-thaw cycles in permafrost region, thus
affecting the ability of InSAR technology to obtain ground deformation.
Therefore, it is necessary to take the underlying conditions and freeze-thaw
cycles into consideration when estimating surface deformation in permafrost
regions by using InSAR techniques. |
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| Keywords: | Sentinel-1 SBAS-InSAR Wudaoliang permafrost deformation Tibetan Plateau |
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