Application of Sentinel-1A and ALOS-2 images in monitoring deformation characteristics of Zhixincun landslide
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摘要: 2017年7月，吉林市遭受罕见暴雨天气影响，致使治新村发生了滑坡地质灾害，实地考察发现该滑坡现处于蠕变阶段，对附近居民区造成严重威胁。为实现对该滑坡的有效监测，为灾害预防提供参考，本文选取2017年27景sentinel-1A数据，基于小基线雷达干涉测量技术（SBAS-InSAR）对治新村滑坡进行了形变监测，并分析了其时序演化态势；选用2016、2017年2景更具穿透性的ALOS-2数据，采用差分雷达干涉测量技术（D-InSAR）监测了该滑坡形变体的特征。SBAS-InSAR监测结果表明，治新村滑坡汇水区斜坡末端在监测期间发生了沉降，并且在7月5日到7月29日期间滑坡末端地表沉降达12.47 mm，监测期间平均沉降速率为2.88 mm/a。位于山谷的受威胁居民区发生了抬升，至12月8日平均累计抬升达19.59 mm，监测期间平均抬升速率19.99 mm/a；D-InSAR结果显示，治新村滑坡汇水区斜坡存在5处主要变形体，面积最大变形体面积17973 m2，位于西侧斜坡；最不稳定变形体位于斜坡东侧，监测期间平均累积形变量最大达49.9 mm，滑坡灾害威胁主要来自植被覆盖较差的西侧斜坡，雨季是治新村滑坡灾害防治的重点时期。
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关键词:
- 滑坡 /
- 治新村 /
- SBAS-InSAR /
- D-InSAR /
- ALOS-2 /
- sentinel-1A
Abstract: In July 2017, Jilin City was affected by unusually heavy rain, which caused a landslide geological disaster in Zhixin Village. Field investigation found that the landslide was now in the creep stage, posing a serious threat to nearby residential areas. In order to realize effective monitoring of the landslide and provide reference for disaster prevention, this paper selected 27 sentinel-1A data in 2017 to monitor the deformation of Zhixincun landslide based on small baseline radar interferometry technology (SBAS-InSAR), and analyzed its temporal evolution situation. Using the more penetrating ALOS-2 data from 2016 and 2017, the characteristics of the landslide variant were monitored by differential radar interferometry (D-InSAR). The SBAS-InSAR monitoring results showed that the slope end of the landslide catchment area in Zhixincun had subsidence during the monitoring period, and the surface subsidence at the landslide end reached 12.47 mm from July 5 to July 29, with an average subsidence rate of 2.88 mm/a during the monitoring period. Uplift occurred in the threatened residential areas located in the valley, with an average cumulative uplift of 19.59 mm as of December 8 and an average rate of 19.99 mm/a during the monitoring period. The D-InSAR results showed that there were five major deformities on the slope of the landslide catchment area in Zhixincun, and the largest deformities were 17973 m2, located on the west slope. The most unstable deformation was located on the east side of the slope, and the average cumulative shape variable reached 49.9 mm during the monitoring period. The threat of landslide disaster mainly came from the west slope with poor vegetation coverage. The rainy season is the key period for the prevention and control of landslide disaster in Zhixincun.-
Key words:
- landslide /
- Zhixin village /
- SBAS-InSAR /
- D-InSAR /
- ALOS-2 /
- sentinel-1A
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图 3 时空基线图（左）与像对连接图（右）
Figure 3. SBAS-InSAR Processing Process （left） and D-InSAR Processing Process （right）
图 4 D-InSAR形变测量精度（左）、高程测量精度（右）
Figure 4. D-InSAR Displacement Precision (left) and Height Precision (right)
图 6 SBAS-InSAR监测点时序特征
Figure 6. Temporal Characteristics of SBAS-InSAR Monitoring Points
表 1 Sentinel-1A数据集
Table 1. Sentinel-1A data set
序号 成像时间 时间基线/day 空间基线/m 01 20170106 60 43.8 02 20170118 48 19.9 03 20170130 36 75.9 04 20170211 24 170.1 05 20170223 12 109.8 06 20170307 0 0 07 20170319 12 −15.5 08 20170331 24 32.9 09 20170412 36 57.4 10 20170424 48 128.3 11 20170506 60 92.7 12 20170518 72 47.9 13 20170530 84 −70.3 14 20170611 96 104.5 15 20170623 108 95.2 16 20170705 120 25.1 17 20170729 144 43.2 18 20170810 156 71.3 19 20170822 168 27.8 20 20170903 180 62.6 21 20170915 192 107.1 22 20170927 204 62.3 23 20171009 216 70.1 24 20171021 228 122.2 25 20171102 240 145.3 26 20171126 264 56.1 27 20171208 276 61.5 
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表 2 ALOS-2影像信息
Table 2. Alos-2 Image Information
序号 成像时间 时间基线/day 空间基线/m 01 20160726 392 −225.5 02 20170822
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表 3 斜坡变形体
Table 3. Deformation of Slope
编号 面积/m² 最大沉降量/mm 最小沉降量/mm 平均沉降量/mm 01 5318 58.6 29.4 43.2 02 17973 50.6 24.2 36.4 03 4636 68.7 29.8 43.5 04 3043 71.8 31.3 49.9 05 11281 47.6 20.1 38.3
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