Three-Dimensional Deformation and River Blocking Effects of Landslides in the Upper Jinsha River Revealed by SBAS-InSAR
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摘要:
利用SBAS-InSAR技术处理了2014—2022年间Sentinel-1A升降轨SAR数据，重点研究了白格滑坡堵江事件对其下游最近临滑坡群活动性的影响.选择受堵江影响显著的沙东滑坡进行了地形约束下的InSAR三维形变反演，并结合GNSS监测验证模型性能.研究结果显示，白格滑坡堵江后，沿岸滑坡的形变速率普遍增加了3~7倍不等.特别是位于金沙江凹岸的沙东滑坡，单体受影响面积约1.85 km2，最快变形速率增加了堵江前的7倍.三维形变结果表明，相较于地表平行流（Surface-Parallel Flow，SPF）模型，坡向平行流（Aspect Parallel Flow，APF）地形约束模型在沙东滑坡三维形变反演中的表现更优.
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关键词:
- SBAS-InSAR /
- 三维形变 /
- 白格滑坡 /
- 堵江影响 /
- 工程地质学
Abstract:This study employs the SBAS-InSAR technique to process Sentinel-1A ascending and descending orbit SAR data from 2014 to 2022, focusing on the impact of the Baige landslide-induced river damming event on the activity of the nearest downstream landslide cluster. The Shadong landslide, which was significantly affected by the damming, was selected for terrain-constrained three-dimensional (3D) deformation inversion using InSAR, with GNSS observations used to validate model performance. Results indicate that, following the damming event, deformation rates of the riverside landslides generally increased by a factor of 3 to 7. In particular, the Shadong landslide, located on the concave bank of the Jinsha River, exhibited a notably impacted area of approximately 1.85 km2, with the maximum deformation rate increasing up to 7 times compared to the pre-damming period. The 3D deformation analysis demonstrates that the Aspect-Parallel Flow (APF) terrain-constrained model outperforms the Surface-Parallel Flow (SPF) model in reconstructing the deformation pattern of the Shadong landslide.
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图 2 SBAS-InSAR监测结果
图a和图b为2014年10月至2018年10月的升、降轨监测结果；图c和图d为2018年01月至2021年05月的升、降轨监测结果
Fig. 2. Monitoring results of SBAS-InSAR
图 3 堵江堰塞湖第1次泄洪流量（a）；第2次泄洪流量（b）
Fig. 3. The outburst-flood discharge flow of the dammed lake for the first time (a) and sencond time (b)
图 7 2018年6月~2022年5月SPF和APF约束下的三维形变速率
Fig. 7. Three-dimensional deformation rates under SPF and APF constraints
图 8 水平方向累积形变结果
a.E-W向累积形变；b. N-S向累积形变
Fig. 8. The cumulative deformation in horizontal direction
表 1 Sentinel-1A SAR影像参数
Table 1. The parameters of Sentinel-1A SAR imagery
轨道方向 升轨 降轨 雷达入射角(°) 36.8 42.3 卫星飞行方位角(°) -12.5 192.5 数据量(景) 82/100/110 76/99/118 时段Ⅰ 2014-10-12~2018-10-27 2014-10-07~2018-09-28 时段Ⅱ 2018-01-12~2021-05-20 2018-01-07~2021-05-27 时段Ⅲ 2018-06-05~2022-05-03 2018-06-12~2022-05-22 
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表 2 水平方向年均形变速率对比
Table 2. Comparsion of the annual average deformation rates in horizontal direction
SPF APF GNSS SPF误差 APF误差 东西向（mm/a) 75.31 74.72 82.07 6.73 7.35 南北向（mm/a) 198.21 124.43 137.00 81.21 9.57 水平面夹角(°) 20.80 28.74 30.92 11.88 0.53
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