金沙江上游SBAS-InSAR滑坡三维形变监测与堵江影响分析
蒋亚楠 , 许强 , 汤明高 , 朱星 , 张超
地球科学 ›› 2026, Vol. 51 ›› Issue (4) : 1189 -1199.
金沙江上游SBAS-InSAR滑坡三维形变监测与堵江影响分析
Three-Dimensional Deformation and River Blocking Effects of Landslides in the Upper Jinsha River Revealed by SBAS-InSAR
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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.
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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国家自然科学基金项目(42304042)
四川省自然科学基金重点项目(2026NSFSCZY0024)
全国重点实验室开放基金(SKLGED2024-5-2)
部-省合作重点研发项目(2023ZRBSHZ049)
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