西山村滑坡时序形变的SBAS-InSAR监测

Monitoring time series deformation of Xishancun landslide with SBAS-InSAR

针对传统地表形变监测技术在我国西南山区深厚堆积层滑坡体形变监测中存在的时空分辨率问题,该文利用72景时序Sentinel-1A TOPS SAR影像,基于短基线集(SBAS-InSAR)技术获取2016—2019年四川理县通化乡西山村滑坡的时序形变特征。结果表明:西山村滑坡整体呈近线性沉降的运动趋势,在监测时段内未出现加速现象,处于长期活跃的蠕动形变。其时序形变结果呈现较为均匀的变化,与坡体形态吻合度较高,雷达视线方向的累计形变量在-315.2~20 mm之间变化,形变速率在-116~9.5 mm/a之间变化。时序形变结果表明:最严重的形变区域位于水田寨村组与马崩渔湾村组的交界处,其次是坡体中下部的水田寨村组,坡体后部的拉海拉湾村组的形变程度最小。

Aiming at the problem of space-time resolution of the traditional surface deformation monitoring technologies in the area of deformation monitoring of the deep layer accumulation landslide in China’s southwestern mountain area,this paper used 72 Sentinel-1 A TOPS SAR images to acquire time series deformation characteristic of Xishancun landslide in Tonghua township,Li county,Sichuan province between 2016 and 2019 based on small baseline subset(SBAS)technology.The results showed:Xishancun landslide appeared a movement trend of approximately linear settlement.Its deformation had not the phenomenon of accelerated settlement during the monitoring period,and was in a long-term active creep.The time series deformation presented a uniform change,which accorded well with the slope morphology.Its cumulative deformation along the line of sight of radar changed between-315.2 mm and 20 mm,and the deformation rate changed between-116 mm/a and 9.5 mm/a.The time series deformation showed that the most serious deformation area was located at the common boundary of Shuitian Zhai village group and Mabeng Yuwan village group,followed by the Shiutian Zhai village group in the middle and lower part of the slope,and the slope body in Lahai Lawan village group at the rear of the landslide had the minimal deformation.