Monitoring and analysis of seasonal surface deformation in the black soil region of the Songnen Plain from 2016 to 2021
Affected by global climate change,freeze-thaw process,crustal movement,and human activities,surface deformation poses a certain threat to regional production,people's living,and ecology.The black soil region in the Songnen Plain is a vital reservoir of arable land in China and represents a prototypical seasonal frozen soil area.Current monitoring efforts for frozen soil surface deformation have been primarily focusing on high-altitude areas such as the Qinghai-Tibet Plateau,with limited attention to high-latitude regions such as the Songnen Plain black soil area.This study utilized data from 68 scenes of Sentinel-1 synthetic aperture radar images and employed Differential Interferometric Synthetic Aperture Radar(D-InSAR)technology to derive surface deformation data for the melting and freezing periods in 2016 and 2021 in the Songnen Plain black soil area.Through spatial autocorrelation,change transfer matrix,and average center analyses,the spatiotemporal distribution characteristics of surface deformation were investigated.The study also conducted an analysis on the causative factors of surface deformation,considering fault zones,groundwater dynamics,and land use patterns.Key findings include:1)The deformation during the melting period exhibited a higher average and a more significant variation compared to the freezing period.The average deformation during the melting period was 113 mm,with a range from-63 mm to 244 mm.In contrast,the average deformation during the freezing period was 23 mm,with a range from-64 mm to 120 mm.The range of surface deformation variables in the same season from 2016 to 2021 shows convergence.2)Seasonal surface deformation in the Songliao Basin follows a"freeze expansion and thaw subsidence"pattern,with minor deformation observed in the western foothills of the Lesser Khingan Range.During the thawing period,subsidence areas gradually shift northeastward,and uplift areas shift from the northeast to the southwest.During the freezing period,subsidence areas shift from Suihua City to the western part of Qiqihar City,and uplift areas shift from the northwest to the south.3)High-value areas of surface deformation are located along fault zones,and the spatial distribution of surface uplift is correlated with the degree of rock water enrichment.4)Land use patterns significantly influence surface deformation,with croplands most commonly exhibiting surface deformation.In summary,surface deformation in the Songnen Plain black soil area displays both seasonal differentiations and interannual fluctuations.Real-time monitoring of surface deformation and an exploration of its influencing factors can provide valuable insights for agricultural management,groundwater regulation,and geological disaster prevention.
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NSTL
万方数据
