Subsidence Monitoring And Land Use Change In Shendong Mining Area Based On Time Series InSAR Technoligy

As one of the most abundant mineral resources in my country,coal is the lifeblood of national economic development.At present,coal mining activities are becoming more and more frequent,leading to large-scale surface subsidence,changes in land use and land cover forms in mining areas,deterioration of the ecological environment,and frequent occurrence of geological disasters,which directly affect the lives of residents in surrounding mining areas and the safety of industrial production.Based on Sentinal-1A data and Landsat data,Persistant Scatterers Interferometric Synthetic Aperture Radar,Persistant Scatterers interferometric synthetic aperture Radar,PS InSAR and Small Baselines Subset Interferometric Synthetic Aperture Radar(SBAS InSAR),which adopt supervised classification method,The subsidence monitoring of Shendong mining area is carried out,the subsidence monitoring technology suitable for the study area is selected,the subsidence characteristics of Shendong mining area are mastered,and the land use change in the subsidence area is analyzed from multiple perspectives,in order to provide reference for land reclamation and ecological restoration in the mining area.The main conclusions are as follows:(1)Comparing and analyzing the results of ground subsidence in the study area processed by PS InSAR and SBAS InSAR,it is found that SBAS InSAR technology is more suitable for monitoring ground subsidence in Shendong mining area.(2)Based on SBAS InSAR technology monitoring,the average ground subsidence rate in Shendong mining area is-303.1mm/y.The ground subsidence in the area is mainly distributed in the Bulltai Mine,Bulianta Mine,Shangwan Mine,Huojitu Mine,Daliuta Mine,and Shigetai Mine,and is located in the east and southeast of the Bulltai Mine and Shangwan Mine.The ground subsidence phenomenon is more serious in the western and southern parts of Huojitu Mine,and in the northwestern and northern parts of the Huojitu Mine.The subsidence in the above areas has a wide range and a large range;The maximum cumulative subsidence in the mining area is distributed in Buertai Mine,which is-352.61mm;The subsidence area of No.2 and No.3 subsidence areas increases with time,and the subsidence degree continues to deepen.The subsidence area of No.1subsidence area remains basically unchanged,and the subsidence amount of No.1subsidence area is less than that of No.2 and No.3 subsidence areas.(3)The change of grassland and unused land area in the study area showed a significant decreasing trend from 2009 to 2021,while the construction land area showed a continuous increasing trend;The dynamic attitude of comprehensive land use was0.008%,and the land use change was stable on the whole.In the study area,the area of cultivated land,grassland and forestland interchanged frequently.In the Shendong mining area,the migration distance of various types of land use center of gravity is different.In general,the migration distance of unused land,forest land and grassland is relatively obvious,which is 1.01 km,0.96 km and 0.42 km respectively.The migration distance of water body is the smallest,which is 0.26 km.(4)In different subsidence areas,the area of grassland,forest land and construction land changes greatly and is greatly affected by deformation.The change trend of cultivated land area in different subsidence areas is basically the same,and the subsidence has little effect on cultivated land.The variation of water body and unused land area is small,and the different degree of subsidence has little effect on it.In the change of land use in both subsidence and non-subsidence areas of Buertai Mine,the area of construction land increased in both subsidence and non-subsidence areas,and the increased part in subsidence area was greater than the increased part in non-subsidence area.The grassland area increased in the non-subsidence area and decreased in the subsidence area.The forest area decreased in both the non-subsidence area and the subsidence area,and the decrease in the non-subsidence area was greater than that in the subsidence area.In the land use change of Buertai mine in different subsidence stages,the area of construction land increased continuously,the area of forest land decreased greatly,and the area of water body decreased relatively little within three years after the subsidence.Within six years after the subsidence occurred,the area of construction land and grassland decreased,while the area of cultivated land and forest land increased.