Time-Series InSAR Monitoring And Analysis Of Typical Geological Hazards In Heifangtai Area

The loess plateau is widely distributed in China.These areas have been washed away by the Yellow River and its tributaries all the year round,resulting in numerous terrains and frequent geological hazards.The Heifangtai area in this study area is located in the Loess Plateau.Since human activities have destroyed the balance of the local ecosystem,the geological hazards of the loess type occured frequently,and it still cannot be solved.The effective prevention and control of geological hazards has become an urgent problem to solve in the Blackfangtai area.Interferometric Synthetic Aperture Radar has great potential for monitoring geological hazards.Aiming at the two typical geological hazards in the Heifangtai area,This paper employs the InSAR technology to explore the factors that affect its deformation,which is important to prevent and controll geological hazards in the Loess Plateau.(1)This paper analyzes two typical geological hazards,namely regional settlement and landslide in the Heifangtai area.In order to research the factors by caused it,the platform top and the platform edge are discussed respectively.According to the analysis of the deformation of the mesa regional settlement,the main factor causing its deformation is that the local dry and wet balance is broken due to artificial irrigation activities.The platform edge area is the main distribution area of the landslide group,so the exploration of the landslide problem is mainly for the rim area.The main factors causing deformation in the marginal area are irrigation,temperature and precipitation.Irrigation causes a large amount of external water sources to infiltrate into the ground,and the loess is collapsible.This also makes natural conditions such as temperature and precipitation an important cause of deformation in landslide areas.(2)The experimental data of this paper is Sentinel-1 data,and the data coverage time is from 2015 to 2019.The data processing technology adopts the IPTA technology based on multi-master image mode,which effectively overcomes the problem of timespace loss coherence in InSAR technology through the best baseline combination.Through the processing of the data,it is found that the main deformation zones in the Heifangtai area are distributed in the black basin and the edge of the square,and several major landslide groups are formed.Most of the terrain in these areas is steep,the slope is large,the soil structure is loose,and geological hazards such as collapse and slip are extremely prone to occur.In addition,in addition to the Taiyuan area,there is also a regional and large-scale settlement phenomenon on the countertop.As a daily activity place for local people,the settlement of the countertop can not be ignored.(3)This paper uses the SBAS-InSAR technology,which is also a multi-master image mode,to process the study area and compare it with the data obtained by IPTA technology.