Calculation And Analysis Of Influence Of Environmental Load Deformation In Xinjiang Region

With the ever-increasing capabilities of modern space geodetic observation techniques and data processing analysis,the effects of various non-linear environmental loads on geodetic factors must be taken into account,especially atmospheric,soil,and terrestrial waters.Based on the theory of elastic load deformation,the paper uses the ECMWF global atmospheric model data,atmospheric pressure data in the Chinese surface climate data daily dataset,CPC soil water data,terrestrial water model data,and GNSS observation station data in the CMONOC.Harmonic coefficient method and Green's function integral method have been used to calculate the effects of changes in atmospheric load,soil water,and terrestrial water on the geoid,vertical deformation of the crust,horizontal deformation of the crust,vertical deviation,and ground gravity in the Xinjiang region.The earth's height is analyzed for environmental load corrections.The main work and achievements of the paper are as follows:(1)Summarize the previous research results,and based on this,we give the load deformation Green's integral function to calculate the geodetic component deformation formula and the spherical harmonic coefficient to calculate the geodetic factor deformation formula.(2)Using the removal-recovery method to comprehensively process global atmospheric data and measured data from weather stations to obtain the influence of changes in atmospheric load on geodetic factors.The results show that the effect of atmospheric load change on the geoid of the study area is-3-9mm,and the annual variation is 10mm;the effect of the vertical deformation on the crust is 24mm;the effect on the horizontal deformation of the crust is small,about 2mm;The influence of the vertical deviation is 5ms;the maximum gravity impact on the ground is-5?Gal,and the minimum is-8?Gal,which is negatively correlated with the pressure change.(3)The spherical harmonic coefficients method was used to calculate the effect of changes in soil water load on the deformation of geodetic elements.The results show that the effect of soil water load on the geoid of the study area can reach 6mm,the annual variation is 7mm;the effect of the vertical deformation of the crust is 12mm;the impact on the horizontal deformation of the crust is 1.7mm;The annual variation of the influence of the deviation is 8ms;the annual variation of the influence on the ground gravity is 10?Gal,which is equivalent to the impact of atmospheric load.(4)The effect of land-water load variation on the deformation of geodetic elements was calculated using the spherical harmonic coefficient method.The results show that the impact of land-water load change on the geoid of the study area is between-2-5mm;the annual variation of the impact on the vertical deformation of the crust is about 12mm;the maximum impact on the horizontal deformation of the crust is 4mm;The maximum impact is 10ms;the effect on ground gravity is up to 15?Gal.(5)Gross error detection and removal of CORS station time series to repair steep changes.The fitting model was used to separate the effect of structural deformation and the resulting deformation of the station's environmental load affected the time series.Calculate the effects of atmospheric,soil,and terrestrial water loads on the vertical deformation at the CORS site.By comparing with the time series of the station's environmental deformation,the vertical effect of the atmospheric load is the same as that of the station's high earth change,and it has a strong correlation;the change of the soil water and land water load has little effect on the vertical deformation of the station,showing a year Cycle changes.By correcting the effect of atmospheric and soil water on the height of the station,the RMS at most sites is reduced and the observation quality is significantly improved.