InSAR Monitoring Of Ground Subsidence In The Huainan Mining Area

Huainan City is built as a coal mining city, a lot of environmental and geologicalproblems have been caused by underground mining of coal resources, the groundsubsidence in mining areas and the surrounding is the most direct and generalperformance. The great dangers of ground subsidence make monitoring an urgent andmeaningful work.Synthetic aperture radar interferometry (or InSAR), which own theadvantage of all-weather, all-time, high-resolution and continuous space coverage,can meet the requirements of regional subsidence monitoring. It also makes up thetraditional measurement disadvantage such as the intensity of labor, observation basedon discrete points and so on. So InSAR has greater advantages and good prospects inapplying to the surface subsidence monitoring of mining area.This paper describes the imaging principle, the advantage and the developmentof SAR, InSAR and D- InSAR technology. Based on this, it described in detail theapplication of InSAR technology to extract the DEM of study area, as well as thealgorithm process of D-InSAR technique to extract the surface deformation takenthree-track method for example. 4 TerraSAR-X data was selected to extract the DEMof Huainan mining area, and its accuracy is significantly better than the DEM data ofUnited States SRTM-3 data. Then followed by the two-track method known DEMafter registration, go flat, filtering, phase unwrapping, orbit refinement, the seconddifference, geocoding steps to extract the Huainan mining area ground subsidencevalues of three time periods.The main conclusions are as follows:(1) It confirmed that the InSAR technique has very obvious advantagescompared with traditional measurement technology;(2) the data algorithm and the process used in this paper is generally rational.The trend of the 5m resolution DEM is in accordance with the SRTM-3 DEM of 90 mresolution, and its accuracy is significantly higher than the SRTM-3 DEM.(3) About 926.92km2 turns out ground subsidence during the monitoring period of 352 days, and most of the subsidence values are up to 10 cm, individual regions aremore serious.(4) The ground subsidence of the old mining in Huaihe River south bank is moreserious than the new mine in Huaihe River north bank.(5) Because of the deficient research data, ground subsidence values obtainedexist some errors. suggest that apply more Radar data for further study, or useInSAR and GPS in combination to rational use of the complementarity between thevarious technical to obtain more accurate results...