Khoramdarreh Subsidence Estimation Using SAR Interferometry and Investigation its Risks

Subsidence is a downward motion of ground surface with small horizontal displacement vector. It may happen due to natural factors or human activities. In Iran,subsidence may occurbecause of the human activities and excessive extractionof groundwater resources. In this study, we applied Synthetic aperture Radar Interferometry (InSAR) to investigate the rate of subsidence. We estimatedthe rate of subsidence in Khoramdareh plain using Permanent Scattering (PS) for the duration time 2003-2005. The mean velocity map indicated that the subsidence is occurring with the rate of 35 mm/yr in direction of Satellite Line of Sight. Afterward, we used Geospatial Information System (GIS) to evaluate the risks of subsidence. The results show some parts of the railways, main roads and highways are affected by subsidence.