Deformation analysis of the Trondheim city from SAR Interferometry

Abstract

Trondheim is a coastal city in central Norway, which lies on the south shore of the Trondheim Fjord. Because of the river Nidelva, which runs through the city, floods, erosion and landslides, are occurring in and along the river. Therefore, displacement monitoring of the city is important. In this study, 31 SAR images acquired in a descending track from TerraSAR-X are used to assess ground deformation in Trondheim during 2012–2014. The data is processed using InSAR time-series technique of Small BAseline Subset (SBAS) approach. The results show displacement with peak value of approx. -10 mm/yr on the coastal area and more than -5 mm/yr in the clayey areas along the river. We found that the spatial pattern of the displacement field is correlated with the deposit thickness.