Spatiotemporal Characterization of Land Subsidence and Uplift (2009–2010) over Wuhan in Central China Revealed by TerraSAR-X InSAR Analysis

摘要: The effects of ground deformation pose a significant geo-hazard to the environment and infrastructure in Wuhan, most populous city Central China, eastern Jianghan Plain at intersection Yangtze Han rivers. Prior this study, however, rates patterns region-wide Wuhan were little known. Here we employ multi-temporal SAR interferometry detect characterize spatiotemporal variations major metropolitan areas Wuhan. A total twelve TerraSAR-X images acquired during 2009–2010 are used InSAR time series analysis. InSAR-derived results validated by levelling survey measurements reveal distinct subsidence pattern within six zones commercial industrial areas, with maximum rate up −67.3 mm/year. comparison analysis between subsiding urban developments as well geological conditions suggests that land is mainly attributed anthropogenic activities, natural compaction soft soil, karst dissolution subsurface carbonate rocks. However, activities related intensive municipal construction production have more impacts on measured than factors. Moreover, remarkable signals secular uplift found along both banks River, especially southern bank, ranging mostly from +5 mm/year +17.5 strong temporal correlation highlighted detected displacement evolutions water level records inferring previously unknown phenomenon likely seasonal fluctuations levels River.