Deformation Evaluation of the South-to-North Water Diversion Project (SNWDP) Central Route over Handan in Hebei, China, Based on Sentinel-1A, Radarsat-2 and, TerraSAR-X Datasets

The South-to-North Water Diversion Project (SNWDP) is a megaproject which has been constructed to alleviate imbalanced water resource distribution between northern and southern China. It encompasses three routes distributed in the east, central, west of China, respectively. central route (CR) SNWDP starts from Danjiangkou Reservoir ends Beijing Tianjin, running through Hubei, Henan, Hebei Provinces; it service since December 2014. For this type megaproject, efficient effective safety monitoring during its operation highly challenging management department. Multitemporal interferometric synthetic aperture radar (MT-InSAR) widely applied land deformation, especially wide area. However, ability show deformation one specific facility along SNWD not deeply investigated. This study investigates capability MT-InSAR canal ancillary facilities SNWD-CR over Handan, Province, using Sentinel-1, Radarsat-2, TerraSAR-X datasets. Deformation rates March 2015 2016 are obtained by applying permanent scatterers (PS)-InSAR these SAR After combining derived datasets, SNWDP-CR evaluated method encompassing median absolute deviation (MAD) calculation heatmap. evaluation result reveals that part western embankment open subsiding at up 10 mm/year, may be associated with overirrigation. Besides location, most dangerous areas assessed proposed related facilities, mainly aqueducts crossing-canal bridges.