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Two-dimensional ground deformation monitoring in Shanghai based on SBAS and MSBAS InSAR methods

Shaochun Dong1 Sergey Samsonov2 Hongwei Yin 1 Lulu Huang1
1 School of Earth Sciences and Engineering, Nanjing University, Nanjing China;2 Canada Centre for Mapping and Earth Observation, Natural Resources, Canada;

Abstract: Shanghai has experienced the greatest land subsidence in China in the past sixty years and produced undesirable environmental impact. However, horizontal ground deformation has not been understood yet. Therefore ground deformation monitoring together with the analysis of its driving forces are critical for geo-hazards early-warning, city planning and sustainable urbanization in Shanghai. In this paper, two-dimensional ground deformation monitoring in Shanghai was performed with SBAS and MSBAS InSAR methods. Twenty-nine Multi-Look Fine 6 (MF6) Radarsat-2 SLC data acquired during 2011-2013 were used to derive vertical ground deformation, meanwhile six descending Multi-Look Fine 6 (MF6) and four ascending Multi-Look Fine 2 (MF2) spanning April to August, 2008 were used to derive vertical and horizontal ground deformation during the observation period. The results indicate that vertical and horizontal deformation in 2008 were not homogeneously distributed in different districts ranging from 0-2 cm/year. Vertical deformation rate during 2011-2013 were decreased to less than 1cm/year in most district of Shanghai area. Groundwater exploitation and rapid urbanization are responsible for most of the ground deformation in Shanghai, thus future ground deformation in vertical and horizontal directions should be warranted.

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Keywords:Shanghai; SBAS InSAR; MSBAS InSAR; ground deformation; ground fissures

DOI:
10.1007/s12583-017-0955-x
CLC number:
U469.72
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