Large area land subsidence monitoring in thePearl River Estuary by InSAR time-series analysis

GAO Hui; LUO Xiaowen; WU Ziyin; YANG Fanlin

doi:10.3969/j.issn.1001-909X.2020.02.009

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Journal of Marine Sciences ›› 2020, Vol. 38 ›› Issue (2) : 81-87. DOI: 10.3969/j.issn.1001-909X.2020.02.009

Large area land subsidence monitoring in thePearl River Estuary by InSAR time-series analysis

GAO Hui^1,2,3, LUO Xiaowen^*1,2,3, WU Ziyin^2,3, YANG Fanlin¹

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Abstract

The Pearl River Estuary (PRE) is one of the coastal areas with serious land subsidence, which forms a serious threat to the quality and safety of human life and production. In response to the problems associated with the lack of man-made targets of traditional time-series Interferometric Synthetic Aperture Radar (InSAR) in estuaries and other coastal areas, a distributed scatterers InSAR (DS-InSAR) method based on a spatially adaptive filter and an eigendecomposition algorithm to estimating the optimal phase of statistically homogeneous DS was applied to obtain the deformation information in PRE between 2015 and 2018. High-density and high-coherence points were extracted in asphalt pavement, bare soil and other non-urban areas, to improve the inversion accuracy. The results suggest that land subsidence in the PRE was widespread and unevenly distributed. The northwest and southeast are the main subsidence areas, with a maximum subsidence rate greater than 25 mm/a.

Key words

Pearl River Estuary / estuarine coastal zone / land subsidence / distributed scatterer / time series

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GAO Hui, LUO Xiaowen, WU Ziyin, YANG Fanlin. Large area land subsidence monitoring in thePearl River Estuary by InSAR time-series analysis[J]. Journal of Marine Sciences. 2020, 38(2): 81-87 https://doi.org/10.3969/j.issn.1001-909X.2020.02.009

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