1. Key Lab of 3D Information Acquisition and Application, Ministry of Education, Beijing 100048, China 2. The State Key Laboratory Breeding Base of Process of Urban Environment and Digital Simulation, Beijing 100048, China 3. School of Resources Environment and Tourism, Capital Normal University, Beijing 100048, China 4. Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing 100048, China 5. Qinghai-Tibet Plateau Research Institute, Chinese Academy of Sciences, Beijing 100101, China
To address the problem that quantitative analysis of uneven subsidence is rare, the authors used the Permanent Scatterer Interferometry (PSI) to monitor land subsidence in the Beijing plain. According to the different shallow surface spatial utilizations, the authors selected 5 typical areas in the subsidence funnel region. Based on spatial autocorrelation analysis and wavelet analysis, the authors quantified the degree of spatial and annual time series uneven subsidence in each area, and studied the influence of different shallow surface spatial utilization and groundwater level variation on spatial and annual time series uneven subsidence. The results are as follows: ①Annual time series subsidence’s Moran index degrees of 5 areas are the same as those of the accumulated subsidence: I5>I3>I1>I2>I4. According to the utilization of shallow surface space, the degree of uneven subsidence of 1, 2, 5 areas are positively correlated with the complexity of space utilization, and the factors affecting the uneven subsidence degree of area 3, 4 are complicated. ②It is found that the variation and duration of groundwater level fluctuation are the main factors affecting the uneven degree of time series subsidence.
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