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Remote Sensing for Natural Resources    2023, Vol. 35 Issue (2) : 212-219     DOI: 10.6046/zrzyyg.2021413
A time-series InSAR-based analysis of surface deformation of hydro-fluctuation belts and the effects of hydrological elements
PAN Jianping(), FU Zhanbao(), DENG Fujiang, CAI Zhuoyan, ZHAO Ruiqi, CUI Wei
School of Smart City, Chongqing Jiaotong University, Chongqing 400074, China
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Hydro-fluctuation belts are frequently struck by geological disasters. Therefore, ascertaining the effects of hydrological factors such as reservoir water level and rainfall on the surface deformation of these belts is of great significance for the early warning, prevention, and control of geological disasters. Based on 63 scenes of Sentinel-1 ascending images of the Fengjie section of the Three Gorges Reservoir Area from July 2018 to July 2020, this study conducted the inversion of surface deformation using the small baseline subset interferometric synthetic aperture Radar (SBAS-InSAR) technique. The inversion results were compared with the data of ground monitoring points, and the hydrological elements were analyzed using the time series diagrams of deformation, reservoir water level, and monthly rainfall. The conclusions are as follows: ① The change in the reservoir water level and rainfall are important factors causing surface deformation. The effects of the change in the reservoir water level on the slope are primarily reflected in the buoyancy effect and the water level difference inside and outside the slope. In comparison, rainfall can decrease the shear strength and increase the dead weight of the slope, thus further increasing the deformations; ② Quicker change in the reservoir water level corresponds to larger surface deformation, and vice versa; ③ Rainfall is directly proportional to surface deformation and totally dominates the surface deformation in the case of extremely heavy precipitation; ④ The surface of the study area is stable overall. However, two deformation anomaly zones have been found near the hydro-fluctuation belt. They have annual deformation rates of over 30 mm/a, with a maximum of up to 89 mm/a within the anomaly zones. The above conclusions have high theoretical and practical values and can provide scientific support for the accurate prevention and control of geological disasters in hydro-fluctuation belts.

Keywords hydro-fluctuation belt      hydrological element      deformation mechanism      SBAS-InSAR      Fengjie section of Three Gorges Reservoir     
ZTFLH:  P237  
Issue Date: 07 July 2023
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Jianping PAN
Zhanbao FU
Fujiang DENG
Zhuoyan CAI
Ruiqi ZHAO
Cite this article:   
Jianping PAN,Zhanbao FU,Fujiang DENG, et al. A time-series InSAR-based analysis of surface deformation of hydro-fluctuation belts and the effects of hydrological elements[J]. Remote Sensing for Natural Resources, 2023, 35(2): 212-219.
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Fig.1  Location map of the study area
属性 参数
轨道方向 升轨
成像模式 干涉测量宽幅模式
波段 C
波长/cm 5.6
分辨率/m 5×20
重访周期/d 12
轨道号 26
极化方式 VV
Tab.1  Satellite image parameters
Fig.2  Connection diagram of interference
Fig.3  Annual average deformation rate map
Fig.4  Verification comparison chart
ZDL01 -21.3 -18.8 +2.5
ZDL02 -8.4 -6.6 +1.8
Tab.2  Validation of results(mm)
Fig.5  Deformation process of region 1
Fig.6  Deformation process of region 2
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