Coupling relationship between land subsidence and groundwater in Beijing-Tianjin-Hebei region based on GRACE data

doi:10.13474/j.cnki.11-2246.2022.0147

Abstract

Abstract: The excessive exploitation of groundwater has caused serious ground subsidence in Beijing, Tianjin and Hebei. In order to analyze the coupling relationship between groundwater and ground subsidence, firstly, the groundwater change sequence in Beijing-Tianjin-Hebei region from 2016 to 2019 is performed by using GRACE-FO data and GLDAS data; Then the time series of the subsidence change in the same period of the region is performed by using the technology of MCTSB-InSAR. In the experiment part, the differential change sequence and trend line of ground water and ground settlement are obtained respectively, and the influence of groundwater on ground settlement is analyzed by using inelastic storage coefficient. The results show that:①when the groundwater reserves increase or decrease rapidly, the ground subsidence rate decreases or increases. When the groundwater continues to rise, the ground subsidence is close to stop.②The more serious the settlement, the stronger the correlation between groundwater and ground subsidence.③The capacity of settlement caused by groundwater change increases with the increase of settlement level, and the change trend of the capacity with time is also different in different settlement grades.

Key words: GRACE, groundwater, land subsidence, InSAR, coupling relationship

CLC Number:

P237

ZHANG Yupeng, ZHANG Yonghong, LIU Qinghao. Coupling relationship between land subsidence and groundwater in Beijing-Tianjin-Hebei region based on GRACE data[J]. Bulletin of Surveying and Mapping, 2022, 0(5): 89-94,125.

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