Yuguo Zhou
ABSTRACT
The over-exploitation of the groundwater in the North China Plain has caused severe subsidence in this area, which has compromised the sustainable development of China's national economy. SBAS time-series analysis (small baseline) was employed in this paper to research the Tianjin Plain. Information was gathered about the surface deformation of a large area of the Tianjin Plain based on comprehensive ASAR data. This paper first, analyzes the distribution of subsidence in Tianjin City on a macro-scale, then quantitatively studies the distribution of subsidence funnels, and finally analyzes the degree of coincidence of actual, recorded groundwater cones of depression and subsidence sites in the Beichen District. The results show that: 1) The leading factor of subsidence in Tianjin City is the depletion of groundwater caused by overuse, which directly leads to subsidence. 2) The center of subsidence in the area of over-exploitation approximately coincides with the groundwater funnel center and shows a tendency of slightly moving towards the northwest as a whole, due to the thickness and properties of the rock and soil, specifically the solidification speed of the soft soil layer is slower than that of hydraulic head changes of underground water after groundwater exploitation. This study lays a foundation for the control of groundwater exploitation and the establishment of a model of sustainable exploitation of groundwater in the future.
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