Research on temporal and spatial evolution law of land subsidence in Zhengzhou
WANG Baocun1(), ZHU Lin1, PAN Deng2, GUO Lingfei1, PENG Peng3
1. Institute of Surveying, Mapping and Geoinformation of Henan Provincial Bureau of Geo-Exploration and Mineral Development,Zhengzhou 450000, China 2. Henan Geo-Environmental Monitoring Institute, Zhengzhou 450016, China,Zhengzhou 450000, China 3. Geological Survey of Anhui Province, Hefei 230001, China
The monitoring results in recent years show that land subsidence in Zhengzhou has been developed rapidly. In order to find out the evolution law of Zhengzhou’s land subsidence and serve the prevention and control work of urban land subsidence, the authors selected the synthetic aperture Radar(SAR) data in recent years (2007—2017), compiled the land subsidence distribution maps of Zhengzhou in four periods of 2007—2010, 2012—2013, 2013—2016 and 2016—2017 by combining with the bench-mark monitoring results, and analyzed the evolution law of Zhengzhou’s land subsidence from time and space. By the GIS room analysis method, the authors studied the space-time response relation between land subsidence and urban village evolution in recent years. Research results show that the urban village is the predominant factor in the land subsidence evolution of Zhengzhou, namely, the groundwater abstraction in urban village causes land subsidence; the relocation of urban village and reduction of groundwater abstraction cause slow land subsidence and even uplift of land subsidence; the relocation causes the floating population to move to outer suburbs, which forms a new floating population and industrial accumulation area, and further forms a new ground subsidence area.
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WANG Baocun, ZHU Lin, PAN Deng, GUO Lingfei, PENG Peng. Research on temporal and spatial evolution law of land subsidence in Zhengzhou. Remote Sensing for Land & Resources, 2020, 32(3): 143-148.
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