Spatial-temporal variation of groundwater and land subsidence evolution in Beijing area
Precipitation is the main recharge source of groundwater in the plain of Beijing, China. Rapid expansion of urbanization has resulted in increased built-up area and decreased amount of effective recharge of precipitation to groundwater, indirectly leading to the long-term over-exploitation of gr...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-11-01
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| Series: | Proceedings of the International Association of Hydrological Sciences |
| Online Access: | https://www.proc-iahs.net/372/7/2015/piahs-372-7-2015.pdf |
| Summary: | Precipitation is the main recharge source of groundwater in the plain of
Beijing, China. Rapid expansion of urbanization has resulted in increased
built-up area and decreased amount of effective recharge of precipitation to
groundwater, indirectly leading to the long-term over-exploitation of
groundwater, and induced regional land subsidence. Based on the combination
of meteorological data, groundwater level data, interferometric synthetic
aperture radar (InSAR; specifically persistent scatterer interferometry,
PSI), geographic information system (GIS) spatial analysis method and
rainfall recharge theory, this paper presents a systematic analysis of
spatial-temporal variation of groundwater level and land subsidence
evolution. Results show that rainfall has been decreasing annually, while the
exploitation of groundwater is increasing and the groundwater level is
declining, which is has caused the formation and evolution of land
subsidence. Seasonal and interannual variations exist in the evolution of
land subsidence; the subsidence is uneven in both spatial and temporal
distribution. In 2011, at the center of mapped subsidence the subsidence rate
was greater than 120 mm a<sup>−1</sup>. The results revealed good
correlation between the spatial distribution of groundwater level declines
and subsidence. The research results show that it is beneficial to measure
the evolution of land subsidence to dynamic variations of groundwater levels
by combining InSAR or PSI, groundwater-level data, and GIS. This apprpach
provides improved information for environmental and hydrogeologic research
and a scientific basis for regional land subsidence control. |
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| ISSN: | 2199-8981 2199-899X |