Abstract
Abstract. Groundwater in Beijing has been excessively exploited in a long time, causing the groundwater level continued to declining and land subsidence areas expanding, which restrained the economic and social sustainable development. Long years of study show good time-space corresponding relationship between groundwater level and land subsidence. To providing scientific basis for the following land subsidence prevention and treatment, quantitative research between groundwater level and settlement is necessary. Multi-linear regression models are set up by long series factual monitoring data about layered water table and settlement in the Tianzhu monitoring station. The results show that: layered settlement is closely related to water table, water level variation and amplitude, especially the water table. Finally, according to the threshold value in the land subsidence prevention and control plan of China (45, 30, 25 mm), the minimum allowable layered water level in this region while settlement achieving the threshold value is calculated between −18.448 and −10.082 m. The results provide a reasonable and operable control target of groundwater level for rational adjustment of groundwater exploited horizon in the future.
Highlights
Beijing suffered successive droughts since 1999, the precipitation decreased 19 % in recent 12 years
The groundwater has been over exploited in order to ensure the safety of water supply for the capital, the average groundwater depth in Beijing plain decreased from 11.9 m (1998) to 24.3 m (2012), with an average annual decline of 0.89 m, which resulted in intensified development of ground subsidence
According to the annual control targets of land subsidence in Beijing, the threshold values are set as 45, 30, 25 mm.The layered control target of F3–3, F3–4, F3–6 and F3–8 are calculeted by the historical data of settlement.The minimum allowable layered water level in this region while settlement achieving the threshold value can be calculated (Table 3)
Summary
Beijing suffered successive droughts since 1999, the precipitation decreased 19 % in recent 12 years. The groundwater has been over exploited in order to ensure the safety of water supply for the capital, the average groundwater depth in Beijing plain decreased from 11.9 m (1998) to 24.3 m (2012), with an average annual decline of 0.89 m, which resulted in intensified development of ground subsidence. The contradiction between supply and demand of water resources is difficult to solve, the land subsidence will be in sustained and rapid development (Yang et al, 2010). Years of research shows that, the main causes of land subsidence in Beijing plain is groundwater overexploitation. The characteristic of land subsidence development is closely related to the intensity and depth of groundwater exploitation. The speed and magnitude of the groundwater level change directly affect the speed and amount of ground subsidence
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