Relationship Between Land Subsidence and Deep Groundwater Yield in the North China Plain
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Abstract:
Due to long-term excessive groundwater exploitation, the North China Plain has become an area with the most excessive groundwater pumping, the largest area of groundwater depression cones and land subsidence, and the most complex subsidence type in the world. In this paper, GIS spatial analysis method was used to conduct comparative analysis of deep groundwater yield and land subsidence in the North China Plain and Cangzhou City. The results showed that the annual subsidence volume of the North China plain is 10.73×108 m3 until 2010 while the annual deep groundwater yield is about 24.5×108～26.75×108 m3. Therefore, the land subsidence volume accounted for 40.1% to 43.8% of deep groundwater yield in the North China Plain, indicating the proportion of released water from the compressibility of aquifer and the aquitard of the total deep groundwater yield. The annual subsidence volume was 1.98×108 m3 and the annual deep groundwater yield was about 3.44×108 m3 in Cangzhou region between 1970 and 2008. The proportion of subsidence volume of total deep groundwater yield was 57.6%, which was much higher than that of the North China Plain and can be explained by the lithological structure and recharge conditions of deep groundwater in Cangzhou region.
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