Abstract
The groundwater table in the piedmont plain was only about 1–2 m in depth in the 1950s and 1960s, but it lowered dramatically afterwards to about 25–27 m in depth (currently 21–23 m above sea level) due to overpumping of groundwater and drought in the region. This change has adversely affected the sustainable development and food supply of this important agricultural area. The groundwater table at Luancheng Experimental Station of the Chinese Academy of Sciences, located in the piedmont, dropped from 39.36 m in 1975 to 21.47 m above sea level in 1999, at an average rate of 0.72 m/year. Water balance components, such as daily rainfall, pan-evaporation, and evapotranspiration (by lysimeter after 1995) have been recorded since the 1970s, and they were used as variants to simulate monthly water table change based on a physically based statistical model. Groundwater samples were collected during the period 1998–2001, and tritium was measured in the laboratory to trace the groundwater flow from the Taihang Mountains to the piedmont. A reasonable exploitation rate of 150 mm/year was obtained from the model by assuming the annual water table is constant. The recharge and groundwater flow from the Taihang Mountains plays an important role in the water balance of the piedmont area, and it was estimated to be about 112.5 mm/year by using the variation of tritium with the depth, which followed a good exponential function. The simple water balance calculation indicated that the water table could recede at a rate of 0.8 m/year, which is close to the actual situation.
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Acknowledgments
The authors gratefully acknowledge aid grants for scientific research from the Ministry of Education, Culture, Sports, Science and Technology of Japan, (B)(2) 12480146, 2000 and (B)(2) 13480152, 2001 and funds from the Ministry of Sciences and Technology of China, G19990436-01 (National 973 project). We are also grateful to those who helped to collect water samples during the field survey from both Shijiazhuang Institute of Agricultural Modernization, CAS and from various Japanese universities. Thanks are expressed to anonymous referees for improvements to an earlier draft of this paper.
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Chen, J.Y., Tang, C.Y., Shen, Y.J. et al. Use of water balance calculation and tritium to examine the dropdown of groundwater table in the piedmont of the North China Plain (NCP). Env Geol 44, 564–571 (2003). https://doi.org/10.1007/s00254-003-0792-3
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DOI: https://doi.org/10.1007/s00254-003-0792-3