Zongyu Chen, Zhenlong Nie, Zhaoji Zhang, Jixiang Qi, Yunju Nan
Department of Water Resources and Environmental Engineering, China University of Geosciences, Beijing, People's Republic of China.
Ground Water. 2005 Jul-Aug;43(4):485-93. doi: 10.1111/j.1745-6584.2005.0038.x.
Ground water in deep confined aquifers is one of the major water resources for agricultural, industrial, and domestic uses in the North China Plain. Detailed information on ground water age and recharge is vital for the proper management of these water resources, and to this end, we used carbon 14 of dissolved inorganic carbon and tritium in water to measure the age and determine the recharge areas of ground water in the North China Plain. These isotopic data suggest that most ground water in the piedmont part of the North China Plain is <40 years old and is recharged locally. In contrast, ground water in the central and littoral portions of the North China Plain is 10,000 to 25,000 years old. The delta18O (deltaD) values of this ground water are 1.7 per thousand (11 per thousand) less than that in the piedmont plain ground water and possibly reflect water recharged during a cooler climate during the last glaciation. The temperature of this recharge, based on delta18O values, ranges from 3.7 degrees C to 8.4 degrees C, compared to 12 degrees C to 13 degrees C of modern recharge water. The isotopic data set combined indicates that ground water in the central and littoral part of the North China Plain is being mined under non-steady state conditions.
深层承压含水层中的地下水是华北平原农业、工业和生活用水的主要水资源之一。关于地下水年龄和补给的详细信息对于合理管理这些水资源至关重要，为此，我们利用水中溶解无机碳的碳14和氚来测量华北平原地下水的年龄并确定其补给区域。这些同位素数据表明，华北平原山前部分的大多数地下水年龄小于40年，且为局部补给。相比之下，华北平原中部和沿海地区的地下水年龄为10000至25000年。该地下水的δ18O（δD）值比山前平原地下水低1.7‰（11‰），可能反映了末次冰期较冷气候期间补给的水。根据δ18O值，这种补给的温度范围为3.7℃至8.4℃，而现代补给水的温度为12℃至13℃。综合同位素数据集表明，华北平原中部和沿海地区的地下水正处于非稳态开采状态。
