鲁北平原地下水同位素年龄及可更新能力评价

Isotope Age of Groundwater in Lubei Plain and an Evaluation of Its Renewable Capacity

笔者采用大量的地下水环境同位素数据,利用天然放射性氚和14C的通用测年技术,分别估算浅、深层地下水的形成年龄,评价地下水的可更新能力。研究结果表明,鲁北平原浅层地下水的主要补给来自当地的大气降水和引黄河灌溉水,循环速度较快,循环时间20～50a,更新能力较强。深层地下水主要起源于古代大气降水,是在比现在寒冷的气候条件下由大气降水入渗形成,循环速度较慢,循环时间8～20ka,更新能力较弱。

In this paper, a large number of groundwater environmental isotope data and the common measurement technology for natural radioactive tritium and ^14C were used to estimate the formation age of shallow and deep groundwater and evaluate the renewable capacity of groundwater. The results show that the main supply of shallow groundwater in Lubei plain is the local atmospheric precipitation and the surface irrigation water from the Yellow River, whose recycle is fast with a cyclic period of 20-50 years. Hence, the renewable capacity is strong. The deep groundwater mainly originated from ancient atmospheric precipitation in a cold climate, whose recycle is slow with a cyclic period of 8000-20000 years. And hence its renewable capacity is weak.