中文摘要：

采用氯离子示踪技术确定干旱一半干旱地区地下水垂向入渗补给量对于揭示地下水补给的空间变化规律，完善地下水资源评价的理论与方法，具有重要理论与现实意义。利用天然环境氯离子示踪法评价了河北平原典型区地下水垂向入渗补给量，结果表明该方法在山前冲洪积平原水位埋深大的淡水区应用效果较好，鹿泉和栾城的补给量分别为44．72mm／a和31．31mm／a，占多年平均降雨量的8．2％和5．8％，以扩散流入渗为主；在中部冲湖积平原和滨海冲积海积平原由于天然环境氯离子浓度背景值高、水位埋深浅以及近海输入氯离子的波动性较大，该方法的应用受到一定程度的限制。

英文摘要：

Using chloride ion tracer method to estimate the vertical infiltration recharge of groundwater in arid and semi-arid region has important theoretic and practical value for exploring spatial variation rule of groundwater recharge and improving evaluating theo ry and method for groundwater resources. The method was adopted to estimate the vertical infiltration recharge of groundwater in representative region of Hebei plain in this paper. The results showed that the method had good application effect in fresh water zone with deep groundwater depth in piedmont alluvial plain. Recharge rates in Luquan city and Luancheng city are 44.72mm/a and 31.31 mm/a, which account for 8. 2% and 5.8% of the mean annual rainfall, respectively. The flow is mainly diffusion flow. While application of this method is limited to some extent in central alluvial lacustrine plain and coastal alluvial plain because of the high hackground of chloride ion concentration, shallow groundwater depth, and the larger fluctuation of the input chloride in coastal plain.