中文摘要：

针对暴雨洪水对超采区浅层地下水位不断下降趋势的缓解作用问题,以海河南系平原＂96.8＂暴雨洪水为例,采用时间序列异变特征和趋势分析方法,基于该区逐月地下水位动态长观资料和降水资料,通过对暴雨洪水主要区域的浅层地下水位急剧变化特征和不同时段变化趋势研究,结果表明：（1）类似＂96.8＂的暴雨洪水对减缓海河南系平原区浅层地下水的区域性超采趋势具有显著作用,暴雨洪水的充分补给是该平原区地下水均衡不可缺少的补给模式,＂96.8＂暴雨洪水对地下水资源的补给增量达每百平方公里0.69亿～1.07亿m3;（2）暴雨洪水补给地下水过程主要发生在冲洪积平原区的河道带与汇水洼地等强入渗区域,呈线状、斑块状选择性补给分布特征,具有客观的自然属性;（3）近30年以来海河南系平原区浅层地下水位不断下降,与该区地下水补给水源和补给量不断减少有一定关系。因此,保障暴雨洪水对平原区地下水系统合理补给应是有效缓解区域地下水超采状况的重要方面。

英文摘要：

Aiming at the problem of alleviating the decline trend of the shallow groundwater level with the recharging rainstorm flood, a case in early August of 1996 in the southern plain of the Haihe River basin where the groundwater is serious in the over exploitation. The variation characteristics of the shallow ground- water level and its trend in different period were studied by using the time series variation characteristics method and the trend analysis method based on the monthly groundwater level dynamic data and the precip- itation observed data in this area. The results show that： （1） Storm floods similar to that of 1996 have dis- tinct effect in alleviating the over-exploitation trend of the shallow groundwater in the southern plain of the Haihe River basin, and is the indispensable supply mode in the balance of groundwater under the plain, which recharged 69-107 million m3 per 100 km~ to the groundwater during the big flood in 1996; （2） The main recharge process of the flooding to the groundwater occurs in the river channel and low-lying flood-prone areas in the alluvial plain, presenting linear and sheet infiltration and recharge features with natural attribute; and （3） The shallow groundwater levels continue to decline is related to the reduction of the groundwater recharge source in the plain during the past 30 years. Therefore, to ensure the rainstorm flood recharging to the groundwater should be an important approach in alleviating the over-exploitation situ- ation of the regional groundwater in the plain.