【摘要】 浅层地下水位动态是外界各因素对地下水激励的一个综合响应结果,大气压对浅层地下水位有着重要影响,正确分析这种影响可以有效识别降雨入渗引起的地下水位回升信息。本文分析了华北平原衡水地区大气压变化特征,进行了大气压变化与自动水位计观测的对比分析试验,并结合野外长期监测孔的高频浅层地下水位动态数据,分析了浅层高频地下水位动态观测中的气压响应特征。结果表明:监测孔中的自动水位计不仅记录了地下水位动态,也记录了大气压变化信息;浅层高频地下水位与大气压具有同步变化的特征,两者日周期的峰值出现在9∶00—10∶00,谷值出现在15∶00—16∶00;降雨影响大气压在浅层高频地下水位动态中的响应;选择不同的监测时段,利用浅层高频地下水位监测信息,区分降雨、灌溉和深层开采的影响,从而可以进行地下水的垂向入渗补给量计算。更多还原

【Abstract】 Shallow groundwater level dynamic is a result of comprehensive response of external factors.Atmospheric pressure has important influence on the shallow groundwater level.The correct analysis of this effect can effectively identify the groundwater recovery information caused by the rainfall infiltration.This paper analyzes the changing characteristics of atmospheric pressure in Hengshui region of North China Plain,and discusses the pressure changes and the observation method of automatic water level gauge;then, combining the dynamic data of long-term monitoring groundwater level in field,it analyzes the atmospheric pressure response characteristics in groundwater level dynamic.The results show that:automatic groundwater level gauge records not only the dynamic information of groundwater level,but also the changing information of atmospheric pressure;the high frequency groundwater level and atmospheric pressure are of synchronous change,and the peak values of their daily cycle both appear at 9:00—10:00and the valley values at 15:00—16:00;rainfall can affect the response of pressure in the groundwater level dynamic with high frequency;choosing monitoring data of different periods and using groundwater level with high frequency information will help distinguish the different effects of rainfall,irrigation and deep pumping on the shallow groundwater level and calculate the vertical groundwater recharge.更多还原