中文摘要：

地下水位动态变化是外界影响因素的反映,微观动态也受到外界长期周期性影响。根据在华北平原设置的自动监测设备监测的高频率水位资料,利用频谱分析方法分析了地下水位微观动态,确定了周期变化特征。与天体潮汐所体现出的周期特征对比,说明华北平原（北京除外）大多数观测孔都受到天体潮汐作用的周期影响：其中沿海的部分浅层含水层地下水与海潮潮汐作用有关,个别观测孔受蒸散发作用影响体现出日变化;内陆大多数深层观测孔和个别浅层观测孔微动态受固体潮汐作用影响,反映了不同地区的含水层以及岩性特征。

英文摘要：

Groundwater dynamics can reflect the influence factors and the micro-dynamics of groundwater maybe affected by the periodic influence factors which exist for a long term. In this paper the results of automatic groundwater monitoring data loggers KADEC-MIZU Ⅱ of Japan were used to analyze the microdynamics of groundwater. Spectral analysis method was used to determine the period feature of different wells. Compared with the results of previous research which made sure the period affected by the astronomic tide,the groundwater micro-dynamics of most observed well were affected by the astronomic tide. Some shallow groundwater of the coastal area was related with the tide effect except two wells which were related with the evapotranspiration effect. However,the micro-dynamics of most deep groundwater and several wells inland may be related with the astronomic tide which is caused by the aquifer property or the rock property.