海潮引起滨海含水层地下水位变化的初步研究

    Groundwater level changes of coastal aquifers caused by tides

    • 摘要: 依据短序列和长序列的潮汐效应观测数据,分析了北海地区海潮引起滨海含水层地下水位变化的动态特征。结果表明。受海潮影响的滨海含水层地下水位与海潮有相似的波动特征,但变幅减小,受海潮的影响程度与观测点离海岸的距离有关,随着离海岸距离的增加地下水位的变幅和潮汐系数大致呈负指数减小。在南、北海岸距离海岸分别达3756m和2276m以远时地下水位不受海潮变化的影响。长序列的观测资料显示,海潮和岸边地下水位有15天的长周期和1天的短周期的波动。

       

      Abstract: The paper analyzes the dynamics of groundwater level change in coastal aquifers influenced by tides in the Beihai area based on short- and long-series observations of tidal effects. The results indicate that the groundwater level of coastal aquifers under tidal influence has similar fluctuation features to those of tides but the magnitude of groundwater level fluctuation is smaller than that of tides. The tidal influence on the groundwater level fluctuation or tidal coefficient is related to the distance of the observation station from the coast. The magnitude of groundwater level fluctuation or tidal coefficient roughly decreases exponentially. The groundwater level is thought to be free from the tidal influence when the distances from the southern and northern coasts are 3756 and 2266 m respectively. The data of the long-series observations also show that the tides and groundwater level at the coast fluctuate in a long period of about 15 days and a short period of about 1 day.

       

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