利用观测孔中地下水位潮汐效应计算天津滨海新区含水层参数

在沿海地区,尤其是围海造陆工程形成的陆域地区地下水水位受潮汐影响较大,使传统水文地质试验求取含水层参数存在较大误差。因此通过合理概化地下水在潮汐作用下运动规律,建立数学模型,推导解析公式求取沿海含水层参数具有重要意义。分析天津滨海新区两处观测孔地下水位及潮汐波动特征,在滞后时间不明显的情况下,利用观测孔水位变幅数据计算了含水层水头扩散系数,并根据承压含水层储水系数经验值进一步获得含水层渗透系数。通过两个观测孔分别计算,对比计算结果互相验证发现,该方法取得了令人满意的结果。利用地下水潮汐效应计算含水层参数可以广泛应用于沿海地区水文地质工作中。

Estimation of shallow aquifer parameters using groundwater level tidal fluctuations at two boreholes in a coastal aquifer

In coastal areas,especially in land reclamation areas,hydrogeological experiments are usually influenced by tidal effect.For instance,groundwater levels cannot be accurately gained during traditional pumping tests.In this paper,the movement of groundwater influenced by the tide is appropriately generalized.Based on existing analytical solution,the aquifer parameters are calculated in the Tianjin Binhai New Area.Because the time lag is not obvious,the amplitude of groundwater levels is used to calculate parameters and the time lag is not used.This method yields a satisfactory result though authenticating each other of two boreholes.Therefore,estimation of aquifer parameter based on groundwater tidal effect has significant practical use and can be applied widely to aquifers in coastal areas.