含水层抽水试验水位恢复过程数据的直线图解分析法

提出了一种分析含水层抽水试验水位恢复过程数据的新方法。该法对水位恢复阶段降深表达式中的两个井函数分别采取了不同的简化方式。对由于持续抽水引起的降深项，保留了井函数级数展开式中的前两项；对由于在停抽时刻开始的虚拟注水而引起的降深项，保留了展开式中的前三项。在这样的简化方式下，分别推导了具有降深-时间和降深-距离两种数据情况下的参数计算公式。与现有方法相比较，本方法具有使用条件容易得到满足，不需要水泵停抽时刻的降深观测值即可计算含水层的贮水系数，仅利用一个观测孔的资料且进行一次直线图解或线性回归计算，就可进行参数计算等优点。

New method for estimating aquifer parameters according to the data of water level recovery in pumping test

A new method for analyzing the data of water level recovery in pumping test is proposed. In order to derive the equations for estimating aquifer parameters, simplifications of the well function are suggested. Two terms in the expansion of well function are taken as the approximation of the well function describing the drawdown caused by imaginary continuing pumping, and the first three terms are taken as the approximation of the well function describing the drawdown caused by imaginary recharging with the same flow rate in pumping stage at the moment of pumping stopping. Based on these simplifications the methods for estimating the transmissibility and storage coefficient of aquifer according to the data of drawdown-time and drawdown-distance are established.