稳定流抽水试验求解越流参数的新方法

A new method for estimating leaky aquifer parameters with steady pumping tests

利用稳定流抽水试验资料求解越流补给条件下水文地质参数为涉及2个未知数的超越方程,常规的解析法无法直接获解。而目前工程上采用的图解法及试算法或是误差大,或是依赖图表、计算繁复。本文采用优化拟合方法,在工程适应参数范围内,用较为简单的函数实现了对由图表给出的越流补给条件下虚宗量零阶第二类修正贝塞尔函数的替代,并利用水位降深比值关系,经整理获得了可直接完成参数求解的计算式,计算过程简捷,不依赖图表,便于实际工程应用。

Due to the transcendental equation using steady flow pumping test data to solve the hydrogeological parameter under the leakage recharge conditions involving two uncertain factors,the conventional analytic method cannot solve the problem directly. The graphic method and the trial method currently used in practice are always with great discrepancy or with great workload. Adopting optimized fitting method,using a relatively simple function to substitute the zero order second kind modified Bessel functions obtained from the flow chart under the recharging condition, based on drawdown ratio relationship,the solution which could calculate the parameters directly is obtained. The calculation process without relying on chart is simple and convenient for practical application.