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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。
The steady-stream pumping test data is used to solve the hydrogeological parameters under the condition of over-flow recharge, which is the transcendental equation involving two unknowns. The conventional analytical method can not be directly solved. At present, the graphical method used in engineering and test algorithm or error, or rely on the chart, calculate complex. In this paper, the optimal fitting method is used to replace the second-order modified Bessel function of imaginary-zygosity and zero order under the condition of over-run supply with the simple function in the range of engineering adaptation parameters. The relationship between the water depth and the ratio of the drawdown is obtained, and the formula for solving the parameter can be obtained directly after finishing. The calculating process is simple and convenient, and does not depend on the chart, which is convenient for the practical engineering application.