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A Type‐Curve Method for the Analysis of Pumping Tests with Piecewise‐Linear Pumping Rates
Ground Water ( IF 2.6 ) Pub Date : 2020-02-12 , DOI: 10.1111/gwat.12981
Chao Zhuang , Yabing Li 1 , Zhifang Zhou 1 , Walter A. Illman 2 , Zhi Dou 1 , Jinguo Wang 1 , Long Yan 1
Affiliation  

Aquifer hydraulic parameters are commonly inferred from constant‐rate pumping tests, while variable pumping rates are frequently encountered in actual field conditions. In this study, we propose a generally applicable dimensionless form of the analytical solution for variable‐rate pumping tests in confined aquifers. In particular, we adopt a piecewise‐linear fitting of variable pumping rates and propose a new type‐curve method for estimating the hydraulic conductivity (K) and specific storage (Ss) of the investigated confined aquifer. For each test, a series of type curves, which depend on the variable pumping rates, the location of observation wells and the introduced first dimensionless inflection time, need to be provided for matching the observed drawdown data on a log‐log graph. We first demonstrate the applicability and robustness of this method through a synthetic pumping test. Subsequently, we apply this method to analyze drawdown data from four pumping tests conducted within a multilayered aquifer/aquitard system in Wuxi city, Jiangsu Province, China. The parameter estimates are then compared with those reported by PEST. The K and Ss values estimated by the new type‐curve method are found to be quite close to PEST‐based estimates. Parameter estimation results demonstrate the difference in K and Ss values between observation wells. The difference could be attributed to the spatial heterogeneity in K and Ss. A future research topic may focus on the characterization of K and Ss heterogeneity with the currently available drawdown data from variable‐rate pumping tests.

中文翻译:

分段线性抽水率抽水试验的类型曲线方法

含水层水力参数通常是从恒速泵送测试中推导出来的,而在实际现场条件下经常会遇到可变的泵送速率。在这项研究中,我们提出了一种普遍适用的无量纲形式的分析解决方案,用于受限含水层中的可变速率抽水试验。特别是,我们采用可变抽油量的分段线性拟合,并提出了一种新的曲线方法来估算水力传导率(K)和比存储(S s)的受限承压含水层。对于每项测试,都需要提供一系列类型曲线,这些曲线取决于变量泵送速率,观察井的位置以及引入的第一个无量纲拐点时间,以匹配对数-对数图上观察到的下降数据。我们首先通过合成泵测试证明了该方法的适用性和鲁棒性。随后,我们使用这种方法来分析来自江苏省无锡市多层含水层/阿奎塔尔系统中进行的四个抽水试验的水位下降数据。然后将参数估计值与PEST报告的估计值进行比较。该ķ小号小号通过新的类型曲线方法估算出的值与基于PEST的估算值非常接近。参数估计结果表明,观察井之间的KS s值存在差异。差异可以归因于KS中空间异质性。未来的研究主题可能会集中在利用可变速率泵浦测试的当前可用回撤数据来表征KS异质性。
更新日期:2020-02-12
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