Estimating Hydraulic Parameters of Aquifers Using Type Curve Analysis of Pumping Tests with Piecewise-Constant Rates
نویسندگان
چکیده
Aquifer hydraulic parameters play a critical role in investigating various groundwater hydrology problems (e.g., depletion and transport), the Theis formula for constant-rate pumping tests is commonly used to estimate them. However, rate field usually varies with time due some factors, making classical model unsuitable accurate parameter estimation. To address this issue, we developed novel dimensionless-form analytical solution variable-rate involving piecewise-constant approximations variable rates. Analysis of time–drawdown curves revealed that first-step type curve was consistent curve. subsequent steps deviated from were associated first dimensionless inflection (t1,D), which depended on conductivity (K) specific storage (Ss) confined aquifers. On basis, new method estimating aquifer K Ss proposed by matching observed drawdown data series dependent t1,D. Furthermore, can handle recovery data. We applied site Wuxi City, Jiangsu Province, China, analyzing four tests. The estimated using close agreement those calibrated via PEST. values further validated comparing them lithology-based results. In summary, geometric means 6.62 m/d 3.16 × 10−5 m−1 0.92 2.34 10−4 second aquifer.
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ژورنال
عنوان ژورنال: Water
سال: 2023
ISSN: ['2073-4441']
DOI: https://doi.org/10.3390/w15091661