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- W4361807265 abstract "The solution of the governing equation representing the drawdown in a horizontal confined aquifer, where groundwater flow is unsteady, is provided in terms of the exponential integral, which is famously known as the Well function. For the computation of this function in practical applications, it is important to develop not only accurate but also a simple approximation that requires evaluation of the fewest possible terms. To that end, introducing Ramanujan's series expression, this work proposes a full-range approximation to the exponential integral using Ramanujan's series for the small argument (u leq 1) and an approximation based on the bound of the integral for the other range (u in (1,100]). The evaluation of the proposed approximation results in the most accurate formulae compared to the existing studies, which possess the maximum percentage error of 0.05%. Further, the proposed formula is much simpler to apply as it contains just the product of exponential and logarithm functions. To further check the efficiency of the proposed approximation, we consider a practical example for evaluating the discrete pumping kernel, which shows the superiority of this approximation over the others. Finally, the authors hope that the proposed efficient approximation can be useful for groundwater and hydrogeological applications." @default.
- W4361807265 created "2023-04-05" @default.
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- W4361807265 date "2023-03-03" @default.
- W4361807265 modified "2023-09-27" @default.
- W4361807265 title "Full-Range Approximation for the Theis Well Function Using Ramanujan's Series and Bounds for the Exponential Integral" @default.
- W4361807265 doi "https://doi.org/10.48550/arxiv.2303.16871" @default.
- W4361807265 hasPublicationYear "2023" @default.
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