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Estimation of Unconfined Aquifer Transmissivity Using a Comparative Study of Machine Learning Models

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Abstract

Groundwater management is key to attaining sustainable development goals, especially in arid and semi-arid countries. Hence, a precise estimate of the aquifer hydrodynamic parameters (hydraulic conductivity, transmissivity, specific yield, and storage coefficient) is required for proper groundwater resource management. The central goal of this research is to utilize machine learning models to estimate transmissivity by pumping test data in unconfined alluvial aquifers. Artificial neural network (ANN), gene expression programming (GEP), adaptive neuro-fuzzy inference system (ANFIS), fuzzy logic (FL), least square support vector machine (LSSVM), and group method of data handling (GMDH) methods were utilized to estimate transmissivity. To achieve this goal, pumping tests and hydrogeological data from 96 pumping wells located in the central plateau of Iran were collected and normalized. Using the existing normalized data, several combinations were utilized as inputs to the models, and then randomly, 70% of the data were used for the training step and 30% for the testing step. Finally, ten combinations that provided a better answer were selected from whole combinations. The mean absolute error, root means square error and correlation coefficient were used to assess the models' precision. The comparison criteria revealed that while all developed methods could provide desirable transmissivity estimations, the GMDH model was the most accurate and precise. The result of the models suggested that the best combination in transmissivity estimating was combination 3 (well discharge, thickness, depth of pumping well, and minimum and maximum time-drawdown data). Therefore, using this method and without graphic methods, it is feasible to estimate the transmissivity with acceptable accuracy in unconfined aquifers with similar hydrogeological and geological characteristics.

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Availability of Data and Materials

The data, models, and codes generated or used during the study are available from the corresponding author by request.

Abbreviations

ACO:

Ant Colony Optimization

AI:

Artificial Intelligence

ANFIS:

Adaptive Neuro-Fuzzy Inference System

ANN:

Artificial Neural Network

CSA:

Crow Search Algorithm

DE:

Differential Evolution

FL:

Fuzzy Logic

GA:

Genetic Algorithm

GEP:

Gene Expression Programming

GMDH:

Group Method of Data Handling

HP:

Hydrodynamic Parameter

LM:

Levenberg–Marquardt

LSSVM:

Least Square Support Vector Machine

MAE:

Mean Absolute Error

MF:

Membership Functions

ML:

Machine Learning

MSE:

Means Squared Error

PSO:

Particle Swarm Optimization

R:

Correlation Coefficient

RMSE:

Root Means Squared Error

T:

Transmissivity

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Acknowledgements

Iran Water Resources Management Company issued the data used in this research. The authors thank Iran Water Resources Management Company for providing the pumping test data.

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Contributions

Z. Dashti and M. Vadiati analyzed and interpreted data and contributed to writing the manuscript. M. Nakhaei and G.H. Karami contributed to the interpretation and manuscript revision. O. Kisi was involved in revising the manuscript critically for important intellectual content. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Meysam Vadiati.

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Dashti, Z., Nakhaei, M., Vadiati, M. et al. Estimation of Unconfined Aquifer Transmissivity Using a Comparative Study of Machine Learning Models. Water Resour Manage 37, 4909–4931 (2023). https://doi.org/10.1007/s11269-023-03588-9

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  • DOI: https://doi.org/10.1007/s11269-023-03588-9

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