Using statistical and artificial neural network models to forecast potentiometric levels at a deep well in South Texas |
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Authors: | V Uddameri |
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Institution: | (1) MSC 213 Department of Environmental Engineering, Texas A&M University-Kingsville, Kingsville, TX 78363, USA |
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Abstract: | Reliable forecasts of monthly and quarterly fluctuations in groundwater levels are necessary for short- and medium-term planning
and management of aquifers to ensure proper service of seasonal demands within a region. Development of physically based transient
mathematical models at this time scale poses considerable challenges due to lack of suitable data and other uncertainties.
Artificial neural networks (ANN) possess flexible mathematical structures and are capable of mapping highly nonlinear relationships.
Feed-forward neural network models were constructed and trained using the back-percolation algorithm to forecast monthly and
quarterly time-series water levels at a well that taps into the deeper Evangeline formation of the Gulf Coast aquifer in Victoria,
TX. Unlike unconfined formations, no causal relationships exist between water levels and hydro-meteorological variables measured
near the vicinity of the well. As such, an endogenous forecasting model using dummy variables to capture short-term seasonal
fluctuations and longer-term (decadal) trends was constructed. The root mean square error, mean absolute deviation and correlation
coefficient (R) were noted to be 1.40, 0.33 and 0.77 m, respectively, for an evaluation dataset of quarterly measurements and 1.17, 0.46,
and 0.88 m for an evaluative monthly dataset not used to train or test the model. These statistics were better for the ANN
model than those developed using statistical regression techniques. |
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Keywords: | ANN Back percolation Time-series modeling Coastal aquifers Texas USA |
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