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Hybrid Kernel Extreme Learning Machine-Based Empirical Wavelet Transform for Water Quality Prediction Using Only River Flow as Predictor

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Climate Change Impacts on Natural Resources, Ecosystems and Agricultural Systems

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Abstract

During the last few years, monitoring and controlling water quality in freshwater ecosystems was strongly facilitated by the increasing number of in situ stations, certainly in combination with the high number of developed models. Several water quality variables have received a great deal of attention regarding their environmental importance, while other variables have rarely been studied in detail using modeling strategies. Generally speaking, water variables were linked to building robust models and rarely are the models using fewer variables. Machine learning algorithm aiming to accurately build relationships between water quality variables are widely used and acknowledged. In the present investigation, we tried to introduce a new modeling strategy for predicting two water quality variables: water pH and specific conductance (SC) using kernel extreme learning machine models (KELM). The major contribution of our study is that we used only the river flow as relevant predictor and a single-input and single-output (SISO) model was proposed for predicting water pH and SC. Two scenarios were analyzed and compared. First, SISO models were developed and compared. Second, to greatly increase the performances of the KELM models, we have used the empirical wavelet transform (EWT) algorithm for decomposing the river flow time series into several multiresolution analysis components (MRA), which were used as new input variables. Data collected at the USG websites were used to test the proposed algorithms, and we find that the EWT clearly exhibited high accuracies compared with the SISO models, and it provides a very robust estimate of the water pH and SC. For water pH, it was found that the KELM models based on EWT were more accurate compared with the models without EWT, exhibiting R, NSE, RMSE, and MAE values ranging from 0.888 to 0.981, from 0.767 to 0.961, from 0.038 to 0.074, and from 0.027 to 0.058, respectively. In addition, for the SC, it was found that KELM models based on EWT were more accurate exhibiting R, NSE, RMSE, and MAE values ranging from 0.897 to 0.974, from 0.804 to 0.947, from 2.352 to 5.374, and from 1.528 to 4.152, respectively.

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Acknowledgments

This study could not have been possible without the support of the USGS data survey. The author thanks the staffs of USGS web server for providing the data that makes this research possible.

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Heddam, S. (2023). Hybrid Kernel Extreme Learning Machine-Based Empirical Wavelet Transform for Water Quality Prediction Using Only River Flow as Predictor. In: Pande, C.B., Moharir, K.N., Singh, S.K., Pham, Q.B., Elbeltagi, A. (eds) Climate Change Impacts on Natural Resources, Ecosystems and Agricultural Systems. Springer Climate. Springer, Cham. https://doi.org/10.1007/978-3-031-19059-9_16

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