University of Guilan Caspian Journal of Environmental Sciences 1735-3033 21 3 2023 07 01 An artificial neural networks approach and hybrid method with wavelet transform to investigate the quality of Tallo River, Indonesia 647 656 6942 10.22124/cjes.2023.6942 EN Dahlan Abdullah Department of Information Technology, University of Malikussaleh, Aceh, Indonesia Kristina Gartsiyanova National Institute of Geophysics, Geodesy and Geography, Hydrology and Water Management Research Center, Bulgarian Academy of Sciences (NIGGG-BAS), Sofia, Bulgaria, Acad. G. Bonchev Str., bl. 3, Sofia 1113, Bulgaria Khurramova (Eshmamatova) Madina Mansur Qizi Faculty of Finance and Accounting, Department of "Financial Analysis and Audit" Tashkent State University of Economics, Tashkent, Uzbekistan, Islom Karimov 49, Tashkent 100066 Eshkobilov Akhmad Javlievich Assistant of Termez Institute of Agrotechnologies and Innovative Development, Termez, Uzbekistan. Yangiabad mahalla, Termez district, Surkhandarya region, 191200, Uzbekistan Mullabayev Baxtiyarjon Bulturbayevich Department of Economics, Namangan Engineering-Construction Institute, Namangan, Republic of Uzbekistan Gavxar Zokirova Department of Finance, Termez State University, Uzbekistan Mohd Norazmi Nordin Centre of Research for Education and Community Wellbeing, Faculty of Education, Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia Journal Article 2023 07 28 Water contamination has always been one of the greatest intense environmental issues. Rivers are more polluted than the other surface and underground water resources, since passing through different areas. The current study aimed to examine the exactitude of artificial neural networks (ANN) and wavelet-ANN (WANN) models in estimating the concentrations of pollutants including Cl, EC, Mg, and TDS by comparing the results of the observed data. Tallo River in Indonesia was selected as the case study. The concentrations of pollutant parameters Cl, EC, Mg, and TDS were available and used between 2010 and 2022. Then 70% (100 months) of the data were considered as training data, while 30% (44 months) were supposed to be the testing ones. ANN and WANN models were examined to evaluate and predict the concentrations of pollutants in river water. The results of each model were compared to the observed data, and the models' accuracy was assessed. The results demonstrated that applying wavelet transform improved the precision of simulation. All efficiency criteria associated with the WANN model yielded superior results compared to the ANN model. The findings indicated that using the hybrid method with wavelet transformation ameliorated the ANN model's exactitude by 10% during training and 16% during testing. Finally, the findings exhibited that the WANN method is better than ANN; consequently, the former has performed more exactitude modeling in the estimation of water quality. https://cjes.guilan.ac.ir/article_6942_000631d6e5351793db77ca9cc52f10e7.pdf