Predicting monthly streamflow using a hybrid wavelet neural network: Case study of the Çoruh river basin


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Güneş M. Ş. , Parim C. , Yıldız D. , Büyüklü A. H.

Polish Journal of Environmental Studies, vol.30, no.4, pp.3065-3075, 2021 (Journal Indexed in SCI Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 4
  • Publication Date: 2021
  • Doi Number: 10.15244/pjoes/130767
  • Title of Journal : Polish Journal of Environmental Studies
  • Page Numbers: pp.3065-3075

Abstract

© 2021, HARD Publishing Company. All rights reserved.In this study, a hybrid model combining discrete wavelet transforms (WTs) and artificial neural networks (ANNs) is used to estimate the monthly streamflow. The WT-ANN hybrid model was developed using the Daubechies main wavelet to predict the streamflow for three gauging stations on the Çoruh river basin one month in advance, with different combinations of air temperature, precipitation, and streamflow variables, and their wavelet transformations. Four different hybrid WT-ANN models were generated and compared with four different conventional ANN models. The dataset was chronologically divided into training, validation, and testing data. The results indicated that the WT-ANN hybrid models performed better than the traditional ANN models for all three stations. Furthermore, the chronologically divided dataset was used to examine the effects of changes in hydrological data over time on model performance. In conclusion, model performances in the training period deteriorated during the validation and testing periods due to structural changes in the hydrological data.