Prediction of daily precipitation using wavelet-neural networks

Partal T., Cigizoglu H. K.

Hydrological Sciences Journal, vol.54, no.2, pp.234-246, 2009 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1623/hysj.54.2.234
  • Journal Name: Hydrological Sciences Journal
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.234-246
  • Keywords: Artificial neural networks, Estimation, Precipitation, Turkey, Wavelet transforms
  • Ondokuz Mayıs University Affiliated: No

Abstract

This study aims to predict the daily precipitation from meteorological data from Turkey using the wavelet - neural network method, which combines two methods: discrete wavelet transform (DWT) and artificial neural networks (ANN). The wavelet - ANN model provides a good fit with the observed data, in particular for zero precipitation in the summer months, and for the peaks in the testing period. The results indicate that wavelet - ANN model estimations are significantly superior to those obtained by either a conventional ANN model or a multi linear regression model. In particular, the improvement provided by the new approach in estimating the peak values had a noticeably high positive effect on the performance evaluation criteria. Inclusion of the summed sub-series in the ANN input layer brings a new perspective to the discussions related to the physics involved in the ANN structure. Copyright © 2009 IAHS Press.