Prediction of River Discharge and Assessment its Relationship at Consecutive Hydrometric Stations Using GPR-EEMD Combined Techniques (Case Study: Housatonic River)

Document Type : Research Paper

Authors

1 Associated Professor, Department of Water Engineering, Faculty of civil, Tabria Univercity, Tabriz, Iran.

2 M. Sc. Student, Department of water resources engineering, Faculty of civil, Tabria Univercity, Tabriz, Iran.

Abstract

Accurate forecasting of river flow is one of the most important factors in surface water resources management, especially during flood and drought periods. In this research, the wavelet function and the ensemble empirical mode decomposition (EEMD), which are considered as soft computing tools, were used to derive the time series features, and the efficiency of the wavelet- Gaussian and the ensemble empirical mode decomposition-Gaussian models for predicting the discharge between the three consecutive stations located in the Housatonic river have been investigated. For this purpose, in the first step, the discharge of downstream stations is predicted by upstream stations using the Gaussian process regression model. Then, the discharge-stage time series was broken up by wavelet transform and ensemble empirical mode decomposition into cages, and these subclasses were introduced into the Gaussian process regression modeling to simulate the discharge-stage relationship. Also, the effect of each of the sub-series of ensemble empirical mode decomposition model (Residual and IMFs) was studied to improve predictive outcomes. It was observed that the most inefficient subseries in the ensemble empirical mode decomposition model is the residual subseries. The results indicate that wavelet compound techniques (DWT-GPR) and ensemble empirical mode decomposition (EEMD-GPR) have improved the results to a certain extent. As an example, for the test stage, the best prediction model of the second station, the combined model of ensemble empirical mode decomposition-Gaussian upgraded determination coefficient (DC) from 0.74 to 0.80 and the combined model of wavelet-Gaussian upgraded DC from 0.74 to 0.83.

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References

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Iranian Journal of Soil and Water Research
Volume 50, Issue 10
March 2020
Pages 2473-2485

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