Bridge backwater estimation: A comparison between artificial intelligence models and explicit equations

Document Type : Article

Authors

1 School of Engineering, Department of Civil and Environmental Engineering, Shiraz University, Zand Blvd., Shiraz, Iran

2 School of Engineering, Department of Civil and Environmental Engineering, Shiraz University, Zand Blvd., Shiraz, Iran.

Abstract

Estimation of bridge backwater has been one of practical challenges in hydraulic engineering for decades. In this study, Genetic Programming (GP) has been applied for estimating bridge backwater for the first time based on the conducted literature review. Furthermore, two new explicit equations are developed for predicting bridge afflux using Genetic Algorithm (GA) and hybrid MHBMO-GRG algorithm. The performances of these models are compared with Artificial Neural Network (ANN) and several explicit equations available in the literature considering both laboratory and field data. Based on five considered performance evaluation criteria, the two new explicit equations outperform the ones available in the literature. Furthermore, GP and ANN achieve the best results in favor of four out of five considered criteria for train and test data, respectively. To be more specific, ANN improves the MSE and R2 values of the explicit equation developed using GA by 44% and 12% for the test data while GP enhances the corresponding values by 62% and 9% for the train data. Finally, the results demonstrate that not only artificial intelligence models considerably improve bridge afflux estimation than the explicit equations but also the suggested equations significantly improve the accuracy of the available explicit ones.

Keywords

References

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Scientia Iranica
Volume 28, Issue 2
Transactions on Civil Engineering (A)
March and April 2021
Pages 573-585

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History

  • Receive Date: 17 July 2018
  • Revise Date: 19 September 2019
  • Accept Date: 10 February 2020

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