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Knowledge extraction from trained neural network scour model at culvert outlets

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Abstract

Artificial neural networks (ANNs), due to their outstanding capabilities for modeling complex processes, have been successfully applied to a variety of problems in hydraulics. However, one of the major criticisms of ANNs is that they are just black-box models, since a satisfactory explanation of their behavior has not been offered. They, in particular, do not explain easily how the inputs are related to the output and also whether the selected inputs have any significant relationship with an output. In this paper, a perturbation analysis for determining the order of influence of the elements in the input vector on the output vector is discussed. The analyses of the results suggest that each variable in the input vector (d 50/d 0, F 0, H/d 0, σg, and W 0/d 0) influences the depth of scour in different ways. However, the magnitude of the influence cannot be clearly quantified by this approach. Further it adds that the selection of input vector based on linear measures between the variables of interest, which is commonly employed, may still include certain spurious elements that only increase the model complexity.

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Acknowledgments

The authors gratefully acknowledge the financial support from the International Foundation for Science (IFS) and Organisation for the Prohibition of Chemical Weapons (OPCW) as research grant (Grant no. W/5073-1). Authors also express their sincere gratitude to Universiti Sains Malaysia (USM) and Ministry of Higher Education (MOHE), Malaysia for allowing necessary financial support through research grants (USM Short Term Grant, Code no P3665; and Explanatory Research Grant Scheme-ERGS, code no. X0043).

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Authors and Affiliations

  1. River Engineering and Urban Drainage Research Centre (REDAC), Universiti Sains Malaysia, Engineering Campus, 14300, Nibong Tebal, Pulau Pinang, Malaysia

    H. Md. Azamathulla

  2. School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300, Nibong Tebal, Pulau Pinang, Malaysia

    A. A. M. Haque

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  1. H. Md. Azamathulla
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Correspondence to H. Md. Azamathulla.

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Azamathulla, H.M., Haque, A.A.M. Knowledge extraction from trained neural network scour model at culvert outlets. Neural Comput & Applic 23, 2137–2141 (2013). https://doi.org/10.1007/s00521-012-1164-2

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  • DOI: https://doi.org/10.1007/s00521-012-1164-2

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