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Predicting tsunami-like solitary wave run-up over fringing reefs using the multi-layer perceptron neural network

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Abstract

Modeling of tsunami wave interaction with coral reefs to date focuses mainly on the process-based numerical models. In this study, an alternative machine learning technique based on the multi-layer perceptron neural network (MLP-NN) is introduced to predict the tsunami-like solitary wave run-up over fringing reefs. Two hydrodynamic forcings (incident wave height, reef-flat water level) and four reef morphologic features (reef width, fore-reef slope, beach slope, reef roughness) are selected as the input variables and wave run-up on the back-reef beach is assigned as the output variable. A validated numerical model based on the Boussinesq equations is applied to provide a dataset consisting of 4096 runs for MLP-NN training and testing. Results analyses show that the MLP-NN consisting of one hidden layer with ten hidden neurons provides the best predictions for the wave run-up. Subsequently, model performances in view of individual input variables are accessed via an analysis of the percentage errors of the predictions. Finally, a mean impact value analysis is also conducted to evaluate the relative importance of the input variables to the output variable. In general, the adopted MLP-NN has high predictive capability for wave run-up over the reef-lined coasts, and it is an alternative but more efficient tool for potential use in tsunami early warning system or risk assessment projects.

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Acknowledgements

This study was supported financially by the National Natural Science Foundation of China (Grant Nos. 51979013 and 51679014), the Scientific Research Fund of Hunan Provincial Education Department, China (Grant No. 18A116).

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Correspondence to Yu Yao.

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The authors declare that they have no conflict of interest.

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The raw simulated data used in this study are available upon request (yaoyu821101@163.com).

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Yao, Y., Yang, X., Lai, S.H. et al. Predicting tsunami-like solitary wave run-up over fringing reefs using the multi-layer perceptron neural network. Nat Hazards 107, 601–616 (2021). https://doi.org/10.1007/s11069-021-04597-w

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  • DOI: https://doi.org/10.1007/s11069-021-04597-w

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