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

2021 ◽  
Author(s):  
Yu Yao ◽  
Xiaoxiao Yang ◽  
Sai Hin Lai ◽  
Ren Jie Chin
Keyword(s):  
Neural Network ◽  
Solitary Wave ◽  
Multi Layer Perceptron ◽  
Fringing Reefs ◽  
Run Up

Modeling solitary wave transformation and run-up over fringing reefs with large bottom roughness

2020 ◽  
Vol 218 ◽  
pp. 108208
Author(s):  
Yu Yao ◽  
Xianjin Chen ◽  
Conghao Xu ◽  
Meijun Jia ◽  
Changbo Jiang
Keyword(s):  
Solitary Wave ◽  
Wave Transformation ◽  
Fringing Reefs ◽  
Run Up

scholarly journals A Study of the Maximum Momentum Flux in the Solitary Wave Run-Up Zone over Back-Reef Slopes Based on a Boussinesq Model

2019 ◽  
Vol 7 (4) ◽  
pp. 109 ◽  
Author(s):  
Liu ◽  
Shao ◽  
Ning
Keyword(s):  
Solitary Wave ◽  
Momentum Flux ◽  
Reef Flat ◽  
Slope Angle ◽  
Shock Capturing ◽  
Wave Transformation ◽  
Back Reef ◽  
Boussinesq Model ◽  
Fringing Reefs ◽  
Run Up

This study utilized a shock-capturing Boussinesq model FUNWAVE-TVD to investigate the maximum momentum flux in the solitary wave run-up zone over back-reef slopes. Validation results of the present model were compared to the previous version of FUNWAVE using the eddy viscosity breaking model to demonstrate the advantages of the shock-capturing method in predicting the breaking solitary wave transformation and run-up over fringing reefs. A series of numerical experiments was designed comprehensively and performed then to obtain a new formulation for the envelope of the spatial distribution of the maximum momentum flux within the solitary wave run-up zone over back-reef beaches, which is different from the one used over uniformly-sloping beaches. Finally, the effects of the variation of reef parameters (i.e., the fore-reef slope angle, reef flat width, and water depth over the reef flat) on the maximum momentum flux at the initial shoreline were investigated to better understand the role of fringing reefs in the mitigation of tsunami hazard.

scholarly journals Large eddy simulation modeling of tsunami-like solitary wave processes over fringing reefs

2019 ◽  
Vol 19 (6) ◽  
pp. 1281-1295 ◽  
Author(s):  
Yu Yao ◽  
Tiancheng He ◽  
Zhengzhi Deng ◽  
Long Chen ◽  
Huiqun Guo
Keyword(s):  
Solitary Wave ◽  
Large Eddy Simulation ◽  
Reef Slope ◽  
Wave Transformation ◽  
Reef Crest ◽  
Primary Concern ◽  
Eddy Simulation ◽  
Fringing Reefs ◽  
Large Eddy ◽  
Run Up

Abstract. Many low-lying tropical and subtropical reef-fringed coasts are vulnerable to inundation during tsunami events. Hence accurate prediction of tsunami wave transformation and run-up over such reefs is a primary concern in the coastal management of hazard mitigation. To overcome the deficiencies of using depth-integrated models in modeling tsunami-like solitary waves interacting with fringing reefs, a three-dimensional (3-D) numerical wave tank based on the computational fluid dynamics (CFD) tool OpenFOAM® is developed in this study. The Navier–Stokes equations for two-phase incompressible flow are solved, using the large eddy simulation (LES) method for turbulence closure and the volume-of-fluid (VOF) method for tracking the free surface. The adopted model is firstly validated by two existing laboratory experiments with various wave conditions and reef configurations. The model is then applied to examine the impacts of varying reef morphologies (fore-reef slope, back-reef slope, lagoon width, reef-crest width) on the solitary wave run-up. The current and vortex evolutions associated with the breaking solitary wave around both the reef crest and the lagoon are also addressed via the numerical simulations.

A study of tsunami-like solitary wave transformation and run-up over fringing reefs

2018 ◽  
Vol 149 ◽  
pp. 142-155 ◽  
Author(s):  
Yu Yao ◽  
Fang He ◽  
Zhengjiang Tang ◽  
Zengsheng Liu
Keyword(s):  
Solitary Wave ◽  
Wave Transformation ◽  
Fringing Reefs ◽  
Run Up

scholarly journals Assessment of Numerical Methods for Plunging Breaking Wave Predictions

2021 ◽  
Vol 9 (3) ◽  
pp. 264
Author(s):  
Shanti Bhushan ◽  
Oumnia El Fajri ◽  
Graham Hubbard ◽  
Bradley Chambers ◽  
Christopher Kees
Keyword(s):  
Solitary Wave ◽  
Wave Breaking ◽  
Large Scale ◽  
Turbulence Models ◽  
Navier Stokes ◽  
Wave Crest ◽  
Breaking Wave ◽  
Rans Turbulence Models ◽  
Run Up ◽  
Better Than

This study evaluates the capability of Navier–Stokes solvers in predicting forward and backward plunging breaking, including assessment of the effect of grid resolution, turbulence model, and VoF, CLSVoF interface models on predictions. For this purpose, 2D simulations are performed for four test cases: dam break, solitary wave run up on a slope, flow over a submerged bump, and solitary wave over a submerged rectangular obstacle. Plunging wave breaking involves high wave crest, plunger formation, and splash up, followed by second plunger, and chaotic water motions. Coarser grids reasonably predict the wave breaking features, but finer grids are required for accurate prediction of the splash up events. However, instabilities are triggered at the air–water interface (primarily for the air flow) on very fine grids, which induces surface peel-off or kinks and roll-up of the plunger tips. Reynolds averaged Navier–Stokes (RANS) turbulence models result in high eddy-viscosity in the air–water region which decays the fluid momentum and adversely affects the predictions. Both VoF and CLSVoF methods predict the large-scale plunging breaking characteristics well; however, they vary in the prediction of the finer details. The CLSVoF solver predicts the splash-up event and secondary plunger better than the VoF solver; however, the latter predicts the plunger shape better than the former for the solitary wave run-up on a slope case.

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