Laboratory study on effects of submerged obstacles on tsunami wave and run-up

Touhami, Houssam Eddine; Khellaf, Mohamed Cherif

doi:10.1007/s11069-017-2791-9

Cited by 7 publications

(3 citation statements)

References 42 publications

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“…These great threats demonstrate the need to mitigate tsunamis by using artificial obstacles including wave-dissipating blocks, rock breakwaters, and large embankments. Recent studies investigated tsunami waves in both laboratory experiments [5][6][7][8] and field investigations [9,10] with the ultimate goal of mitigating their impacts and reducing natural disasters in coastal regions. Considering the advantages of flexibility and repeatability in numerical models, many numerical simulations have been carried out using different models to investigate the run-up heights and velocity processes of tsunamis [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations of Tsunami Run-Up and Flow Structure on Coastal Vegetated Beaches

Zhang

et al. 2018

Water

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Tsunami waves become hazardous when they reach the coast. In South and Southeast Asian countries, coastal forest is widely utilized as a natural approach to mitigate tsunami damage. In this study, a depth-integrated numerical model was established to simulate wave propagation in a coastal region with and without forest cover. This numerical model was based on a finite volume Roe-type scheme, and was developed to solve the governing equations with the option of treating either a wet or dry wave front boundary. The governing equations were modified by adding a drag force term caused by vegetation. First, the model was validated for the case of solitary wave (breaking and non-breaking) run-up and run-down on a sloping beach, and long periodic wave propagation was investigated on a partially vegetated beach. The simulated results agree well with the measured data. Further, tsunami wave propagation on an actual-scale slope covered by coastal forest Pandanus odoratissimus (P. odoratissimus) and Casuarina equisetifolia (C. equisetifolia) was simulated to elucidate the influence of vegetation on tsunami mitigation with a different forest open gap. The numerical results revealed that coastal vegetation on sloping beach has significant potential to mitigate the impacts from tsunami waves by acting as a buffer zone. Coastal vegetation with open gaps causes the peak flow velocity at the exit of the gap to increase, and reduces the peak flow velocity behind the forest. Compared to a forest with open gaps in a linear arrangement, specific arrangements of gaps in the forest can increase the energy attenuation from tsunami wave. The results also showed that different cost-effective natural strategies in varying forest parameters including vegetation collocations, densities, and growth stages had significant impacts in reducing the severity of tsunami damage.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigations of Tsunami Run-Up and Flow Structure on Coastal Vegetated Beaches

Zhang

et al. 2018

Water

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“…Its importance is also confirmed by a number of scientific papers (see recent works, e.g. Tang et al, 2017;Touhami and Khellaf, 2017;Zainali et al, 2017;Raz et al, 2018;Yao et al, 2018).…”

Section: Introductionmentioning

confidence: 72%

Nonlinear deformation and run-up of single tsunami waves of positive polarity: numerical simulations and analytical predictions

Abdalazeez

Didenkulova

Dutykh

2019

Nat. Hazards Earth Syst. Sci.

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Abstract. The estimate of an individual wave run-up is especially important for tsunami warning and risk assessment, as it allows for evaluating the inundation area. Here, as a model of tsunamis, we use the long single wave of positive polarity. The period of such a wave is rather long, which makes it different from the famous Korteweg–de Vries soliton. This wave nonlinearly deforms during its propagation in the ocean, which results in a steep wave front formation. Situations in which waves approach the coast with a steep front are often observed during large tsunamis, e.g. the 2004 Indian Ocean and 2011 Tohoku tsunamis. Here we study the nonlinear deformation and run-up of long single waves of positive polarity in the conjoined water basin, which consists of the constant depth section and a plane beach. The work is performed numerically and analytically in the framework of the nonlinear shallow-water theory. Analytically, wave propagation along the constant depth section and its run up on a beach are considered independently without taking into account wave interaction with the toe of the bottom slope. The propagation along the bottom of constant depth is described by the Riemann wave, while the wave run-up on a plane beach is calculated using rigorous analytical solutions of the nonlinear shallow-water theory following the Carrier–Greenspan approach. Numerically, we use the finite-volume method with the second-order UNO2 reconstruction in space and the third-order Runge–Kutta scheme with locally adaptive time steps. During wave propagation along the constant depth section, the wave becomes asymmetric with a steep wave front. It is shown that the maximum run-up height depends on the front steepness of the incoming wave approaching the toe of the bottom slope. The corresponding formula for maximum run-up height, which takes into account the wave front steepness, is proposed.

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“…Its importance is also confirmed by a number of scientific papers, e.g. see recent works (Tang et al 2017;Touhami and Khellaf 2017;Zainali et al 2017;Raz et al 2018;Yao et al 2018).…”

Section: Introductionmentioning

confidence: 73%

Nonlinear deformation and run-up of single tsunami waves of positive polarity: numerical simulations and analytical predictions

Abdalazeez¹,

Didenkulova²,

Dutykh³

2019

Preprint

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The estimate of individual wave run-up is especially important for tsunami warning and risk assessment as it allows to evaluate the inundation area. Here as a model of tsunami we use the long single wave of positive polarity. The period of such wave is rather long which makes it different from the famous Korteweg-de Vries soliton. This wave nonlinearly deforms during its propagation in the ocean, what results in a steep wave front formation. Situations, when waves approach the coast with a steep front are often observed during large tsunamis, e.g. 2004 Indian Ocean and 2011 Tohoku tsunamis. Here we study the nonlinear deformation and run-up of long single waves of positive polarity in the conjoined water basin, which consists of the constant depth section and a plane beach. The work is performed numerically and analytically in the framework of the nonlinear shallow water theory. Analytically, wave propagation along the constant depth section and its run-up on a beach are considered independently without taking into account wave interaction with the toe of the bottom slope. The propagation along the bottom of constant depth is described by Riemann wave, while the waverun-up on a plane beach is calculated using rigorous analytical solutions of the nonlinear shallow water theory following the Carrier-Greenspan approach. Numerically, we use the finite volume method with the second order UNO2 reconstruction in space and the third order Runge-Kutta scheme with locally adaptive time steps. During wave propagation along the constant depth section, the wave becomes asymmetric with a steep wave front. Shown, that the maximum run-up height depends on the front steepness of the incoming wave approaching the toe of the bottom slope. The corresponding formula for maximum run-up height, which takes into account the wave front steepness, is proposed.

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Laboratory study on effects of submerged obstacles on tsunami wave and run-up

Cited by 7 publications

References 42 publications

Numerical Investigations of Tsunami Run-Up and Flow Structure on Coastal Vegetated Beaches

Numerical Investigations of Tsunami Run-Up and Flow Structure on Coastal Vegetated Beaches

Nonlinear deformation and run-up of single tsunami waves of positive polarity: numerical simulations and analytical predictions

Nonlinear deformation and run-up of single tsunami waves of positive polarity: numerical simulations and analytical predictions

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