Quick Estimation of Tsunami Induced Runup on Coastal Area

Lin, Jiang‐Jen; Cheng, Chia Yan; Yu, Jin; Chen, Yang Yih; Chen, Guan Yu

doi:10.9753/icce.v34.currents.8

Cited by 3 publications

(5 citation statements)

References 9 publications

(21 reference statements)

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“…While in this study the two combined effects of shoaling and refraction are considered, there are phenomena associated with wave behavior that play a role in run-ups are not yet incorporated, including effects of reflection and dispersion, and energy dissipation. Other external parameters, such as the geometry of the coast, coastal topography, and nearshore bathymetry may influence run-up parameterization, as claimed by some previous work on run-up and inundation estimation (Hayashi, 2010;Mori et al, 2011;Chen et al, 2012;Goto et al, 2013;Lin et al, 2014). For now, this study does not consider these effects as it concerns only on a simple parameterization for tsunami run-up prediction and therefore the incorporation of more local effects into the run-up estimate is challenging for future work.…”

Section: Resultsmentioning

confidence: 97%

“…(2). The calculated results are hereby compared to field data from observational studies available at http://www.ngdc.noaa.gov and direct surveys (Mori et al, 2011;Goto et al, 2013), and also to relevant data developed from numerical codes (Hirata et al, 2004;Lin et al, 2014). Detailed data and the calculated run-ups using Eq.…”

Section: Resultsmentioning

confidence: 99%

“…The aim of this study is therefore to test and determine the applicability of the Green's law for tsunami run-up estimates using water depths as local parameters and orthogonal spacing widths of two adjacent refracted wave rays in the normal direction of wave fronts. In short, we include effect of wave refraction with no loss of energy in the basic Green's law for run-up prediction and then examine how close the results derived from the modified Green's law compared to run-ups obtained from simulations (Hirata et al, 2004;Lin et al, 2014) and field surveys (Goto et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The run-up data records may thus be used as an effective indicator of local impacts of the event on coastal regions (Charvet et al, 2013), prompting the necessity of quick and accurate prediction of run-up heights for tsunami early warning (Chen et al, 2012;Lin et al, 2014). In line with this need, the present work in part focuses on providing physical grounds on the problem in question where conservation of energy density flux, neglecting energy dissipation due to seabed friction and other mechanisms (WMO, 1998;Hayashi, 2010;Fuchs, 2013), is then used to derive a simple formula for tsunami run-up parameterization.…”

Section: Introductionmentioning

confidence: 99%

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A simple parameterization for tsunami run-up prediction

Cholifah

Prastowo

2017

JoSSE

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The linear shallow-water approximation is commonly used to describe tsunami propagation, where the wave is assumed as a long surface gravity wave. The evolution of wave height during its propagation from offshore to onshore is a classic problem. When arriving at a shoreline, the increased wave height causes severe destruction on infrastructures and fatalities. This problem has then been an important issue within the context of disaster risk reduction as it gives rise to the importance of tsunami run-up prediction. Using maximum run-up data from past events, we tested the applicability of the Green's law based on shoaling only to calculate run-ups and found that the basic Green's law was in doubt. Then, we examined energy density conservation involving refraction effect but no dissipation and derived a simple formula for parameterizing run-up height. Detailed descriptions on factors affecting run-ups, such as complex bathymetry and topography are not yet considered in the current study. The aim of this study is therefore to determine whether the modified Green's law is applicable for tsunami run-up prediction using local water depths as external parameters and ray spacing widths in the normal direction of wave fronts related to refraction. The results are consistent with the measured run-ups, where approximately 70% of total points of observations confirm the modified Green's law with a reasonable accuracy.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A simple parameterization for tsunami run-up prediction

Cholifah

Prastowo

2017

JoSSE

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“…(47) to compute the response much faster than inverse Fourier transforming the boundary element results. The operational fast Fourier transform-based models that use buoy data for tsunami warning (such as Lin et al, 2014) can not assimilate the buoy data continuously as it comes; they instead use the time series after a substantial part of the tsunami has passed across the buoy and then input this time series as the wave forcing to calculate run-up. This computational economisation has two advantages; the first is that these contour integrals can be pre-calculated and stored before, so during an operational emergency the only data that is needed is the wave train, and the response can be calculated very fast (the last integral in Eq.…”

Section: Discussionmentioning

confidence: 99%

On the resonance hypothesis of storm surge and surf beat run-up

Postacıoğlu¹,

Özeren²,

Canlı³

2017

Nat. Hazards Earth Syst. Sci.

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Abstract. Resonance has recently been proposed as the fundamental underlying mechanism that shapes the amplification in coastal run-up for storm surges and surf beats, which are long-wavelength disturbances created by fluid velocity differences between the wave groups and the regions outside the wave groups. It is without doubt that the resonance plays a role in run-up phenomena of various kinds; however, we think that the extent to which it plays its role has not been completely understood. For incident waves, which we assume to be linear, the best approach to investigate the role played by the resonance would be to calculate the normal modes by taking radiation damping into account and then testing how those modes are excited by the incident waves. Such modes diverge offshore, but they can still be used to calculate the run-up. There are a small number of previous works that attempt to calculate the resonant frequencies, but they do not relate the amplitudes of the normal modes to those of the incident wave. This is because, by not including radiation damping, they automatically induce a resonance that leads to infinite amplitudes, thus preventing them from predicting the exact contribution of the resonance to coastal run-up. In this study we consider two different coastal geometries: an infinitely wide beach with a constant slope connecting to a flat-bottomed deep ocean and a bay with sloping bottom, again, connected to a deep ocean. For the fully 1-D problem we find significant resonance if the bathymetric discontinuity is large.The linearisation of the seaward boundary condition leads to slightly smaller run-ups. For the 2-D ocean case the analysis shows that the wave confinement is very effective when the bay is narrow. The bay aspect ratio is the determining factor for the radiation damping. One reason why we include a bathymetric discontinuity is to mimic some natural settings where bays and gulfs may lead to abrupt depth gradients such as the Tokyo Bay. The other reason is, as mentioned above, to test the role played by the depth discontinuity for resonance.

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