On the weak impact of the 26 December Indian Ocean tsunami on the Bangladesh coast

Ioualalen, Mansour; Pelinovsky, Efim; Asavanant, Jack; Lipikorn, R.; Deschamps, A.

doi:10.5194/nhess-7-141-2007

Cited by 35 publications

(23 citation statements)

References 10 publications

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“…It can be observed that the island's most important effect is a delay in the arrival time, and an enhancement on wave direction change due to wave diffraction. In contrast to what was concluded by Jinadasa (2008) in Sri Lanka and Ioualalen et al (2007) in Bangladesh, the Biobio submarine canyon seems to be a tsunami natural barrier for the river mouth. They observed that submarine canyons could amplify tsunami wave amplitudes and increase inundation heights.…”

Section: Resultscontrasting

confidence: 83%

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The Effect of a Submarine Canyon on Tsunami Propagation in the Gulf of Arauco, Chile

Aránguiz

2012

Int. Conf. Coastal. Eng.

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The 2010 Chile tsunami affected the entire coast of the Biobio Region, where several bays were flooded, and seawater surged hundreds of meters into rivers. However, no inundation occurred in the 2km wide Biobio River, located at the northern entrance of the Gulf of Arauco. Likewise, minimal inundation (less than 2m) was found on the gulf’s eastern coast, just south of the river mouth. The study was done by means of numerical simulation with TUNAMI code. Four (4) nested grids with 81”, 27”, 9” and 3” resolution were defined. Several scenarios were simulated, including the 1730, 1835, 1960 and 2010 events. The first two scenarios considered only a uniform rupture zone, while the others were defined using non-uniform initial condition. Another set of simulations were run without the presence of the island and with a modified bathymetry, so that its effect on tsunami propagation could be studied. It can be concluded that the Biobio canyon is very important in tsunami propagation in the Gulf of Arauco. There is a mitigation effect on the eastern side of the Gulf due to the refraction and dispersion generated by its presence. The change in wave direction is enhanced due to wave diffraction generated by the Santa María Island, causing the wave fronts to move in a north-south direction, preventing severe damage to the eastern side. However a direct impact of the tsunami in the southern end of the Gulf can be observed.

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Section: Resultscontrasting

confidence: 83%

“…Furthermore, the effect of submarine canyons has been studied by Jinadasa (2008) and Ioualalen et al (2007), who analyzed the effect of the 2004 tsunami in Sri Lanka and Bangladeshi Coasts, respectively. They found an amplification of the wave amplitude due to the presence of the submarine canyons.…”

Section: Coastal Engineering 2012mentioning

confidence: 99%

The Effect of a Submarine Canyon on Tsunami Propagation in the Gulf of Arauco, Chile

Aránguiz

2012

Int. Conf. Coastal. Eng.

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“…Significant wave amplification also occurs along underwater canyons, like it was during the 2004 tsunami in the Indian Ocean (Ioualalen et al, 2007). In contrast to open and wide bays, the wave dynamics in such narrow geometries (the water depth and the bay width are much smaller than the wave length) has many specific features.…”

Section: Introductionmentioning

confidence: 99%

Runup of Tsunami Waves in U-Shaped Bays

Didenkulova

Pelinovsky

2010

Pure Appl. Geophys.

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The problem of tsunami wave shoaling and runup in U-shaped bays (such as fjords) and underwater canyons is studied in the framework of shallow water theory. The wave shoaling in bays, when the depth varies smoothly along the channel axis, is studied with the use of asymptotic approach. In this case a weak reflection provides significant shoaling effects. The existence of traveling (progressive) waves, propagating in bays, when the water depth changes significantly along the channel axis, is studied. It is shown that traveling waves do exist for certain bay bathymetry configurations and may propagate over large distances without reflection.The tsunami runup in such bays is significantly larger than for a plane beach.

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“…Such situations were observed, for instance, during the recent catastrophic tsunami at the Samoan Islands in 2009 [1,2] and in Japan in 2011 [3]. Significant wave intensification also occurs along the submarine canyons, and this was pointed out during the Indian Ocean tsunami in 2004 [4].…”

Section: Introductionmentioning

confidence: 99%

Wave Dynamics in the Channels of Variable Cross-Section

Pelinovsky¹,

Didenkulova²,

Shurgalina³

2017

PhO

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Dynamics of long sea waves in the channels of variable depth and variable rectangular cross-section is discussed within various approximations -from the shallow water equations to those of nonlinear dispersion theory. General approach permitting to find traveling (non-reflective) waves in inhomogeneous channels is demonstrated within the framework of the shallow water linear theory. The appropriate conditions are determined by solving a system of ordinary differential equations. The so-called self-consistent channel in which the width is connected with its depth in a specific way is studied in detail. Within the linear theory of shallow water, a wave does not reflect from the bottom irregularities. The wave shape remains unchanged on the records of the wave gauges (mareographs) fixed along the channel axis, but it varies in space. Nonlinearity and dispersion lead to the wave transformation in such a channel. Within the framework of the shallow water weakly nonlinear theory, the wave shape is described by the Riemann solution, and the wave breaks (gradient catastrophe) quicker in the zones of decreasing depth. The modified Korteweg -de Vries equation describing evolution of a solitary wave of weak but finite amplitude in a self-consistent channel, the depth of which can vary arbitrary, is derived. Some examples of a solitary wave transformation in such a channel are analyzed (particularly, a soliton adiabatic transformation in the channel with the slowly varying parameters, and a solitary wave fission into the group of solitons after it has passed the zone where the depth changes abruptly. The obtained solutions extend the class of those represented earlier by S.F. Dotsenko and his colleagues.

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On the weak impact of the 26 December Indian Ocean tsunami on the Bangladesh coast

Cited by 35 publications

References 10 publications

The Effect of a Submarine Canyon on Tsunami Propagation in the Gulf of Arauco, Chile

The Effect of a Submarine Canyon on Tsunami Propagation in the Gulf of Arauco, Chile

Runup of Tsunami Waves in U-Shaped Bays

Wave Dynamics in the Channels of Variable Cross-Section

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