Storm Surge in Seto Inland Sea With Consideration of the Impacts of Wave Breaking on Surface Currents

Lee, Han Soo; Yamashitâ, Takao; Komaguchi, Tomoaki; Mishima, Toyoaki

doi:10.9753/icce.v32.currents.17

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…The potential Takai-Tonankai-Nankai-linked earthquake and tsunami source region along the Nankai Trough, which was revised and issued by the Central Disaster Prevention Council, Japan (modified from Figure V Journal of Geophysical Research: Oceans 10.1002/2015JC010995 Japan, the tide and tidal currents are high and very strong and are dominant physical processes in the SIS's coastal environment. Therefore, taking the impacts of tides and tidal currents on extreme tsunami propagation in the SIS into account is critical for coastal protection and disaster prevention [Lee and Kaneko, 2015;Lee et al, 2010;Shimoyama and Lee, 2014].…”

Section: Introductionmentioning

confidence: 99%

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Impacts of tides on tsunami propagation due to potential Nankai Trough earthquakes in the Seto Inland Sea, Japan

2015

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The impacts of tides on extreme tsunami propagation due to potential Nankai Trough earthquakes in the Seto Inland Sea (SIS), Japan, are investigated through numerical experiments. Tsunami experiments are conducted based on five scenarios that consider tides at four different phases, such as flood, high, ebb, and low tides. The probes that were selected arbitrarily in the Bungo and Kii Channels show less significant effects of tides on tsunami heights and the arrival times of the first waves than those that experience large tidal ranges in inner basins and bays of the SIS. For instance, the maximum tsunami height and the arrival time at Toyomaesi differ by more than 0.5 m and nearly 1 h, respectively, depending on the tidal phase. The uncertainties defined in terms of calculated maximum tsunami heights due to tides illustrate that the calculated maximum tsunami heights in the inner SIS with standing tides have much larger uncertainties than those of two channels with propagating tides. Particularly in Harima Nada, the uncertainties due to the impacts of tides are greater than 50% of the tsunami heights without tidal interaction. The results recommend simulate tsunamis together with tides in shallow water environments to reduce the uncertainties involved with tsunami modeling and predictions for tsunami hazards preparedness.

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Section: Introductionmentioning

confidence: 99%

“…Therefore, taking the impacts of tides and tidal currents on extreme tsunami propagation in the SIS into account is critical for coastal protection and disaster prevention [Lee and Kaneko, 2015;Lee et al, 2010;Shimoyama and Lee, 2014].…”

Section: 1002/2015jc010995mentioning

confidence: 99%

Impacts of tides on tsunami propagation due to potential Nankai Trough earthquakes in the Seto Inland Sea, Japan

2015

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“…1). As parts of Japanese coast under frequent passes of typhoons in summer, the SIS experiences frequent storm surges (Lee et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Modelling Extreme Sea Levels Due to Sea Level Rise and Storm Surge in the Seto Inland Sea, Japan

Lee

2014

Int. Conf. Coastal. Eng.

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The extreme sea level due to storm surge and future sea-level rise (SLR) in the year of 2050 and 2100 are estimated by using ensemble empirical mode decomposition (EEMD) and extreme value analysis (EVA) with long-term sea level records in and around the Seto Inland Sea, Japan. Ensemble empirical mode decomposition, an adaptive data analysis method, can separate the tidal motions and the non-linear trend from the sea level records to reconstruct the storm surge levels, and then the reconstructed storm surge levels are applied to statistical model, EVA, to obtain the extreme storm surges at 95% confidence interval in the target return periods. The SLR trend at Tokuyama in the Seto Inland Sea obtained from EEMD is 3.58 mm/yr over 1993-2010, which is slightly larger than the recent altimetrybased global rate of 3.3 ± 0.4 mm/yr over 1993-2007. The resulting SLR in 2050 and 2100 estimated are 0.18 m and 0.49 m, respectively. The 30-, 50-, and 100-yr return levels at Tokuyama obtained by EVA are 1.30 m, 1.43 m and 1.64 m. Therefore, the extreme sea level in 2050 and 2100 due to future SLR and storm surge with 100-yr return level would be 1.82 m (1.35 m ~ 2.26 m with 95% confidence intervals) and 2.13 m (1.75 m ~ 3.10 m with 95% confidence intervals), respectively. The SLR is not only due to mass and volume changes of sea water, but also due to other factors such as local subsidence, river discharge and sediments, and vegetation effect. The non-linear trend of SLR, which is the residue from EEMD, can be regarded as a final consequential sea level after considering those factors and their nonlinearity. The combined EEMD-EVA method can be useful tool not only for the extreme sea level estimation under climate change, but also for many cases in coastal engineering and hydrology.

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“…The SIS is a largest long channel-shaped enclosed coastal sea in the western part of Japan with a size of about 23,000 km 2 , a length of about 500 km and an average depth of about 38 m 5) . It is connected to the outer Pacific Ocean and sea via the Kii Channel, the Bungo Channel and the Kamon Strait including approximately 1000 islands and a number of narrow waterways/straits (Seto in Japanese) connecting the basins (Nada in Japanese) and bays.…”

Section: Introductionmentioning

confidence: 99%

Regional Projection of Relative Sea Level Rise in the Seto Inland Sea, Japan

Lee

Kaneko

2014

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal E

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The future sea level rise (SLR) in the year of 2050 and 2100 are estimated by using ensemble empirical mode decomposition (EEMD) with long-term sea level records in and around the Seto Inland Sea, Japan. Ensemble empirical mode decomposition, an adaptive data analysis method, can separate the sea level records into intrinsic mode functions (IMFs) from high to low frequency and the residue. The residue is considered as the non-linear trend from the sea level records. The SLR trend at Tokuyama in the Seto Inland Sea obtained from EEMD is 3.58 mm/yr over 1993-2010, which is slightly larger than the recent altimetry-based global rate of 3.3 ± 0.4 mm/yr over 1993-2007. Then, the non-linear trend is utilized to project the regional SLR in the Seto Inland Sea. The resulting SLR in 2050 and 2100 estimated are 0.18 m and 0.49 m at Tokuyama, respectively. The SLR is not only due to mass and volume changes of sea water, but also due to other factors such as local subsidence, river discharge and sediments, and vegetation effect. The non-linear trend of SLR, which is the residue from EEMD, can be regarded as a final consequential sea level after considering those factors and their nonlinearity. The EEMD method can be useful tool not only for the SLR projection under climate change, but also for observed data analysis in coastal engineering and hydrology.

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Storm Surge in Seto Inland Sea With Consideration of the Impacts of Wave Breaking on Surface Currents

Cited by 7 publications

References 18 publications

Impacts of tides on tsunami propagation due to potential Nankai Trough earthquakes in the Seto Inland Sea, Japan

Impacts of tides on tsunami propagation due to potential Nankai Trough earthquakes in the Seto Inland Sea, Japan

Modelling Extreme Sea Levels Due to Sea Level Rise and Storm Surge in the Seto Inland Sea, Japan

Regional Projection of Relative Sea Level Rise in the Seto Inland Sea, Japan

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