Tidal stirring and its impact on water column stability and property distributions in a semi-enclosed shelf sea (Seto Inland Sea, Japan)

Kobayashi, Shiho; Simpson, John H.; Fujiwara, Tateki; Horsburgh, Kevin

doi:10.1016/j.csr.2006.04.006

Cited by 31 publications

(22 citation statements)

References 17 publications

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“…The simulation period for the M2 tide was 7 days. Compared with previous studies (Kobayashi et al, 2006;Yanagi and Higuchi, 1981) in terms of co-amplitude, co-phase, and tidal ellipse charts of M2 tide, the characteristics of simulated M2 tide such as tidal amplitudes and phases in the SIS described above are well agreed with (not shown here). The Suo Nada and the Hiuchi Nada appears to have in almost the same tidal phase indicating of the rising and falling of water levels like standing waves within each nada, respectively.…”

Section: Validations Of Gerrissupporting

confidence: 81%

Tsunami-Tide Interaction in the Seto Inland Sea, Japan

Shimoyama

Lee

2014

Int. Conf. Coastal. Eng.

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Tsunami-tide interactions in the Seto Inland Sea (SIS) were investigated by taking into account the effects of tidal currents on the tsunami propagation in terms of the arrival time and the run-up heights along the coast of SIS. The initial tsunami wave profile was introduced by the possible Tokai-Tonankai-Nankai Earthquake of the magnitude Mw9.0, which is equivalent to that of 2011 Tohoku Earthquake. Numerical experiments with four different tidal phases, flood, ebb, high, and low, reveal that the water depth changes due to tides affect the tsunami propagation in terms of heights and arrival time. During high tides, the tsunami propagates faster and reaches higher than during the low tides. In addition, during the flood tides with rising water level, tsunami propagates faster than during the ebb tides. Further investigation also shows that the tsunami-tide interaction changes the tsunami signal such that the tsunami-only spectra shifts the spectral peaks after considering the tsunami-tide interactions. Local oscillation modes characterized by local bathymetry and topography shift to higher frequency modes due to the non-linear tsunami-tide interaction. To reduce the uncertainties involved in tsunami predictions and coastal defenses and management, it is strongly recommended to simulate tsunamis together with tides in shallow water environments.

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Section: Validations Of Gerrissupporting

confidence: 81%

Tsunami-Tide Interaction in the Seto Inland Sea, Japan

Shimoyama

Lee

2014

Int. Conf. Coastal. Eng.

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“…This is the first case to apply POMgcs to simulate tidal currents and river plume around Kojima Bay, while tidal and residual currents in the Seto Inlans Sea are simulated using POM [3] in previous studies (e.g. [6,4]). The Coriolis parameter is 8 × 10 −5 s −1 at a latitude of 34°.…”

Section: Model Configuration and Data For Model Optimizationmentioning

confidence: 99%

“…We then conducted the sensitivity experiment with perturbations in both the bottom drag coefficient and the harmonic constituents along the open boundaries (Table 1). In addition to these parameters, the stable increment of water level at the western boundary was also perturbed as a controllable factor, following the distribution of tidal energy flux in the Seto Inland Sea [6]. The differences between the baseline and sensitivity experiments essentially provide the column vectors of the Green's functions matrix [5].…”

Section: Parameter Optimization Using Green's Functionsmentioning

confidence: 99%

Parameter optimization of a 3D coastal model using Green's functions for modelling river plume dynamics

Kobayashi

Nakada

Takagi³

et al. 2016

JASSE

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Abstract. River plumes flowing into channels with strong tidal currents cause pulsed decreases in the salinity around the river mouth. This study constructs a numerical model for reproducing the river plumes of Asahi and Yoshii Rivers flowing into Bisan Seto, a tidal channel in the Seto Inland Sea. Recently inverse estimation of the model parameters using Green's functions has been applied to numerical modelling of sea shelves as a simple and effective method of parameter optimization. This paper examines the method that aims to improve the precision of the model results, but uses a model domain (ca. 50 km) that is much smaller than in previous studies. The reproducibility of the tidal elevations and currents was improved significantly by the parameter optimization procedures. The reproducibility of the temporal changes in salinity was also improved, although they showed strong nonlinearity. These results indicate that the inverse estimation of model parameters using Green's functions can greatly improve the reproducibility of the modelling of river plumes flowing into tidal channels.

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“…The phase difference in the tidal currents between the two channels and the center of the SIS is approximately 408 (approximately 1 h). The coamplitude and cophase charts of the M 2 tide on the left are obtained from Yanagi and Higuchi [1981], and the tidal ellipses chart on the left is from Kobayashi et al [2006].…”

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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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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Tidal stirring and its impact on water column stability and property distributions in a semi-enclosed shelf sea (Seto Inland Sea, Japan)

Cited by 31 publications

References 17 publications

Tsunami-Tide Interaction in the Seto Inland Sea, Japan

Tsunami-Tide Interaction in the Seto Inland Sea, Japan

Parameter optimization of a 3D coastal model using Green's functions for modelling river plume dynamics

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

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