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Changes of Tides in Isahaya Bay due to a Barrier
육진희,최병호,김경옥 대한토목학회 2011 KSCE Journal of Civil Engineering Vol.15 No.3
A regional ocean tide model was designed to cover an area that is broad in scope and size, yet also provide a high degree of resolution for scientific and engineering interests. Using this model study, the changes in the tidal regime in the Ariake Sea after the construction of the dike in the Isahaya Bay were simulated in terms of the tide, tidal current, bottom shear stress, tidal energy dissipation and transport potential and free oscillation mode. The simulation results indicated the impact of the dike construction on the tidal regime by showing the general decreases in the tide, tidal current, the capacities of sediment transport and free oscillation period due to the construction of the dike.
육진희,김경옥,최병호 한국해양과학기술원 2015 Ocean science journal Vol.50 No.4
The Yellow and East China Seas are characterized by shallow shelf seas, seasonal monsoons and typhoons, especially the Korean Peninsula’s western coastal area, which features large tides, a complex coastline and many islands. This study implemented an integrally coupled tide-surge-wave model based on an unstructured grid to evaluate the impact of Typhoon Sarah, which occurred in September of 1959, on the Yellow and East China Seas and, specifically, the southern coast of Korea in terms of waves and storm surges. The model results projected a significant wave height of 2–7 m, a mean wave period of 4–14 sec, and positive surge heights that were 0.3–1 m along the southern coast of Korea. Additional model runs included two independent model runs for waves and tides, and one tide-surge model run was conducted to investigate the interactions in the wave, tide and storm surge processes. The coupled tide-surgewave model reasonably reproduced wave properties and storm surges, but uncoupled models, i.e. independent models, slightly overestimated waves and surges. The wave forces associated with the gradient radiation stress resulted in water being elevated into coastal regions, thereby the water elevation increased onshore and the reverse happened offshore. A possible water level change due to a storm equivalent to Typhoon Sarah in the year 2100 was estimated by considering a mean sea level rise of 70 cm and was generally in the range of 70–100 cm in the Yellow and East China Seas and approximately 68 cm along the southern coast of Korea.
육진희,조민수 한국해안,해양공학회 2023 한국해안해양공학회 논문집 Vol.35 No.4
High waves and storm surges due to tropical cyclones cause great damage in coastal areas; therefore, accurately predicting storm surges and high waves before a typhoon strike is crucial. Meteorological forcing is an important factor for predicting these catastrophic events. This study presents an improved methodology for determining accurate meteorological forcing. Typhoon Chaba, which caused serious damage to the south coast of South Korea in 2016, was selected as a case study. In this study, symmetric and asymmetric parametric vortex models based on the typhoon track forecasted by the Model for Prediction Across Scales (MPAS) were used to create meteorological forcing and were compared with those models based on the best track. The meteorological fields were also created by blending the meteorological field from the symmetric / asymmetric parametric vortex models based on the MPAS-forecasted typhoon track and the meteorological field generated by the forecasting model (MPAS). This meteorological forcing data was then used given to two-way coupled tide-surge-wave models: Advanced CIRCulation (ADCIRC) and Simulating Waves Nearshore (SWAN). The modeled storm surges and waves correlated well with the observations and were comparable to those predicted using the best track. Based on our analysis, we propose using the parametric model with the MPAS-forecasted track, the meteorological field from the same forecasting model, and blending them to improve storm surge and wave prediction.