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Numerical investigation of seismic-induced harbor oscillations
Abstract For the first time, transient seismic-induced oscillations inside an actual harbor are investigated using a fully nonlinear Boussinesq-type wave model. To this end, the open-source code FUNWAVE-TVD, developed by Shi et al. (2012), is extended to include seismic effects by adding a time-dependent forcing term to the governing equations. This extension is fully validated against analytical solutions and experimental data available in the literature. Uni-directional harmonic seismic excitation is considered as an approximation in the case study of Hambantota Port. Results reveal that the natural modes of Hambantota Port with periods of O (100–1000 s) can be triggered by seismic disturbances with periods of O (1 s). Some modes that are generated immediately under the excitation are found to be those of sloshing. Thus, a possible mechanism for the seismic-induced long-period harbor oscillations is proposed using a sloshing theory. Subsequently, it is determined that the seismic direction has significant effects on the excitation of natural modes and the energy decay rate. Lastly, the seismic influence on the wave motions inside the harbor including a consideration of the incident waves from the open sea is examined.
Highlights The seismic-induced oscillations within an actual harbor are first investigated systematically using a Boussinesq model. The natural modes of a port with periods of O (100–1000 s) can be triggered by a seismic disturbance with periods of O (1 s). A possible mechanism for the seismic-induced long-period harbor oscillations is interpretated using the sloshing theory. The influence of the seismic direction on the harbor oscillations is examined. The hydrodynamic response of a harbor to both an earthquake and the disturbance of the incident waves is investigated.
Numerical investigation of seismic-induced harbor oscillations
Abstract For the first time, transient seismic-induced oscillations inside an actual harbor are investigated using a fully nonlinear Boussinesq-type wave model. To this end, the open-source code FUNWAVE-TVD, developed by Shi et al. (2012), is extended to include seismic effects by adding a time-dependent forcing term to the governing equations. This extension is fully validated against analytical solutions and experimental data available in the literature. Uni-directional harmonic seismic excitation is considered as an approximation in the case study of Hambantota Port. Results reveal that the natural modes of Hambantota Port with periods of O (100–1000 s) can be triggered by seismic disturbances with periods of O (1 s). Some modes that are generated immediately under the excitation are found to be those of sloshing. Thus, a possible mechanism for the seismic-induced long-period harbor oscillations is proposed using a sloshing theory. Subsequently, it is determined that the seismic direction has significant effects on the excitation of natural modes and the energy decay rate. Lastly, the seismic influence on the wave motions inside the harbor including a consideration of the incident waves from the open sea is examined.
Highlights The seismic-induced oscillations within an actual harbor are first investigated systematically using a Boussinesq model. The natural modes of a port with periods of O (100–1000 s) can be triggered by a seismic disturbance with periods of O (1 s). A possible mechanism for the seismic-induced long-period harbor oscillations is interpretated using the sloshing theory. The influence of the seismic direction on the harbor oscillations is examined. The hydrodynamic response of a harbor to both an earthquake and the disturbance of the incident waves is investigated.
Numerical investigation of seismic-induced harbor oscillations
Zheng, Zhenjun (author) / Ma, Xiaozhou (author) / Ma, Yuxiang (author) / Perlin, Marc (author) / Dong, Guohai (author)
Coastal Engineering ; 165
2020-12-27
Article (Journal)
Electronic Resource
English
Numerical investigation of transient harbor oscillations induced by N-waves
| British Library Online Contents | 2017