Many types of breakwater have been developed to withstand the emormous wave force of a deep sea area.However, most have not proven viable in terms of constructability, economy and so on. The sloping slit caisson is expected to overcome these problems. It acts to dissipate wave energy by a front perforated wall and a wave chamber.The downward force acting on the slope increases the caisson's stability.This study describes the efficiency, design and construction method, and then explains the results of actual construction.
This paper describes the influence of surface waves on salt-wedge intrusion in terms of radiation stress. Radiation stress may increase salt-wedge intrusion when surface waves propagate up a river. This study thus aims to reveal the effect of radiation stress on the distance of salt-wedge intrusion by using fully nonlinear strongly dispersive internal wave equations and three-dimensional numerical computation model, Fantom3D. Fully nonlinear strongly dispersive internal wave model reveals the possibility that large radiation stress is induced near the river mouth and increases the distance of salt-wedge intrusion. Three-dimensional numerical model also demonstrates that there is a significant difference in the intrusion distance by taking into account radiation stress.
In the early morning of Sep. 26, a huge earthquake, which named "2003 Tokachi-oki earthquake" had stricken to the eastern coast of Hokkaido Island. This earthquake caused serious damage to roads, dikes , lifelines as well as harbor facilities. The significant damage of quay walls was found in the wharf No .4 in the western port of Kushiro. This paper aims to examine the process of seismic damage which occur to the gravity type quay walls of the wharf No.4 in the western port of Kushiro. Field survey to measure the deformation of gravel backfill behind concrete caisson and numerical simulation of seismic response on the damaged quay walls were conducted. And the causal factor and process of seismic damage to quay walls were discussed.
This paper describes the influence of surface waves on salt-wedge intrusion in terms of radiation stress. Radiation stress which includes Stokes drift effect may increase salt-wedge intrusion when surface waves propagate up a river. This study thus aims to reveal the effect of radiation stress on the distance of salt-wedge intrusion by fully nonlinear strongly dispersive internal wave equations and three-dimensional numerical computation model, Fantom3D. Fully nonlinear strongly dispersive internal wave model reveals the possibility that large radiation stress is induced near the river mouth and increases the distance of salt-wedge intrusion. Three-dimensional numerical model also demonstrates that there is a significant difference in the intrusion distance by taking into account radiation stress.
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