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It is known that a dysoxic water mass threatens oyster farming in Dangdong bay. A density current generator is planned to be installed to solve this problem. In this study, we reconstructed the tide level, physical field and dysoxic water mass in Dangdong bay by using numerical simulation and comparing with field measurements and investigated the effect of density current generator by installing it...
Carbon capture and storage (CCS) is a potentially effective counter measure against global warming. CO2 storage in deep saline aquifers using the sealing effect of gas hydrate is of great interest nowadays, due to the large capacity of CO2 storage in sub-seabed sand sediments and low risk of CO2 leakage. In this method, the leaked CO2 rises into sub-seabed sand sediments under high pressure and low...
Carbon Capture and Storage (CCS) is one of the important solutions against the increase of CO2 emission in the world. Especially, technology of CO2 storage under the seafloor gathers attentions and is promoted to reach on practical stage until 2020 in Japan. In this study, we developed the estimation method to specify the leakage information such like location and time for leakage accident. Our method...
In recent years, the environmental relevance of coastal areas has increased. Therefore, development of environmentally friendly breakwaters is strongly expected. We selected three cases as the breakwater arrangements; one with no breakwater, one with conventional breakwater often seen near the mouths of Japanese bays, and finally a new breakwater procuring enhancement of water exchange. We studied...
As the environmental value of waterfront areas has gained recognition, it has become evident that breakwaters are required which function not only to keep the water surface within harbors calm but also to maintain water quality. In this situation, we investigated the effectiveness of the new Ofunato breakwater design. We carried out experimental and numerical analysis with/without breakwater. In both...
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