Abstract
In order to develop the fish place around Okinotori-Shima, it has been required that the fertilization of ocean by the nutrient-rich deep seawater. In this proposal, the upwelling method by perpetual salt fountain has been investigated. When the upwelling pipe is moored at the bottom of the ocean, it has a possibility of gradient of the upwelling of pipe. In this study, to moor the upwelling pipe at Okinotori-Shima, the method which spread the streamline upwelling pipe by using container is proposed. To establish this method, the spreading condition of upwelling upwelling pipe was designed and the availability of spreading method of pipe using container was evaluated. The gradient of pipe was modeled with drag coefficient measured by drag force measurement experiment and the buoyancy of the buoy to moor the streamline upwelling pipe at the bottom of the ocean was calculated. And also, the experiment of spreading of the 25 m upwelling pipe was conducted and the spreading of the pipe and the movement of dropping of container were observed. Using this experimental result, dropping movement of container at Okinotori-shima was evaluated.
