海洋肥沃化装置「拓海」に係わる実海域計測

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TAKUMI project is one of the development researches of the Marino-Forum21. National Maritime Research Institute is taking charge of acquisition and analysis of field data. We report the outline of measurement and some results of data analysis. The Ocean Nutrient Enhancer "TAKUMI" is a SPAR type floating structure with a riser pipe. By pumping up the Deep Ocean Water (DOW) containing rich nutrient, and sprinkling near the sea surface, plankton is made to increase and it aims to form a good fishing ground. TAKUMI was installed in the Sagami Bay in May 2003 and is still working now. TAKUMI has several measuring equipments, for example, wave height meters, wind sensors, DGPS, gyroscope, accelerometers and strain gauges on the riser pipe. In this report, we explain the way to measure and storage the data on the sea, at first. Secondly, we show typical preliminary analyzed data. Then, we present some detailed analysis data, i.e. the movement of TAKUMI, strain of riser pipe, wave and wind condition. For detailed analysis, we have developed some new analysis methods. The motion of the center of gravity can be calculated from the data of accelerometers and gyroscope. The mean wave period of wind-wave and swell can be obtained by using a simplified estimation method based on nonlinear programming method. As a result, some new findings are obtained as follows. I) The position of TAKUMI strongly depends on the current change. 2) The strain of riser pipe strongly depends on roll and pitch motion, though there is little correlation between the strain and the current. 3) The wind speed at TAKUMI is twice as high as that along the shore, and the turbulence of wind is very small. These data and analysis are useful not only for the improvement of TAKUMI but also for development of the new ocean engineering apparatus, such as wind-farm on the sea.
独立行政法人海上技術安全研究所の論文
2006-12-22

海洋肥沃化装置「拓海」に係わる実海域計測

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