定期航路船舶による海洋モニタリングを実施する上での船体利用の定式化と効率化に関する研究

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In the first part of the report, we deal with the hydrodynamic property of VOS (volunteer observing ship) to lend itself to direct monitoring of seawater. The original depth of seawater sampled at the stern at mid draft of the ship of opportunity for monitoring was estimated by model ship in an experimental basin. We injected dye from the upstream of the model ship and picked the water up from the inlet, and then the density occupation rate of dye in the water taken from the fixed inlet (sea chest) was analyzed by use of a spectrophotometer. By iterating the same sort of measurements changing the location of the dye injection point, we obtained a contour map of the occupation rate of dye. Furthermore, CFD (computational fluid dynamics) was employed to confirm the model experiment. The experiment in regular waves was conducted to make above method extend to be applicable in real ocean condition. In addition, full size numerical computation was performed to validate the new method in its practical use. Results showed that the sampled water comes from near the water surface. In the scale of ferry being used for monitoring, it was predicted that water at -0.7m was drawn into the inlet at -4 to -5m in depth. In the latter part of the paper we examine a simplified method of real time monitoring with diluted ingredient oil as a test material. Observations in actual sea were conducted and the samples were chemically analyzed in more precise in laboratory as well. The fluorescent spectroscopic analysis was found to be applicable to design the on board equipment and measurement system in the near future. A part of the paper was presented at two international workshops held in Japan and US as a contribution to the global monitoring system of ocean pollution.
独立行政法人海上技術安全研究所の論文
2003-05-31

定期航路船舶による海洋モニタリングを実施する上での船体利用の定式化と効率化に関する研究

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