抄録
Recently monitoring of sea healthiness using voluntary observation ships has been carried out. In the monitoring, seawater is sampled through an inlet located on a ship hull, and the water is analyzed chemically and biologically. In the coarse of analyses, the information of original position of sampled water is one of important factors to assess the sea healthiness, and in the paper, an empirical method to estimate the original location of sampled water is described.
In the experiment, dye is injected from the upstream of the ship. The water around ship is picked up from the inlet, and then dye concentration in the sampled water is analyzed using a spectrophotometer. The concentration is mapped onto the plane of dye injection and we thus show the original location of sampled water as a contour map on the upstream sectional plane.
