Abstract
This paper deals with a method for analysis of tidal flow patterns in the Seto Inland Sea hydraulic model. Usually the patterns are analyzed through the observation of the drift of floats on the surface of the water. Observations are made in respect of a number of floats, over a wide area for long periods. One experiment yields numerous data. The analysis of such data by the method hereto requires very much time and is laborious.
A number of drifting floats are photographed at intervals of a predescribed time with a camera from above. Then the images in a roll of developed film are projected by a projector one after another with proper optical enlargement onto a screen from behind. The positions of the individual floats are read by the coordinates reading device, and punched out in the form of time-sequence data by a puncher. The paper tape is led into a minicomputer, which analyzes the data and issues to an automatic drafting machine a command to draft. Thereby the paths of a number of drifting floats are drawn out so speedily and accurately that an analysis of tidal flow on the scale of the Seto Inland Sea hydraulic model can be carried out by a few operators in a short period of time.
