洪水流航空写真の画像解析

抄録

The aerial stereo photograph of a flood flow which is generally covered by patterns of foams and turbid flow was first analyzed by Kinoshita to obtain velocity distributions over the whole surface using parallax method.
In this paper, the automatically analyzing method of the same kind of photographs practical use was proposed. The cross-correlation method was used to obtain velocity vectors, and the method to correct the erroneous vectors and one for matching a pair of photographs were proposed.
Using the resultant distribution of velocity vectors the distributions of vorticity, divergence and streamlines were calculated and the structure of vortices occurring around the edge of the flood pain was examined.