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.
The channels of the fluid machinery and plants have rather simple contours of the cross and longitudinal sections such as quadratic surfaces or tori. Murai and et al's method for the use of a non-metric camera and Okamoto et al's method for multi-layer analytical photogrammetry with a little modification were applied to photogrammetry through the surfaces of the channels. The results of experimental investigations on the plane and the cylindrical surface with a circular cross-section as the refraction planes revealed that the methods have sufficient accuracy for the flow measurements by the CCD-camera and image-proccesor system.
Landslide often generates during rainfall or snow-melting season on slope of Mt. Zinbadaira, where is located at a distance of about 10 km west from Nagano-city. Image data of MOS-1 are examined in order to clarify the characteristics of ground surface with distribution of landslide occurred in the past. In this analysis, CCT value ratio of the near-infrared band to the visible band is discussed, taking mean value of a group of pixels in meshes drawn in the investigated area. It is ascertained that a number of landslides occur in such regions as the band ratio abruptly varies. From it's distribution, surface conditions are divided into two categories by comparing with the topography. At first the ratio has comparatively smaller one in the slope area where turns into gentle from steep mountain side, and it seems that creep movement of slide deposit disturbs vegitation cover. On the other hand, the band ratio becomes larger in steep slope area where may be formulated by erosion along dales in the lower part of the area. Accordingly there is a possiblity that slope becomes unstable due to the increase of water content in such area as showing plant growth.