Abstract
Quantitative and morphologic variation of river-bed deposits are surveyed by comparison of airphotographs taken in different stages in order to check the annual variation and the influence of disaster of Typhoon No. 26, 1966.
Many profiles along each same cross line settled on the airphotographs taken in 1957 and 1966 are drafted by stereoplanigraph C-8 and the areal variation of each profiles are summarized in connection with the river length between each cross line. In this surveyed area, river bed deposits are increased 2, 740, 000m3in volume for 9 years, and about 370, 000m3are derived by Typhoon No. 26.
The greater part of increased deposits are derived from ready-transported river-bed deposits, terrace deposits and talus deposits along river side, and volume from mountain land slides are not so much.
