山地流域における出水と土砂流出 (8)

Abstract

The authors carried out some observations on the runoff of rain, sediment yield and trans-port in a mountain watershed, called Ashiaraidani (7.2 km2), which is a tributary of the JintsuRiver in Gifu Prefecture, Japan. This paper presents some results of the observations on runoffcharacteristics, on rate of sediment yield and transport, and on stream channel variations beforeand after floods in the Hirudani experimental watershed (0.85 km2).The process and mechanism of sediment transport during a flood in the Ashiaraidani streamchannel were partially revealed through the observation of flows and channel variations on thestream by the TV camera. The mechanism of occurrence and behavior of debris flow were ana-lyzed by the variation of river bed, and the water balance of debris flows in Ashiaraidani experi-mental watershed (6.5 km2).