山地流域における出水と土砂流出 (7)

Abstract

The authors carried out some observations on the runoff of rain, sediment yield and transportin a mountain watershed, called Ashiaraidani (7.2 Km2), which is a tributary of the Jintsu Riverin Gifu Prefecture, Japan.In this paper, the process and mechanism of sediment transport on the stream channel inHirudani experimental watershed were analyzed by petorological and grain-size classification oftransported gravels. Colored gravels were also used as the tracer to identify the characteristics ofsediment particle movements.The mechanism of occurrence and behavior of debris flow were partially revealed throughthe field observations on variation of river bed, and the water balance of debris flows in Ashiaraidaniexperimental watershed (6.5 Km2).