山地流域における出水と土砂流出 (10)

Abstract

Observational research of sediment yield and transport have been carried out in mountainbasin called Ashiaraidani (7.2km2), which is located in the Northern Japan Alps Range.This paper presents some results of the observations on runoff characteristics, on rate ofsediment yield and transport, and on stream channel variations before and after floods inthe Hirudani basin (0.85 km2). These major observational research efforts have produceda bedload equation that can be used in gravel-bed steep channels with stair-like sequencesof pools and chutes.The process and mechanism of sediment transport during a flood in the Ashiaraidanistream channel were partially revealed through the observation of flows and channel variationson the stream by the TV camera.