Abstract
Sediment production in a mountainous watershed is the information essential for the integrated sediment management. However, it is not easy to collect the information, particularly to predict the sediment production volume because the sediment production process is very complicated. The seasonable change in the situation of bare slopes strongly affecting the sediment production process makes the modeling more difficult. So far, we have tried to obtain the relation between sediment production and rainfall, but we have to consider the structural change of the surface layer of bare slopes. In this paper, we have described the characteristics on sediment production based on a long-term observation data in the Takahara river basin as a first step of the developing a sediment production model. The data have shown the sediment production is dependent on the rainfall events, but the volume is strongly dependent on the situation of surface layer of the slopes.
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