Abstract
Previous studies have described the important functions of debris-feeding mammals inhabiting riverterraces. However, most previous studies mainly focus on the function from the point of view ofbehavioral ecology. Therefore, we studied the hydraulic formation process of debris from the point of view of river engineering.In the results, our study clarified the followingphenomena: (1) The channel meandering enhanced the water surface gradient between the central channel and the inside channel during floods. And the gradientenhanced the water current to transport the organic debris into the river terraces; (2) Trees filtered the organic matter and supported debris formation. These results indicated that the meandering and trees were important for debris formation.
