Abstract
In this study, environmental impact of fine-grained dam sediment in the usage of material supply to rivers was discussed through laboratory tests. Dredging, transportation and putting sediment to downstream river was considered as a common method and the granular-forming treatment by cement stabilizer was mainly examined. The degree of concentration of suspended sediment and alkaline influence by the cement addition were focused as main two factors on environmental impact. Laboratory tests such as abrasion tests in the water and erosion tests by the running water were carried out and these test results were examined from the viewpoint of actual designing of sediment supplying to rivers. And it is made clear to reduce the degree of concentration of suspended sediment and to raise the possibility of recycling of fine-grained dam sediment as material supply to rivers by means of simple treatment.
