| In this study, the effects of sediment supply on fish habitat focused on water-column fish species are discussed. A flume experiment was conducted with boulder-bed which is modeled after armor coated boulder-bed downstream of large dams. At first, the characteristics of velocity profile are discussed, especially in roughness layer. As the gaps among boulders are filled with pebbles, velocity near the bed-surface get larger and the depth of roughness layer become thin. Secondly, an estimation of space volume which is suitable for fish cruising speed is applied to experimental result date. Finally, a consideration to construct a quantitative estimation for fish habitat with sediment supply is presented. |
