MAINTENANCE OF IMPROVED CHANNEL WITH POOL CONSTRUCTION IN MEANDERING ROCK-BED RIVERS

For preserving a comfortable river ecosystem, it is important to protect and restore the riffle and pools within engineered channels, where should play a role in the habitat diversity and complexity. It will be no easy task to restore and preserve the pool-riffle in flat rock-bed river which is lightly covered with gravels, as contrasted with in the gravel river. In the Abashiri River, the improvement by channel deepening projects with rock-bed has been carried out, in which was introduced to construct artificial pools. We investigate the restoration of the riffle and pools by constructing artificial pools. By field survey in the Abashiri River, the state of sediment on the improved channel is indicated. By undistorted model experiment, we investigate the deposition of artificial pools. As a result, it shows that the artificial constructed pools are corresponded to the location of generated ones in a mobile bed.