Abstract
In this research, the attentions are focused on the gravel deposit in the pool-and-weir-fishway and fish behavior. The purposes of this study are examined the effect of the run-up ratio (Rr) on gravel deposit and to make clear the fish behavior. Therefore, the experiments were done. As a result, gravel deposit has decreased the area of plunging flow. Then, Rr of Run2 decreased by approximately 60(%) compared to Run1. Because gravel deposited in the pools, fish rested around the pockets of gravel. Moreover, regardless of the possibility of gravel, fish exerted the unique behavior against the flow and fish swam near the sidewall by choice. The flow velocity of the areas where fish swam was approximately 6BL ~8BL (cm/s).
