Author(s): Sung-Uk Choi; Byungwoong Choi; Jiyeon Jang
Linked Author(s): Sung-Uk Choi
Keywords: No keywords
Abstract: Hydropeaking flows are known to affect badly downstream fish habitats. This study investigates the impact of natural flow regime on downstream fish habitat in a reach regulated by an upstream dam. For this, the physical habitat simulation is used. A 13.4 km long reach downstream from the Yongdam Dam is selected for the study area. Three dominant fish species are selected as target fishes. The Nays2D model and the habitat suitability index model are used for the hydraulic and habitat simulations, respectively. In order to construct dam operation scenarios for the natural flow regime, the Building Block Approach is used. Two hydrological methods by considering the magnitude and duration of the inflow and by averaging the inflow over each month are used. The weighted usable areas for dam operation scenarios and hydropeaking flows are computed and discussed.