Sharif University of Technology Scientia Iranica 1026-3098 32 7 2025 03 01 Hydrodynamic and biological assessment of modified meander C-type fishway to pass rainbow trout (Oncorhynchus mykiss) fish species 23459 10.24200/sci.2023.59941.6505 EN Saman Baharvand Department of Water Engineering, Faculty of Civil Engineering, Jundi-Shapur University of Technology, Dezful, Iran. Babak Lashkar-Ara Department of Water Engineering, Faculty of Civil Engineering, Jundi-Shapur University of Technology, Dezful, Iran. Journal Article 2022 02 10 Human-made structures are the main obstacles constructed on the river’s cross-section, preventing fishes from swimming toward the ideal spawning zones upstream of the streams. Present study determines the hydrodynamic performance of a Modified Meander C-type Fishway (MMCF) with a 20% bed slope using both physical and numerical modeling. Specifically, the study investigates the variations in Turbulent Kinetic Energy (TKE) and fluid friction coefficient (𝐶𝐶𝑓𝑓) in the pools, which are critical hydraulic characteristics of the fishway. The study examines the TKE variation for different discharge and geometry scenarios through the longest path in the pools of the MMCF. This analysis was performed at an average depth of 0.5d to investigate the possibility of creating resting pool areas in the fishway, where fish can rest during their migration. In addition, the propulsive energy of three hypothetical rainbow trout fish species was estimated based on their physical characteristics, including weight, length, swimming speed, and time to exhaustion, using empirical relationships. The propulsive energy of the fish species was evaluated for different levels of volumetric energy dissipation in the measuring pool of fishway, and the study discussed the ability of migratory fish species to safely navigate through the pools of fishway. https://scientiairanica.sharif.edu/article_23459_5af5800401bb2c3efdba64066efcc817.pdf