Hydrodynamic and Biological Assessment of Modified Meander C-type Fishway to pass Rainbow Trout (Oncorhynchus mykiss) Fish Species

Document Type : Article


Department of Civil Engineering, Jundi-Shapur University of Technology, Dezful, Iran


Different fish species swim upstream region in the spawning season. Dams, culverts, and other human-made structures are the main obstacles constructed on the river’s cross-section, preventing fishes from swimming towards the ideal spawning zones upstream of the streams. In the present paper, according to the reported bed slope ranges for different fishway structures, the hydrodynamic performance of modified meander c-type fishway with a bed slope of 20% was studied using physical and numerical modeling. Turbulent Kinetic Energy distribution and fluid friction coefficient variation for different discharge and geometry scenarios are studied for the steep bed condition. The study presents turbulent kinetic energy and friction coefficient parameters as critical hydraulic characteristics of the modified meander c-type fishway. The TKE distribution graphs for different discharge and geometry scenarios through the longest path in the pools of the MMCF were investigated using the line probe technique in an average depth of 0.5d. The propulsive energy of three hypothetical rainbow trout fish species was estimated using the empirical relationships between weight, length, and the swimming velocity of the desired fish species. The propulsive energy of fish species was assessed for different volumetric energy dissipation in the measuring pool of the modified meander c-type fishway.


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