Computational fluid dynamics simulations of water flow on a studded upstream eel pass

The European eel population has undergone a significant decline in recruitment over the last 3–4 decades. Anthropogenic riverine barriers that disrupt eel's life cycle when migrating upstream are contributory factors this decline. development of passage facilities is one many attempts to mitigate problem. In passes, eels rely on substrate base pass assist their ascent by climbing and/or swimming. This study numerically evaluates, using computational fluid dynamics, hydrodynamic characteristics water flow studded substrate, under range installation angles and flowrates. To assess predict efficiency pass, simulated field data were used create pass-ability maps comparing velocity with swimming capabilities. An 11° angle ramp flowrate 1.12 × 10−3 m3/s per metre width was shown be likely most suitable for 70 mm long eels, could sizes up 150 mm. numerical also specific flowrates, 30° or more can make level fluctuate splash out resulting potential inefficiency supply, while posing additional challenges ascending pass.