3-D Numerical Study of a Bottom Ramp Fish Passage Using Smoothed Particle Hydrodynamics

Worldwide, the overwhelming number of man-made barriers in fluvial systems has been identified as one major causes reported staggering average declines migratory fish. Fish passages have shown to help mitigate such problems. Close-to-nature types fish passages, bottom ramps, bypass channels, and ramps can be used minimize impact artificial steep drops (e.g., weirs) on migration aquatic fauna, especially cases low-head barriers. This study focuses characterization flow pattern a ramp. A 3-D numerical model based meshless smoothed particle hydrodynamics (SPH) method was successfully validated then employed for simulation turbulent free-surface straight channel with complex geometry. The effects bed roughness, slope, rate were quantified terms depth, velocity fields, area‒velocity ratios. During study, several new tools developed, leading functionalities pre-processing, solver, post-processing which increase applicability DualSPHysics field eco-hydraulics.