Verification of Hydraulic Parameters of Nature-like Fish Pass

Nature-like fish passes are commonly designed as a preferred way to overcome barriers in rivers. However, meeting the recommended hydraulic parameters for these can be challenging. As result, boulders or sills often incorporated supplement their structure. From standpoint, crucial under investigation depths and velocities (or corresponding velocity field). In this study, comprehensive analysis was conducted on full-width rock-ramp pass constructed river, specifically targeting barbel zone. The achieved were assessed through direct field measurements, complemented by mathematical modeling using 1D 2D HEC-RAS models (version 6.3.1). For assessment of model accuracy, error indices root mean square (RMSE) absolute (MAE) used. Based evaluation, provides more precise results profiles (the RMSE (m) 0.0663 (for (m∙s−1) 0.293) compared model, where 0.070 0.398), MAE 0.0350 0.185) 0.0375 0.274)). findings highlight differences problem-solving approaches between well potential simplifications practical applications.