Experimental Investigation of the Reynolds Shear Stress Exceedance Rate for the Injury and Disorientation Biocriteria Boundary in the Pool-Orifice and Vertical Slot Type Fishways

Fragmentation of rivers has a negative impact on river’s ecological status which can be improved by the construction fishways next to obstacles in that prevent free migration. Flow field characteristics are key factors design process hydraulically efficient fishways—flow and turbulence patterns functional fishway allow fish enter, progress through exit with minimum time/energy expenditure. The aim this paper is an experimental study flow measured physical model goal providing information Reynold’s shear stress distribution would facilitate their accordance environmental requirements. focus research was nominally con-figuration pool-type fishways—pool-orifice vertical slot. Fishway geometry varied for bottom slope (7.5%, 10% 12.5%), pool length (45 cm, 60 cm 90 cm) orifice size (8 × 8 10 12 scaled 1:3 prototype. Since been identified as main turbulent parameter affecting swimming performance behavior, it used basis analyses. velocity data were collected Vectrino ADV processed all three planes—streamwise, horizontal vertical. analyzed according injury (>50 N/m2) disorientation (>30 biocriteria boundaries defined literature. percentage exceeding depending geometry. results obtained suggest critical pool-orifice VS fishway. generally highest layer surface slot fishways.