The physical damage to body tissues caused by a rapid change in pressure. Commonly observed barotrauma injuries for fish include swim bladder rupture, hemorrhaging, and gas embolism and emphysema.
Below are a list of key terms and definitions related to the HydroPASSAGE project.
A relative measure of the impacts that hydropower structures will have on fish injury and mortality. Improved biological performance indicates that fish experience fewer adverse effects during passage.
The relationship between a stressor that a fish may experience during turbine passage with the predicted response (injury or mortality). Biological response relationships inform biological design criteria for turbine design and operation.
The Biological Performance Assessment (BioPA) toolset uses CFD simulations of the turbine design and operations to quantify the exposure of passing fish to rapid decompression, blade strike, shear forces and turbulence. Simulations are combined with fish dose-response relationships to objectively compare turbine designs and operations. BioPA is a Microsoft Excel-based program that integrates the exposure probabilities of stream traces and combines them with laboratory measurements of fish impacts.
The ability to go from a non-operational (shutdown) configuration to an operational configuration without the use of external electrical power.
The physical contact between a fish and turbine blade during hydropower turbine passage. This can result in injury and/or mortality for fish passing through the turbine environment. Fish can collide with many different structures in the turbine environment during passage, however, HydroPASSAGE Dose-Response testing has primarily focused on the impacts of blade strike.