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Communication Dans Un Congrès Année : 2024

Towards a reliable and validated toolbox to replace live fish tests for the assessment of injury and mortality during downstream passage

Résumé

Live fish tests remain as the most common method to evaluate the risk of injury or mortality during turbine and pump passages. Considering sites at which the risk of injury and mortality can be reasonably assumed to be either too high or negligible, a multi-stage method using passive sensors and numerical models is proposed as an alternative to replace live fish tests. Three alternative approaches are available to replace live fish tests which have already been applied in both lab and field studies: (1) analytical and statistical blade strike models based on hydraulic machinery geometry, flow conditions and fish kinematics, (2) Computational Fluid Dynamics (CFD) approaches coupled with models to account for the passage of fish and (3) sensor systems which record at a minimum, the total pressure and linear acceleration during passage. Blade strike models have been applied for several decades and are well-studied and continuously improved. Case-specific validation studies however show good agreement as well as high uncertainty. CFD studies are limited to well-documented sites and still await to be validated using field data collected from live fish tests. Sensor systems can provide reliable assessments of barotrauma risk due to pressure changes, but only when biological reference data are available. Estimating the risk of collision-related events using passive sensors remains challenging due to the substantial differences between the physical properties of the sensor body and that of live fish. To address knowledge gaps related to collision-related injury and mortality, current sensor technologies were analyzed and a laboratory strike system was developed to investigate blade impact events under controlled conditions. Finally, we provide insight into how and why existing approaches are prone to fail to accurately assess blade impact events and propose an alternative type of sensors.

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Dates et versions

hal-04642604 , version 1 (11-07-2024)

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  • HAL Id : hal-04642604 , version 1

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Stefan Hoerner, Wolf Iring Kösters, Shokoofeh Abbaszadeh, Falko Wagner, Jeffrey A Tuhtan. Towards a reliable and validated toolbox to replace live fish tests for the assessment of injury and mortality during downstream passage. IAHR 15th International Symposium on Ecohydraulics and Fish Passage, May 2024, Quebec City, Canada. ⟨hal-04642604⟩

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