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Phase I Development of an Improved Sea Lamprey Barrier Design

Flow features just below the low head dams that are used as sea lamprey barriers can  represent a public safety concern under some flow conditions.  In this project, an  improved barrier design will be developed to mitigate these dangerous flows, while  maintaining the efficacy of the barrier at blocking lamprey. To do this the existing flow  must be first studied to better understand the flow behavior and to allow quantification of  drowning risk at the site.  Scale models of four existing barriers (Salmon River, Wolf Creek,  Duffins Creek, and Little Otter barriers) and will be tested in a laboratory flume to evaluate  the flow behavior at the structures.  Flow visualization will be first used to identify the  conditions of flow when a dangerous submerged hydraulic jump forms.  Then, detailed  flow measurements will be made of these flows using an Acoustic Doppler Velocimeter.   After gaining a better appreciation of flow at the structures, a retrofit design for barriers  will be developed that results in mitigation of the potentially dangerous flow features,  while maintaining the necessary vertical drop between the dam crest and tailwater to block  lamprey migration.  This retrofit design will then be tested in the laboratory flume to  assess the improvement in drowning risk.  

In progress
Start Date
End Date
Scope of Study
Laboratory Investigation
Scale of Phenomena
Annex Numbers
Research & Development
Surveillance and Monitoring
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats

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