Concurrent Sessions D: Fish Passage at Tidal Barriers - Practical Considerations for Fish Passage Tide Gates
Location
Agriculture Science Theater, Oregon State University
Start Date
25-6-2013 4:30 PM
End Date
25-6-2013 4:50 PM
Description
Tide gates serve an important role in drainage and maintenance of low-lying estuarine environments for agricultural and urban development. However, the benefits of a properly functioning traditional-style tide gate are contrasted by its reduction of aquatic and terrestrial species habitat. Where water would naturally ebb and flow in and out of estuaries, tidal marshes, and low-lying coastal streams and tributaries, the tide gate effectively cuts off this important interaction between fresh-water and salt water and significantly reduces aquatic species opportunity to migrate between coastal and upland environments. In recent years, new designs for tide gates have emerged, that not only maintain focus on flood risk reduction for reclaimed lands, but also improve fresh-water and salt water interaction as well as maximize opportunities for aquatic species to migrate. The new tide gate designs provide much more flexibility for meeting habitat targets, while minimizing flood risk, however, they pose a significant challenge to the hydraulic analysis, design, and construction aspects. The presentation will discuss challenges posed to the design and construction team, and will offer practical considerations and guidelines from hydraulic design to installation. Focus will be paid to the difficulties of numerical modeling of complex tide gate operations, as well as permitting challenges. Finally, construction and installation techniques will be discussed.
Concurrent Sessions D: Fish Passage at Tidal Barriers - Practical Considerations for Fish Passage Tide Gates
Agriculture Science Theater, Oregon State University
Tide gates serve an important role in drainage and maintenance of low-lying estuarine environments for agricultural and urban development. However, the benefits of a properly functioning traditional-style tide gate are contrasted by its reduction of aquatic and terrestrial species habitat. Where water would naturally ebb and flow in and out of estuaries, tidal marshes, and low-lying coastal streams and tributaries, the tide gate effectively cuts off this important interaction between fresh-water and salt water and significantly reduces aquatic species opportunity to migrate between coastal and upland environments. In recent years, new designs for tide gates have emerged, that not only maintain focus on flood risk reduction for reclaimed lands, but also improve fresh-water and salt water interaction as well as maximize opportunities for aquatic species to migrate. The new tide gate designs provide much more flexibility for meeting habitat targets, while minimizing flood risk, however, they pose a significant challenge to the hydraulic analysis, design, and construction aspects. The presentation will discuss challenges posed to the design and construction team, and will offer practical considerations and guidelines from hydraulic design to installation. Focus will be paid to the difficulties of numerical modeling of complex tide gate operations, as well as permitting challenges. Finally, construction and installation techniques will be discussed.