Impacts of the Jordanelle Dam on the hydrology and sedimentology of the Provo River: continued downstream adjustment

Non-EPSCoR Presenters: 
Adriana Martinez
Type of Presentation: 
Thu, 2018/04/12
What is the name of the event (if any) where you presented?: 
Association of American Geographers Annual Meeting, New Orleans, LA
Please enter a brief description of your presentation.: 

Large dams alter flow and sediment transport, which can result in changes in stream morphology and, therefore, habitat downstream of the impoundment. Because the Jordanelle Dam on the Provo River, Utah, was constructed relatively recently (1992), the river is likely still undergoing changes downstream of the Dam and Reservoir. Thus, it provides an opportunity for monitoring that can give insight into understanding ongoing sedimentation adjustments post-dam. Gravels below the dam are generally larger, and more sorted and symmetrical, reflecting both reduced flows and influx of in-reach sediments (never channelized reach). Gravels (D50) are still capable of entrainment (based on τcr) at our study sites, possibly due to existing gravel supply. Contributing factors to reduced entrainment at three sites include low slope, meanders, and/or multiple channels over a wide area. Management of dams and dam impacts has improved in the last decade via environmental flows, restoration and rehabilitation, and invasive species mitigation. Following restoration (2006), monitoring is needed as the river continues to adjust to inform future management of this system.