Channel narrowing on the upper Green River of Utah and Colorado in Dinosaur National Monument has occurred through the deposition of inset floodplains. Flaming Gorge Dam (FGD) began regulation immediately after a big flood, which had vertically accreted active bars in the channel and banks. The large reduction in annual peak flows after closure of FGD abandoned these surfaces, shifting these deposits from active channel to floodplain. Following dam closure, large floods became more infrequent, allowing lower elevation floodplains to aggrade within the pre-dam channel. These surfaces were vegetated and stable when bypass flooding during the 1980's deposited up to 90 cm of sediment, raising the elevation of the floodplains beyond the post-dam active hydrologic environment. The overall sand storage condition in Lodore Canyon has not changed since the large floods of the 1980's, and recent bypass flooding has done little to reverse narrowing or re-activate stable floodplain deposits.
|Advisor:||Schmidt, John C.|
|School:||Utah State University|
|School Location:||United States -- Utah|
|Source:||MAI 46/05M, Masters Abstracts International|
|Subjects:||Geography, Hydrology, Environmental science|
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