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- W4292242807 abstract "Abstract The Trinity River in northern California was adjusting to unregulated flood and mining impacts when it was dammed and flow regulation began in 1960. We examine the subsequent evolution of the river's alluvial channel through 60 years of increases in regulated mainstem flow regimes in an unconfined and confined valley where Rush and Indian creeks respectively join the river 6.9 and 26.7 river kilometres from Lewiston Dam. The resulting capacity of the tributary junctions for rearing Chinook salmon fry in the current flow regime is evaluated with an empirical model developed for the Trinity River. Results indicate that morphologic changes at Indian Creek were relatively minor after damming because mainstem flows were restricted to a narrow channel in comparison to the channel at Rush Creek. Conversely, active channel and bar areas significantly declined at Rush Creek because the mainstem sediment supply was more severely reduced by flow regulation that enabled riparian vegetation to colonize the expansive alluvial surfaces that were present. These changes reduced instream habitat, suggesting salmon populations in large valleys may be at higher risk below dams than in smaller valleys where the reduced flow is confined to an already narrow channel. However, the relatively wide and unconfined valley responded more positively to increases in flow and sediment through the regulatory periods to yield significantly higher capacities for rearing Chinook fry. Therefore, while unconfined reaches may be particularly susceptible to change when a river is dammed, they may also provide the greatest opportunity for restoration of salmon populations." @default.
- W4292242807 created "2022-08-19" @default.
- W4292242807 creator A5038480778 @default.
- W4292242807 creator A5047976258 @default.
- W4292242807 date "2022-09-06" @default.
- W4292242807 modified "2023-10-14" @default.
- W4292242807 title "Evolution of tributary junctions and their capacity for rearing juvenile Chinook salmon (<scp><i>Oncorhynchus tshawytscha</i></scp>) on a regulated river" @default.
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- W4292242807 doi "https://doi.org/10.1002/eco.2463" @default.
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