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Accession Number DE2013-1062603
Title Optimizing River Flows for Salmon and Energy.
Publication Date Oct 2012
Media Count 24p
Personal Author B. Smith H. I. Jager R. Martinez
Abstract This study identified trade-offs and complementarities between seasonal flow regimes that favor energy producers and those that benefit salmon production in the Tuolumne River, California below Don Pedro Dam. We produced and analyzed a non-dominated set of solutions using two models, one to estimate relative energy value and one to estimate relative salmon production from candidate flow regimes. The analysis suggested that both salmon and energy producers benefitted from pulse-flow releases during hot summer temperatures. However, the timing of an earlier pulse flow differed substantially between optimal flow regimes favoring the two objectives. Earlier flow releases that favored salmon production were allocated in late-winter over an extended period. This broad late-winter pulse inundated floodplain and promoted faster juvenile growth for early cohorts, whereas the later pulse flow mitigated exposure to high river temperatures by later cohorts of juvenile salmon. Optimal minimum flows were also higher in salmon-oriented solutions than in those that favored energy value. Flow releases allocated to maximize energy value occurred in both summer and winter, when cooling and heating increased electricity demand. Intermediate solutions generally allocated steeper and narrow pulses both in summer and during the late-winter, at times mirroring those used by salmon regimes. The steepness of pulse flows to maximize energy was driven primarily by hydraulic capacity (maximum generating flows). In summary, this analysis has improved understanding of the trade-offs and complementarities between seasonal patterns of reservoir releases that favor salmon and those that favor energy value to producers.
Keywords Algorithms
Hydroelectric power plants
Optimal flow
Seasonal variations
Temperature effects

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 98F - Fisheries & Aquaculture
68D - Water Pollution & Control
50B - Civil Engineering
Corporate Author Oak Ridge National Lab., TN.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1403
Contract Number DE-AC05-00OR22725

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