Multi-objective optimal design of interbasin water transfers: The Tagus-Segura aqueduct (Spain)



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Valerio, Carlotta and Giuliani, Matteo and Castelletti, Andrea and Garrido, Alberto and De Stefano, Lucia (2023) Multi-objective optimal design of interbasin water transfers: The Tagus-Segura aqueduct (Spain). Journal of Hydrology Regional Studies, 46 (101339). ISSN 2214-5818

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Study region
The Tagus-Segura aqueduct (TSA) is a large and strategic water transfer scheme in Spain that connects Entrepeñas and Buendía reservoirs in the Tagus river headwaters to the Segura river basin, a highly stressed Mediterranean area.

Study focus
The operating rules of the TSA underwent several modifications over the years, and the debate about which are the optimal parameters to meet the interests of the parties involved is still open. We employed Evolutionary Multi-Objective Direct Policy Search to jointly optimize the re-operation of the headwaters dams and the water transfer policy with respect to four conflicting objectives: Tagus and Segura water demands, hydropower production and socioeconomic benefit of the population living on the shores of the headwaters reservoirs. We tested the optimization under the baseline and the 2027 scenario, which foresees an increased environmental flow (EF) in the Tagus river.

New hydrological insights for the region
The proposed operating rule presents optimized control parameters, a higher degree of freedom and a transferred volume that cyclically varies according to the hydrological stage of the year. In the 2027 scenario, despite the increased EF, the deficit in the aqueduct shows a limited increase compared to the historical solution (+10%), while the storage deficit is strongly reduced (−73%). This benefits the population living on the reservoirs shores and also ensures more stability to the aqueduct functioning.

Item Type:Article
Uncontrolled Keywords:Interbasin water transfer, Tagus-Segura aqueduct, Multi-objective evolutionary optimization, Direct policy search, Environmental flow
Subjects:Sciences > Geology > Hidrology
ID Code:77062
Deposited On:21 Mar 2023 19:07
Last Modified:22 Mar 2023 08:56

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