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Trade-Offs between phosphorous discharge and hydropower production using reservoir regulation
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering.ORCID iD: 0000-0003-4036-424X
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering.
2017 (English)In: Journal of water resources planning and management, ISSN 0733-9496, E-ISSN 1943-5452, Vol. 143, no 9, article id 04017052Article in journal (Refereed) Published
Abstract [en]

The management of water flow using reservoirs for the purpose of hydropower production can have significant impacts on solute transport. Reducing the phosphorous load to downstream areas can be of great importance for aquatic habitats associated with recipient waters, as well as for the overall health of coastal and estuary areas. This study demonstrates a combined operation of a network of reservoirs with the objectives of hydropower production and improvement of water quality in downstream areas using a multiobjective approach and incorporating the transport of phosphorous in the watershed. A genetic optimization method was used to determine the trade-off between power production and mitigation of phosphorous discharge in the reservoir network of the Dalälven River, Sweden. The phosphorous export can be reduced (-5%) with a limited loss of power production (-4.3%), but further reduction is associated with a significant loss in total power production. The trade-off between the two objectives is determined using Pareto diagrams and examined for varying particulate conditions.

Place, publisher, year, edition, pages
American Society of Civil Engineers (ASCE), 2017. Vol. 143, no 9, article id 04017052
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-201608DOI: 10.1061/(ASCE)WR.1943-5452.0000809ISI: 000408564100005Scopus ID: 2-s2.0-85021354663OAI: oai:DiVA.org:kth-201608DiVA, id: diva2:1073344
Note

QC 20170214

Available from: 2017-02-10 Created: 2017-02-10 Last updated: 2017-09-27Bibliographically approved
In thesis
1. Effects of Watershed Dynamics on Water Reservoir Operation Planning: Considering the Dynamic Effects of Streamflow in Hydropower Operation
Open this publication in new window or tab >>Effects of Watershed Dynamics on Water Reservoir Operation Planning: Considering the Dynamic Effects of Streamflow in Hydropower Operation
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Water reservoirs are used to regulate river discharge for a variety of reasons, such as flood mitigation, water availability for irrigation, municipal consumption and power production purposes. Recent efforts to increase the amount of renewable power production have seen an increase in intermittent climate-variable power production due to wind and solar power production. The additional variable energy production has increased the need for regulating the capacity of the electrical system, to which hydropower production is a significant contributor. The hydraulic impact on the time lags of flows between production stations have often largely been ignored in optimization planning models in favor of computational efficiency and simplicity. In this thesis, the hydrodynamics in the stream network connecting managed reservoirs were described using the kinematic-diffusive wave (KD) equation, which was implemented in optimization schemes to illustrate the effects of wave diffusion in flow stretches on the resulting production schedule. The effect of wave diffusion within a watershed on the variance of the discharge hydrograph within a river network was also analyzed using a spectral approach, illustrating that wave diffusion increases the variance of the hydrograph while the regulation of reservoirs generally increases the variance of the hydrograph over primarily short periods. Although stream hydrodynamics can increase the potential regulation capacity, the total capacity for power regulation in the Swedish reservoir system also depends significantly on the variability in climatic variables. Alternative formulations of the environmental objectives, which are often imposed as hard constraints on discharge, were further examined. The trade-off between the objectives of hydropower production and improvement of water quality in downstream areas was examined to potentially improve the ecological and aquatic environments and the regulation capacity of the network of reservoirs.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 70
Series
TRITA-HYD ; 2017:01
Keywords
reservoir operation, dispersion processes, wave diffusion, multi-objective operation, water resource management, discharge variability, power spectrum analysis
National Category
Water Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-201612 (URN)978-91-7729-278-4 (ISBN)
Public defence
2017-03-03, F3, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note

QC 20170210

Available from: 2017-02-10 Created: 2017-02-10 Last updated: 2017-02-10Bibliographically approved

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Zmijewski, Nicholas

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